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Impact Of Sand And Gravel Dredging On The Environment
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For thousands of years, sand and gravel have been used in the construction of roads and buildings. Today, demand for sand and gravel continues to increase. Mining operators, in conjunction with cognizant resource agencies, must work to ensure that sand mining is conducted in a responsible manner.
Excessive in-stream sand-and-gravel mining causes the degradation of rivers. In-stream mining lowers the stream bottom, which may lead to bank erosion. Depletion of sand in the streambed and along coastal areas causes the deepening of rivers and estuaries, and the enlargement of river mouths and coastal inlets. It may also lead to saline-water intrusion from the nearby sea. The effect of mining is compounded by the effect of sea level rise. Any volume of sand exported from streambeds and coastal areas is a loss to the system.
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CHAPTER ONE - [ Total Page(s): 3 ]1.7 DEFINITION OF TERMSDREDGINGDredging
is an excavation activity usually carried out underwater, in shallow
seas or freshwater areas with the purpose of gathering up bottom
sediments and disposing of them at a different location. This technique
is often used to keep waterways navigable. It is also used as a way to
replenish sand on some public beaches, where sand has been lost because
of coastal erosion. Fishing dredges are used as a technique for catching
certain species of edibl ... Continue reading---
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CHAPTER ONE - [ Total Page(s): 3 ]1.7 DEFINITION OF TERMSDREDGINGDredging
is an excavation activity usually carried out underwater, in shallow
seas or freshwater areas with the purpose of gathering up bottom
sediments and disposing of them at a different location. This technique
is often used to keep waterways navigable. It is also used as a way to
replenish sand on some public beaches, where sand has been lost because
of coastal erosion. Fishing dredges are used as a technique for catching
certain species of edibl ... Continue reading---
ABSRACT -- [Total Page(s) 1]
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ABSRACT -- [Total Page(s) 1]
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