News
The Necessity of Controlling the Exploitation of River Sand
Release time:
2021-11-09 10:27
1. The need to maintain the stability of the river
In the long-term evolution of the middle and lower reaches of the Yangtze River, a relatively stable riverbed pattern has been formed through the interaction between the sand-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.
2. The need for flood control safety
The middle and lower reaches of the Yangtze River are the focus of flood control, and dikes are the ancient and basic flood control facilities in the middle and lower reaches of the Yangtze River. As the middle and lower reaches of the Yangtze River embankments are built on the Quaternary alluvial plain, and the embankment construction is mostly phased and cultivated, the embankment body soil joint is poor, resulting in poor quality of the embankment body, soil complex, there are still many embankment section is not up to standard.
Indiscriminate mining of river sand will bring more adverse effects on the originally weak embankment project, and its possible impact on flood control safety is mainly as follows: mining of river sand near the river embankment makes the deep bank stick to the bank, the relative height of the embankment increases, the bank slope becomes steep, which easily causes the collapse of the bank and endangers the safety of the embankment; exploitation of river sand near water conservancy projects such as culvert gates, pumping stations and revetment projects seriously threatens the safe operation of water conservancy projects.
3. The need to ensure the safety of navigation
The Yangtze River is a well-developed river in my country's inland waterways. It is a major water channel between Southwest, Central and East China and to the sea. It is called the golden waterway. The middle and lower reaches of the Yangtze River are the golden section of this golden waterway. To ensure the safety of navigation is of great significance to promote the economic and social development of the areas along the Yangtze River.
The impact of indiscriminate mining and excavation on the navigation safety of the Yangtze River is mainly manifested in: crowding out the main channel, prone to sea damage accidents.