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What is the Yangtze River sand, what harm
Release time:
2023-09-20 15:47
hazards of sand mining in the yangtze river:
The riverbed sand and gravel is the material basis for the stability of the river channel and the balance of water and sand. The sand available for mining is limited every year, and unrestricted and predatory mining of river sand will destroy the river potential of the Yangtze River and the balance of scouring and silting of the Yangtze River bed.
One is to affect the safety of flood control. Excessive sand mining in the river channel causes serious undercutting of the riverbed, forcing banks in deep troughs and cutting feet in rapids, resulting in dangerous sections of the embankment; sand mining near the embankment causes the deep wall to stick to the bank, increasing the relative height of the embankment body and steepening the bank slope, which can easily cause the collapse of the embankment and endanger the safety of the embankment; sand mining near the embankment; mining river sand near water conservancy projects such as culvert gates, pumping stations and bank expansion projects seriously threatens the safe operation and flood control function of these water conservancy projects.
Second, it affects the stability of the river. During the long-term evolution of the river channel, a relatively stable riverbed form is formed through the interaction between the sediment-laden flow and the riverbed. Large-scale and disorderly illegal sand mining has destroyed the riverbed morphology and river regulation project, changed the balance of sediment transport in local river sections, caused local changes in river regime and bank collapse, and adversely affected the stability of river regime in local river sections. If the amount of sand mined indiscriminately is too large, and it is mostly in the main river inflow part and Jiangxin Chau beach, it will cause the river bed to cut down, resulting in the change of river flow potential and the lowering of water level, which will affect the function of hydrological observation and other engineering facilities, reduce the exertion of the original engineering benefits, and seriously affect the overall flood control planning and regional supply, irrigation and drainage system.