Thursday, August 23, 2018

The recent floods in Kerala has caught attention of the global communities in  the leading nations. BBC weather all along predicted incessant rains for several days in a row. Our mantris never got correct advice. But the chief secretary in an affidavit told the apex court that the opening of shutters in ill famous Mullaperiyar was the reason for the ruins.  The kseb controlled dams shoould have been dewatered by the authorities to get rid of the accumulated water prior to TN opening Mullaperiyar.
Then we as a society least worry about science. Gods and god men are powerless in the fury of nature.
All said and done the balance sheet is devastation of homes built in the flood plains of the rivers in Kerala. Unfortunately no advisor or people wielding  power are ignorant of the scientific under pinnings of the day to day manifestations of natural disasters.
At least the admin will now order a remapping of the flood plains of the rivers. secondly, hopefully while issuing pattas to settlers the lay of the land given pattaya for will be taken into account.

Further it will be interesting to know the counts of lost lives and property in the recent issued patta for people for which both parties contested in issuing pattas.  

Wednesday, February 25, 2015

Scientific Mining Policy, 2014 (Draft)

KERALA SCIENTIFIC MINING POLICY, 2014(Draft)
(Vide:Order No 7037/KSPB/ 13/I&I/SPB Dtd. 26-2-2014)
Introduction
1. As the state enjoys a typical tropical monsoon climate with alternating wet and dry spells, the actual quarrying/ mining (strip or surface) operations are feasible only during the rain free days of the calendar year. 

2a. Kerala has a relatively larger population of 31.8 million (Census 2011). In the gross total area of 38863 km2, the livable and cultivable area is roughly 27,000 km2 and consequently leads to a higher population density. As a result, several parcels of land with potentially minable deposits are under never barren or fallow, but are set apart or already set aside for agricultural/commercial/residential land-uses; in other words, anything but mining related landuse.

This is despite the use of tax revenue in the geo-scientific work of identification, exploration, valuation of mineral/s wealth and delineation ore/mineral bearing land. Sadly, it has been the practice or policy of the administration, to allocate ore/mineral bearing parcels of land to a variety of purposes other than mining and extraction of the valuable mineral wealth.

Recommendation: Therefore, it is strongly recommended that for land parcels with proven mineral wealth the first priority of use or allocation for use shall be for the mining/quarrying of the mineral wealth below the ground. Only after completion of the mining activity and reclamation and landscaping of the mine pit and restoring the surroundings, the land be allocated for other uses.

For example the strip mines of English-India Clays in Akkulam, Thiruvananthapuram are now the home of NCESS, NATPAC, Southern Air Command and so on.

Backdrop of mining in Kerala
Modern quarrying/mining in Kerala is focused on china clays, construction materials (extracted from the shallow skin of the earth’s crust) and the cyclically renewed blacksand beach placer deposits (from the beaches of Kollam and southern part of Alappuzha dist.) on an yearly basis.

The minable deposits of China clay occurrences are localized in the southern districts of Thiruvananthapuram and Kollam and the northern dist of Kannur. The clay mining in Kerala is undertaken by enterprises that are either wholly publicly owned or under private ownership.   

Quarrying/mining operations for rock and byproducts is entirely vested with large and small private investors. In fact, in the immediate preceding decades, the demand for rock rubble and coarse and fine aggregates, showed an unprecedented upward spiral. Being rock rubble and its derivatives, these fetch only a very low unit value.

Contrary to this, the unit value of black-sand placers (or derivatives and separates), accumulating in the modern beaches of Chavara-Kayamkulam-Ambalapuzha section, is huge. This accumulation is cyclical, in that it is systematically annually renewed as a part of the beach building by the long travelled swells associated with the SW monsoon.

2b. In respect of china clay, quarry products and placer minerals varying degrees of value additions of one kind or other are already in place.

Observation:  In the processing plants the ROM china clay goes through an elaborate process of clarification aimed at value addition. The beach placer sand on the other hand goes through a series of process by which the mineral species are separated. Only KMML, TTP Ltd and CMRL are involved in value addition.

 Observation: The proposed Institute for Critical Materials, under the auspices of the KSCSTE and utilizing the monazite as the chief input, has a mission of research, pilot plant operations, incubation and transfer of technology for the commercialization of products.

2c. Without an efficient plan of transporting the finished product or material from the place of manufacture to the potential markets/s,  already at hand, prior to the first day of activity, the profitability of the mining/quarrying enterprise could as well be uncertain.

The road infrastructure in Kerala continues to be insufficient or antique for modern multi-axle lorries or tractor-trailers. The poor upkeep of the single carriage east-west trending roadways that connect points in midland (and low highland?) where value added rock products are manufactured, is indeed a huge bottleneck in the supply chain.  However, the rail transport network, with double-electric-traction lanes is nearly modern in Kerala. 

Recommendation: Therefore the Committee recommends adoption of measures for improving the road infrastructure for the safe passage of heavy duty trucks ferrying products from quarries and mines.

2d. Recycling, brings into an average Keralite’s mind recycling of plastic, glass, paper and other metallic scraps. But recycling in the parlance of mining means entirely different input material.

Recommendation: The scientific mining policy shall encourage, require or make mandatory, the recycling of building rubble from demolition of buildings of all sorts through a suitable manufacturing process, whereby coarse and fine aggregates are manufactured for reuse.

2e.Glass bottles of various descriptions are in plenty in our communities and consequently in our state. If this excellent feed stock is recycled into fine aggregate, to a large extent the scarcity of this commodity in the construction sector can be relived. We need to keep in mind that glass is infinitely recyclable. The committee proposes incentives and encouragements for enterprises and entrepreneurs in the   glass to fine aggregate conversion.

2f. In general, there is no immediate buyer or user of the stockpile of stripped overburden in rock quarries/mines. This overburden is an excellent source material to recover coarse and fine aggregates. Currently such material remains condemned from any further downstream use. It is yet another example of making wealth from waste.

2g. Disposal of unusable stripped waste is not without options. Once the service life of the quarry/mine is reached, the quarried land is recovered by refilling the void with quarry/mine waste and followed by landscaping.
Recommendation: The recovery or reclamation of the quarried/mined land shall be made mandatory and be declared as the responsibility of the mining company.
3. Adopting more technology oriented scientific mining.
In the pre-independence days, i.e., during the days of Raj/Maharaja, mining practice in Travancore state was purely either strip mining or quarrying and minimally mechanized. In place of machines, several types of hand-tools and human labour were intensively used.  
In stockpiling of black sand of placers, gathering of in-stream sand (as fine aggregate), or collecting and washing of lime-shell for subsistence, human (both genders) labor was extensively used. Reasons for the low level of mechanization could have been the dull market demand and plentiful supply of workforce. .
In the post 90’s, a good deal of mechanization has come into the strip mining sector, primarily to raise the output in order to meet the market demand. Machines such as Bulldozers, Powershovels, Jackhammers, dynamite, heavy duty tipper trucks and trained and skilled operators are a common scene in the quarries/mines.  Also used extensively are various sorts of mechanized pumps to dewater the operational area.
Recommendation: The mining sector truly needs use of more machines for capacity expansion, to meet market demand. The mines and quarries currently are one-shift operations. The Government shall encourage adding more shifts in the operations to raise the production to meet the demand from the infrastructure sector of the state.
4. Adoption of most efficient competitive and environmentally responsible method of mining.
The founding of EPA in 1970 in the USA, had set a new road for many nations of the world making them to take a relook at the large and small activities and interventions in the ecosphere of the earth. In 1976, by adding article 48A to the Indian constitution, the wildlife and forests which remained in the state list were transferred to the concurrent list of the constitution.  However, mining and quarrying for minor minerals remained with the state. Regulations and rules framed subsequently by the MoEF governed and ensured the environmental safe guards essential to opening up of a mine to extract major minerals and fuels.

Truly, Mining never was and has been an environment friendly activity in any part of the world at any point of time in the past or in the present.  However, new insights, knowledge, operational methods and modern technologies enabled modern mining to co-exist with a healthy environment and supportive and happy community or society. 

In Kerala, though text book examples of reclamation and reuse of quarry/mine pits exist, these are exceptions and not the rule. For example, the IRE at Kollam has built a township in the backshore, over a parcel of land reclaimed after dredging to recover the valuable black or heavy mineral sand in the backshore.

Secondly at Thonnakkal, Thiruvananthapuram Dist., (on the eastside of NH47 and Asan Memorial), M/s English India Clays Ltd., reclaimed and landscaped their abandoned clay mine (roughly an area = ~15.0 ha) and sold the same to M/s Tata Consultancy Services. Outside of these examples, the reclamation of abandoned quarries and mines continues to be a far-cry.

In spite of the roughly 8000 rock rubble quarries (of which roughly 3000 are abandoned) of variable sizes and depth, recovery or reclamation of the land to the approximate original lay has not happened. This abandon is detested by the society or community in and around the extraction sites and shall not happen anymore now and in the future.

While issuing permit or license for mining or quarrying, the authority shall mandate the operator to backfill, landscape and reclaim the holes created by the extraction. Certainly, this shift in policy and mandating to reclaim and restore the “holed” area back to the near original lay might invite initially very strong objections from the industry. However, such objections will die off with time.

Recommendation: All prospective quarrying/mining operations are subject to a satisfactory clearance based on EIA and SIA stipulations specifically  drawn up by an expert agency or group or institution. The list of expert agencies with latest contact information shall be displayed in the web sites of the Department of Environment and Climate Change, State Biodiversity Board, State Pollution Control Board, The Directorate of Mining and geology  and  KSCSTE.

The final assent or dismissal of request will be vested with the High Power Environment Advisory Committee of the state. However, first or second denial of request can be reviewed for a third time with revised documents on EIA  and SIA.

5. Committee can also look into research and development and human resource development in this sector.

The Central Mining Research Institute, Dhanbad, a member institute of CSIR family, is in charge of developing new technologies, modifying existing technologies and practices in the mining sector of the country. Mining and quarrying cause “high” levels of noise and dust pollution due to drilling, blasting, bulldozers, tippers, and heavy trucks ferrying large volumes of cargo, and neo-sediment laden water discharge outside of quarry limits, and  discharge of oil and grease from the machinery and vehicles.

Recommendation: The State Pollution Control Board shall continue the monitoring of noise and dust pollution from the various sources and stipulate remedial or corrective measures by way of adoption of new technologies or practices instead of   existing systems.

In Kerala, the demand for Geoscientists is met combinedly by at least half a dozen or so colleges plus university departments. But a huge void exists in respect of professionals in areas of Mining Engineering or Applied Geophysics. South of the latitude of Hyderabad, there is no place where one aspirant could earn a degree in Mining Engineering. The Govt. School of Mines, KGF, Karnataka offers a diploma course in Mining Engineering. The scene is a bit better in respect of Applied Geophysics. Below the latitude of Hyderabad, the CUSAT and MS University, Trunelveli are the two places offering a PG course in Applied Geophysics. .

Recommendation: The Committee recommends starting a B.Tech. course in Mining Engineering in the CET, Thiruvananthapuram and a diploma course in Mining Engineering in the Central Polytechnic, Thiruvananthapuram. Also recommended is M.Sc., course in Applied Geophysics, in the Calicut University. The State Planning Board may recommend to the government to allocate adequate funds from AY 2015-16.


6. Adoption of capital and energy saving practices and zero-waste-mining technologies should be identified.
Capital and energy are closely linked. Capital input is essential first step in energy production, whether it is mechanical or electrical. The higher the capital outlay the more efficient is the energy production. The general area of mining or quarrying is one that is highly energy intensive and hence capital intensive. Better energy efficiency in the operations would mean less energy consumption. The proper upkeep of mining machinery (including bulldozers, tippers and trucks), pumps, air compressors and electrical equipments and above all scientific and efficient lighting systems would lead to efficient use of energy. 

On the other hand, zero-waste-mining technologies are in realm of reality. As long as value addition of the strip mining waste is practiced, the bulk of the waste can be sharply reduced to the satisfaction of all.

Recommendation: The quarry waste-->fine aggregate technology is full of promise and the quarry permit issuing authority of the state shall demand inclusion of this technology in the flowchart of operations and at the stage of implementation.

7. Role of government, PSUs and private indigenous and foreign industries should be identified.
The government may involve in mining and quarrying only indirectly. Perhaps government role in this sector shall be one of regulator and not the operator which can be achieved by   putting place appropriate acts and rules. The PSUs are already involved in the core sectors of mining and downstream processing as exemplified by the KMML, TTPL, Clay mining at Madayi and Kundara.

Attracting Indian private capital in this sector is subject to many considerations. New investors will look for a host of concessions and subsidies. The private capital will go to states where   they can maximize their benefits.

Foreign tie ups in the mining sector or fully owned foreign operations are perhaps a pipe dream primarily because of the limited mineral wealth in Kerala.

Recommendation: The Committee could not scope a sector suitable for the foreign private investment in the state.  

8. Labour-industry relation and socio-economic factors should be identified.

Currently Kerala labour market or bank is rife with non-Keralite human resource and in the near future there will be no scarcity of the same. In the quarry industry, large number work men (both semi-skilled and trainable) are engaged in different phases of the operations.
Unlike in the early days of industry, or in the pre-90’s instances of loss of working days due to labour scarcity or unrest is not wide spread. The wages are perhaps decent and comparable to the other sectors of the similar skills. The non-Keralite workers enjoy the work opportunities in the state irrespective of the sector they are in and quarry/mining is no exception. In fact the employability and opportunities in Kerala as well as the social acceptance of the migrant workers perhaps are some of the reasons for the peace and harmony in the work site as well as social life.

Recommendation: First and foremost of all an adhaar based or connected registry of the work force need to be readied to enable the welfare and well being of these workers and payment of wages, and health benefits on time and with legitimacy and transparency.

 9. Environmental management, sustainable quarrying technology and sustainable resource should be given due importance.
As a state, Kerala cannot lag behind the rest of India in upgrading and expanding the infrastructure as well as their up keep at par with the rest of India. In fact the basic inputs like Portland cement and steel can be out sourced nationally or internationally. What is impossible or non-remunerative is sourcing rock rubble and coarse and fine aggregates as well as large block of rock from the neigbouring states. The environmentally sensitive groups in the neighbouring states are more vocal and stronger lobbyist than their peers in Kerala.
Therefore if the vision and mission of the administration is to keep up with the rest of India in respect of the port and harbor infrastructure, repairing or building new seawall, building and repairing of the breakwaters of the fishing harbours from the south to north in coastal Kerala, sustainable quarrying/mining of rock rubble of varying sizes and weights will be indispensable. The state with roughly 1.62 lakh km long roads of different classifications is bound to consume once in 3 to 5 yr, a several km3 of rock material. Then our railways will call for the track upkeep a similar volume of coarse aggregate. The only recourse before the state is sourcing such material from within.

Recommendations:
a.The state shall implement through the various scientific departments a sustainable quarrying/mining policy based on science and technology and not the current “rat-hole” mining/quarrying. Any ban of activities in this domain will only help the deterioration of the quality of infrastructure in the state.

b.Therefore the state shall require the Geological Survey of India to map on ascale of 1:25000 or better and asses the volume of  quarriable basement rock in parts of Kerala but outside the special zones like ESAs or delicate areas for meeting the growing needs of rock rubble and aggregates in the near and mid-future.

c.The Government in future shall not allow any quarrying/mining operation below a  “bench mark” prescribed based on  the floor elevation of a lower order stream draining the watershed in which the proposed quarry or mine will be located. Besides if the EIA and SIA clearance or permissions are earned for the operation or granted for the operation the sustainability also shall be met.   

d.The recommendations of the Committee on reuse of  quarries and mine pits lying with the government be resurrected and points or recommendations drawn up in that report also be utilized in making the quarry/mine operations environment friendly.

e.The vigorous but scientific placer sand mining shall be the declared policy of the state. There is a huge resource of black sand sitting in the sea bed off the Chavara-Ambalapuzha sector in the offshore. Offshore mining however is under the control of the National government. The value and criticality of the offshore or placer mineral wealth to the nation is unintelligible to the lay citizens. However, the government policy shall be couched on the long term benefit to the society as well as the state and nation.

 10. Area of export and import of minerals should be focused.
Import of minerals is sort of a policy in the horizon and is not of immediate relevance as the highest profit is made and is possible if the minerals are value added by refining and manufacturing closer to the site where the mines/quarries are located. The pithead-thermal plants are a case in point, so are the steel mills and zinc smelters now in operation in the country.
.

Recommendation: The export of monazite shall be banned as it is one of those minerals coming under the source of critical materials. In addition, thorium, (a component chemical element in the mineral monazite) has a major role in the nuclear power production if an appropriate technology is developed and commercialized.   

In respect of aggregates and rock rubble of varying dimensions, due to the comparatively low unit value, local sourcing is deemed profitable by the business class or trader and user.

11.A full-scale scientific assessment of the mineral and fuel resources a country is the keystone of the foundation of economic growth, resource management  and scientific utilization of the resources. The UNFC-2009 is a generic scheme wherein the resource quantities are classified based primarily on three specific criteria viz., E, (economic and social viability), F (field project status and feasibility) and G (Geological knowledge) and uses a numerical code making it language free. This proposal or scheme is a valuable infographic that addresses the economic viability, feasibility and geological judgment.  This scheme i.e., UNFC-2009, substitutes a variety of assessment schemes that were in vogue globally so far.  The Geological Survey of India adopted and practices this frame work of assessing the nation’s mineral/ore/fuel wealth.  

Recommendation: The EFG based numerical designation takes into account economic and social aspects in the E axis, while in the F axis is embedded the environmental questions. Therefore knowledge of UNFC-2009 based numerical EFG classification of quarriable and minable resources of the state, be reckoned along with EIA and SIA while granting permission or otherwise for mining/quarrying of a resource.


  


(thrivikramji@gmail.com)

Saturday, October 4, 2014

In 1990, I donated 40 bound volumes of Bull. AAPG

In 1990, I donated 40 bound volumes of Bull. AAPG to the library of Dept. of Geology,  Univ. of Kerala, Kariavattom.

But for the ONGC library in Chennai, the Bulletin of AAPG is practically unheard of in the geoscience libraries in south India. When I earned the Fulbright post-doctoral fellowship in early 1989, I was not only enthused much about the prospect of going back to the US with a research and this time to a Midwestern geoscience department, but also by the chance I might get to extend my research to the area of exact shape analysis.

This technology originated Univ. of Wisconsin, Madison and the geologist-mathematician duo - rather new to the UWM- happened to be the innovators. The story has it that during the welcome party one evening in early Fall at the vice chancellors residence and after downing couple light drinks, the two-person team sat around a tea table and scribbled in a paper towel or back of the envelope the basics of the tool and approach. This algorithm authored by Robert Ehrlich, Bernhard Weinberg was printed in the pages of JSP 1972 as a paper “An Exact Method for Characterization of Grain Shape”.

Later, Prof. Bob Erlich moved to Univ. of South Carolina. I was fascinated by this new tool and corresponded with Bob, about their brain child and asked for help for me to do the exact shape study. And very kindly this man gave me xerox of the step by step tools of the procedure for doing the two D shape study with pencil and divided paper. In the late 1987, the UGC announced PD fellowship to US, I jumped in by applying for the offer through the u of Kerala.

To my great luck, a benevolent mind in the syndicate was in charge of selection at u of Kerala level. The UGC bluntly stated that only two nominations from each university in India will be entertained. Another condition was that the contestants already should have identified a university and a mentor. Luckily then I had Prof. Erlich corresponding with me which enabled me very well as a firm candidate.

One of the preconditions of the award of fellowship also was that the recipient has the burden of lining up a place of work along with a scientist to associate with. I had always in mind the Univ of South Carolina and Prof. Bob Erlich (Bill Full's own advisor for Ph.D), However, Bob turned me over to Bill Full of Wichita State University.

I won the final selection at the UGC but in the meantime I had Bill Full of Wichita state as mentor. This change was ok with UGC as Prof. Bob Erlich himself wrote to UGC and me of the changes of mentor and laboratory.

So I chose to go to the Geology Department at WSU, Wichita. In fact, I landed in the Wichita Airport around 10:00 pm local time on a Monday evening and in the month of Aug. 1989. There was Dr. Bill Full, a boy in the early teens and a woman or the Bills girl friend. For them locating an Asian Indian was no sweat and in fact shouted hey Vick and waved at me.

We boarded the car and drove through the night towards the hosts home. In about an hour we got to the home, where I was supposed to sleep that night. After some snacks and a drink of coke we retired for the night. I had a good nights sleep through the night, and in the morning Bill told me to make myself comfortable in the house and enjoy whatever food that was in the fridge. He was going to the lab in the university, and I may stay back home till he is back. Bill also told me that he has a large dog, and for no reason I be afraid of that animal. In fact the dog was allowed to sniff at me and get my scent for sure.

The same evening, I went to see the room in a condo, along the edge of the campus that Bill identified for me. I felt very much satisfied with the room- one with heating and air conditioning and an indoor swimming pool in the complex. There is a kitchen I might share with another tenant adjacent to my room. Really the kitchen is sandwiched between the rooms. All these for a monthly rent of 600 US Dollars

We went back in Bills car to the home to pick up my two piece luggage and some grocery like milk, cereals, and banana and so on. On our way back we dropped into the Big Mac for a burger dinner. Bill left me in the condo in my room, and I was on my own from that point on wards.

I slept well and deeply. Next morning I was up a bit late like 9 am. After a shower and breakfast, I walked toward the Building that housed geology and geography. A two story building had Geology on the second floor. The building had a basement also which housed some labs.

While I was getting ready to go to India, I casually enquired if there would be some journal that I could carry home a gift or donation. The answer of the HOD was indeed a large yes. He immediately took me to a very large lecture hall kept under lock, opened it for me and announced he would be too happy if I carted off all the journals stacked on the floor.

Well I would disappoint him as I was only looking for Bull AAPG.   And the response was that I blessed him that day by taking away a smaller burden of the department which did not know what to do with all the donations that kept arriving year after year.

Stunningly in the US university system according to a Federal law, any donation of any kind coming off from alumnus cannot be turn down. The story is that when one of the geosciences alumni dies invariably in his will there will be a clear mention of donation of books and journals invariably to the alma mater.

Thus the universities keep accumulating such donations without any known means of disposing the redundant books and journals. Perhaps I did a favor to my friends in the WSU Geology department by agreeing to ship to Geology Department of the University of Kerala 50 volumes (each volume in 12 issues) of Bull AAPG. Certainly I paid like 159 US$ as shipping charge to the US Postal service.

Then on return I got all these volumes red rexin bound before donating it to the Library of the Department of Geology. The glass and steel almirah to store these volumes also was donation from a project fund. Though the almirah with Bull AAPG copies were aptly named, “Prof. K.K.Menon Corner” to my disdain that label was torn off.
                                                            ---------------------
    



Saturday, April 12, 2014

Creating an informed citizenry

In any modern society the responsibility of informing the public about government policies, new issues and solutions, possible solutions etc is with the government and hence the leadership. Take for example the oil and gas price. Every one is under the impression that the govt. is with sort of enmity to the public when it comes to pricing of oil and gas or for that matter the essentials. All political parties and communal groups look at the govt. as enemy number one and blame the govt for everything from price rise to climate change and water scarcity. Any manufacturer and supplier will stay in business as long as he gets his profit share finally. Similar is the case with millions of retailers.
So the price rise is a phenomenon in which the business, clients, buyers importers and such other people need to make a buck.
All are part of the society and the gov. Is forced to play a careful role to satisfy all stake holders, which a bit acrobatic. The was only one country in the world where price rise was unheard off -  the former USSR. I had luck to live in Mo scow for six months in 1986 there was no price rise in the communist system. The fellowship I had was 300 doubles per month. The predoctorals had a fellowship of 100 Robles pm. In 1965 also that was the rate of fellowship which a good friend of mine enjoyed. To quote him "during the last week of every month the foreign students used to check into some city hospital so that they get fed correctly with at least steamed potato"  the hospital crew knew all about it and allowed it. It was one the ways to stave off hunger by the end of the month.

Well that system of govt. is history. So, whether we have grand old party or the substitute party ruling, there will not be any different governance. For reasons we do not like to delve into.

Saturday, August 24, 2013

Edakkal Caves, Wayanad, Kerala


1.    The Edakkal cave is not a cave; instead it is a cove (or a sheltered nook in a cliff face) on the near vertical face of a rocky hill. A typical cave has an entrance created by tens of thousands of dissolution by natural waters and the entrance will lead to a hollow chamber. It is typically formed in limestone terrains only. In the crystalline basement rocks of peninsular India natural caves does not exist as the rock is insoluble practically, in spite of the monsoon rains and water supply.
2.    Edakkal cave is then only a nook or cove in near vertical face of a rock cliff. In fact the “aboriginals” took shelter in such spots and during leisure time got involved in carving and painting the free and clean, algal growth free face with their mental impressions of what they went through daily or whatever.
3.    Obviously the tropical monsoon season with more than 100 t0 140 moist days not only endowed our rocky hills with a universal black coat of dead algae, but made it indelible through decades and centuries and millennia of rain fall.
4.    However by the sheltered nature the nooks on the near vertical face escaped the intense black coat instead the coat ended where the water drops disappeared or escaped by evaporation.
5.    Evaporation is a process that takes place even at the ambient temperature. But the path of the water drops on the roof of the nooks will receive some degree of lichen  growth and to that extent some degree of camouflaging of the details of the lithogyphics  like it happened in the Edakkal cave.
6.    The proposition before us then is the either removal of the pathways of water drops to the roof and/or wall of the cave, or limiting it entirely or completely.   Perhaps this is the only recourse before us now. This process needs to be implemented by doing no harm to the natural setting and perhaps very unobtrusively. This therefore needs very careful analysis of the topographic, climatic and environmental setting of the Edakkal cave.
7.    The orientation of the rock ridge, dominant rocks forming the ridge, their internal structure like joint systems, their depth of penetration, foliation sets, quartz veins and their attitude, and such others need a detailed mapping in a 1:200 or 400 scale and not more, like we do the lithological and structural mapping of a dam site.
8.    A slope map of the ridge, like when we make a plan for landscaping, in a 1:200 or 400 scale needs to be created as an aid in designing a system of sheet flow diversion away from the cliff façade.
9.    Once this is achieved one need to assess the volume of surface water flow over the ridge in all directions to assess, whether or not most of the rain water follows downward through cove or nook face.   Luckily if the major surface run off is away from the nook’s façade then solutions will be far more easier and repair or maintenance more cheap and Affordable in the longer run in the deeper future.
10. If the structural discontinuities in the ridge are proved to be leading water away from the nook, it is a great relief in the refurbishing of the cave and its treasures.
11. This can be proved only by an experiment in the field by a dye test in several selected points on the ridge and during the early or late stages of monsoon. As we do not hold power knowledge about the end of monsoon it is better to do the same during the early days of onset of SW monsoon.
12. This will unequivocally tell us a) there is influx of water into the roof of the nook or not. If the latter is proved true, then we have to implement a host of designed interventions to divert the “gushing” of drops and droplets or micro-sheet flow of water over and through the roof and then over the cave face.
13. Now the next set of experiments is meant to quantify the water volume wetting the roof and face as well as the humidity and temperature in the cave. Once such data are with us and then we could go for a design of diversion measure of the streams of rain drops freely entering the cave roof and then to the face.
14. Remedial measures for avoiding the lichen growth, primarily address the removal of the growth conditions (Lichens are composite organisms consisting of a fungus and a photosynthetic partner growing together in a symbiotic relationship. usually either a photosynthetic green alga or cyanobacterium.)
15. The design shall be construction of micri-gutters across the slope3 of the hill face or side to take the flow off the façade of the cave. The spacing frequency, dimensions etc need to be designed on the basis of knowledge on the quanta of sheet flow down the face. Such solutions are to be based on the actual data and not general presumptions of conjuctures.
16. The Lichen growth and the ambient environment for their healthy growth need to be understood unequivocally to design certain measure that will deflect such conditions for growth and then at the end infestation by lichens.
17.  Therefore, the GoK may order a study to assess the physical and biological environment before a conservation plan is designed for the Edakkal cave – a heritage site that may one day come under the umbrella of UNESCO. 
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 thrivikramji@gmail.com

Wednesday, July 31, 2013

Singing Sands of Sankumukam beach, Trivandrum, India.

Singing Sands of Sankumukam beach, Trivandrum, India.

Singing sands are known to exist in some beaches in different parts of the world. One example near home is the beach sands of Sankumukam, Trivandrum. In fact, the Sankumukam beach sand is near glass quality sand and its black sand component is noticed in the beach immediately to the north of Kovalam headland where the former ITDC hotel complex stands.

Now some points about the singing sands. What is this sand and why is it designated so? Unfortunately, the masonry construction in the backshore to erect a Broad walk, is an intrusion into the natural system. The SW monsoon wave erosion removes practically all the sand stored in the summer berm.

However, when the beach is rebuilt after the monsoon, with a distinct summer berm there is a wide backshore. If one walks over this beach bare footed, and kicking the sand under the feet with the heel an audible squeak is created due to rubbing of the sand by the heel. Such sands are described variously as booming or roaring sands.  In fact, this nature of the sand earned the name singing sand for the beach sand of our own town beach.

What is the source or what are the attributes of this sand that generates an audible squish? According to Sir C V Raman, (who took time out to walk this beach in the early 1950’s, when his flight was delayed by two hours or so and decided to check out this character of the sand in the Sankumukam beach), the moisture content, shape of the sand particles, size and degree of sorting as well as nearly uniform mineralogy, or pure quartz are contributing factors. Sir Raman made this comment to the young geologist, Mr. kVK Nair (then of the Division of Mineral Survey and Research Central Research Institute, the Travancore University) in the presence of Dr. CS Venketeswaran( then Principal, University College, Trivandrum). However, so far an instrumented study of this characteristic never came under scrutiny. The only attribution is that the Sankumukam sand qualifies for designating as glass quality or glass sand like the Chertala Glass sands deposits and makes the audible squeaking sound.


Similar sand occurrences have been reported from other parts of the world, like California and Nevada (dune sands), Kazhakastan, UAE,  Abu Dhabi etc).