sand mining and impacts on river ecology

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DR. THRIVIKRAMJI K.P. PROFESSOR OF GEOLOGY (Retd.) UNIVERSITY OF KERALA Temple and Pond- Padma theertham- Trivandrum

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Sand mining from river channels and flood plains are carried out fervently to meet the needs of the fine aggregate demand in the construction industry. It has led to the ecological imbalances in the river systems. Alternatively, sand manufactuired by crushing rocks and from the fly ash needs to be progreesively substituted for sand.

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Page 1: Sand Mining and impacts on river ecology

DR. THRIVIKRAMJI K.P.PROFESSOR OF GEOLOGY (Retd.)

UNIVERSITY OF KERALA

Temple and Pond- Padma theertham-Trivandrum

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Noise & Dust Pollution

Scarred Surfaces

Modified water regimes & Stream network

Waste water

Stony waste land

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Build a Green-belt along perimeter of propertywith strip planting of fast growing tree species to reduce large volumes of dust & noiseWetting potential patches of dust with water.Clarify waste water prior to releaseCareful mine planningRestore land to near-natural configurationLocate possible mining areas out of site of

community

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SWM wave setup erodes and destroys beaches. Beach rebuilding in post erosion face lands offshore black sand on the beachesUpgrades black sand content in the newly built beachIRE gathers & Stock-pile sand with power shovels and trucksGathering cannot go below MSLNo drilling, No blasting, No water pollutionBack filling by SWM

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Mining area: Ancient beach/Dune fields

No drilling, No blasting, No water pollution

Shoveled and loaded onto trucks to sand separation plants

Reject sand or gangue goes back to back filling

Abandoned tracts not nearly restorable

Page 9: Sand Mining and impacts on river ecology

Modernisation of Indian SocietyWorld class infrastructure, Modern housing with water and power supply and sanitationInfrastructure: Multi-lane express ways, dedicated-high speed rail tracks and bridgesPorts and harboursModern runways & terminal buildingsSchools, Hospitals & PlaygroundsPower plants, transmission lines, etc .

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Aggregates make 85% of cement concrete

Rail tracks of India consumed 1320.0 billion m3 or 232.0 billion tones of ballast

Maintenance consumes for at least 1/3rd of the above once in three years

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Shelf sand

Manufacture aggregates from overburden and waste of strip and subsurface mines, slag and such other

Reprocess rubble of demolished buildings into aggregates.

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0.25 1.5 or larger

6.5 38.0

0.001 -0.250.025 6.5

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Intrusive rocks, Standard section,Upper continental crust (Wedephol,1969)

Others

Gabbro

Diorite

Quartz diorite

Granodorite

Granite & Quartz monzonite

Abundance, %

Rock type

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Mineral abundance (%),Plutonic Igneous rocks (Wedephol,1969)

0.50.0.80.50.50.5Apatite

243222MagnetiteIlmenite

0.65.--------Olivine

2168------C.pyroxene

2163------O.pyroxene

611212131Amphibole

21--361535P.feldspar

21--2222127Quartz

415663534630Plagioclase

Up.crustGabbroDioriteQ.dioriteG.dioriteGraniteMineral

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3 22

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Road and Rail road network, India (website, GOI)

2,650,000

Rural & other

470,000Major Dist. Roads

128,000State highways

12617Double track66,590National Highways

62195Total track200Express ways

Length, km.Rail roadLength, km

Roads, Types

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Tailing ridge, Kolachel, India

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A talus of rubble readied for the crusher unit, Trivandrum Dist., India

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Partial View of Crusher unit, Trivandrum, India

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Old fashion house- no aggregate in use

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Intensive aggregate use

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A stonewall no aggregate or cement

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Gathered river sand in stock pile

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Sea around India- courtesy National Geographic

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Silent Valley National Park, Grass land and forest stands, Western Ghats -India

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Periyar Valley, WG, India -Reminds Yosemite Valley

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Glacial Boulder Delta, near Syracuse New York

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Interstate 90, Kansas state

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Reptile House, Trivandrum Zoo, India

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Natural History Museum, Trivandrum, Zoo

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Kovalam Palace, Trivandrum, India

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Ballast stock yard, Eraniel, India

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West nada, Fort, Trivandrum, India

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Crusher sand, Suburban Trivandrum, India

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Brick wall using crusher sand, Suburban Trivandrum, India

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Crusher sand used construction, Suburban Trivandrum, India

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Crusher sand used construction, Suburban Trivandrum, India

- a close up

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A modern building using crusher sand, Trivandrum, India

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Another modern building using crusher sand, Trivandrum, India

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Another modern building using crusher sand, Madurai, India

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Temple gopuram- stone work, Madurai, India

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Temple pond - stone work, Madurai, India

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RESERVOIR IN CONTINENTAL SHELF

REGENERATED BY MONSOON WAVES

SAND COLLECTED SANS DRILLING & BLASTING

GEOLOGICALLY EROSION PRONE COAST

IMPLEMENT COASTAL REGULATION ZONE ACT & WELFARE OF DISPLACED FAMILIES

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River turned pond after removal of sand, Tamil Nadu, India

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Black sand & other rubble after Asian Tusnami-Dec.2004

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Black sand & other rubble after Asian Tusnami-Dec. 2004

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Black sand & other rubble after Asian Tusnami-Dec.2004

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Black sand & other rubble after Asian Tusnami-Dec.2004

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Bornhardt and Red sand deposits, foreground, TN, India

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