sand mining and impacts on river ecology
DESCRIPTION
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.TRANSCRIPT
DR. THRIVIKRAMJI K.P.PROFESSOR OF GEOLOGY (Retd.)
UNIVERSITY OF KERALA
Temple and Pond- Padma theertham-Trivandrum
Noise & Dust Pollution
Scarred Surfaces
Modified water regimes & Stream network
Waste water
Stony waste land
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
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
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
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 .
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
Shelf sand
Manufacture aggregates from overburden and waste of strip and subsurface mines, slag and such other
Reprocess rubble of demolished buildings into aggregates.
0.25 1.5 or larger
6.5 38.0
0.001 -0.250.025 6.5
Intrusive rocks, Standard section,Upper continental crust (Wedephol,1969)
Others
Gabbro
Diorite
Quartz diorite
Granodorite
Granite & Quartz monzonite
Abundance, %
Rock type
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
3 22
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
Tailing ridge, Kolachel, India
A talus of rubble readied for the crusher unit, Trivandrum Dist., India
Partial View of Crusher unit, Trivandrum, India
Old fashion house- no aggregate in use
Intensive aggregate use
A stonewall no aggregate or cement
Gathered river sand in stock pile
Sea around India- courtesy National Geographic
Silent Valley National Park, Grass land and forest stands, Western Ghats -India
Periyar Valley, WG, India -Reminds Yosemite Valley
Glacial Boulder Delta, near Syracuse New York
Interstate 90, Kansas state
Reptile House, Trivandrum Zoo, India
Natural History Museum, Trivandrum, Zoo
Kovalam Palace, Trivandrum, India
Ballast stock yard, Eraniel, India
West nada, Fort, Trivandrum, India
Crusher sand, Suburban Trivandrum, India
Brick wall using crusher sand, Suburban Trivandrum, India
Crusher sand used construction, Suburban Trivandrum, India
Crusher sand used construction, Suburban Trivandrum, India
- a close up
A modern building using crusher sand, Trivandrum, India
Another modern building using crusher sand, Trivandrum, India
Another modern building using crusher sand, Madurai, India
Temple gopuram- stone work, Madurai, India
Temple pond - stone work, Madurai, India
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
River turned pond after removal of sand, Tamil Nadu, India
Black sand & other rubble after Asian Tusnami-Dec.2004
Black sand & other rubble after Asian Tusnami-Dec. 2004
Black sand & other rubble after Asian Tusnami-Dec.2004
Black sand & other rubble after Asian Tusnami-Dec.2004
Bornhardt and Red sand deposits, foreground, TN, India