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 · Sand mining, especially when done without regulation or oversight, can damage rivers, cause beach erosion and destroy coastal ecosystems. At .

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 · Here we report the environmental effects of river sand mining from the small rivers (chment area < 10,000 km 2; Milliman and Syvitski 1992) debouching into the largest marginal lagoon, in the southwest coast of India, the Vembanad lake. These rivers are being subjected to indiscriminate sand extraction over the past 3–4 decades consequent to economic development, rise in foreign ...

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 · Unsustainable sand mining transforms the structure of rivers. By removing more than the river can naturally replace with the sediment it carries downstream, sand mining carves a deeper, narrower bed. This lowers the water level, speeds up flow and erodes banks – reducing the watershed's capacity to absorb excess water during floods. It also impacts biodiversity by .

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Sand Mining Threatens Kashmirs Trout Industry The Third Pole. Aug 18 2020nbsp018332Excessive sand mining can disturb river channels food systems and fish populations It can even alter the riverbed force the river to change course erode banks and lead to flooding Fisheries experts warn that outside contractors reportedly use heavy machinery to extract the minerals destroying fishbreeding ...

 · The impact of sand mining on rivers is exacerbated by the impact of hydropower dams. Along with powering turbines, the reservoirs behind hydropower dams were expected to help control flood peaks – and they have. But dams don't just trap water, they also trap sand and other sediment. Cumulatively, dams are thought to trap 7799% of the natural sediment flows .

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 · Sand mining can kick up silt that smothers fisheries and affect local biodiversity and ecosystems. 8 Meanwhile, the removal of large quantities of sand can accelerate the erosion of riverbanks and coastal areas, undermine bridges, change the flow of rivers, increase the risk of flooding and eliminate buffers against storm surges. 9 10. Sand mining can kick up silt that .