Regulation of riverbed adjustment in the curved reach from Xiongjiazhou to Chenglingji of the Lower Jingjiang River
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Abstract:
After the operation of the Three Gorges Project , the water and sediment process in the downstream of the dam has undergone major adjusted, which has a greater impact on the river bed erosion and deposition of the Xiong jiazhou-Cheng lingji sand-stone-type river section of the Jing jiang River, which may affect the stability , flood control, and navigation of the river in this section. The chang es in water and sediment conditions and their impact on the river bed adjustment procedures were analyzed based on the latest measured data. The research results show that: the runoff of the downstream dam of the Three Gorges reservoir has increased significantly during the dry season, which makes the mainstream of the curve long-term to the convex bank, causing a large erosion of the convex bank, this may be one of the main reasons for the recent occurrence of "squatting and cutting the beach"; with the successive construction and operation of the main and tributary reservoirs in the upperr eaches of the Three Gorges, the rivers downstream of the dam may be subject to long-term cleansing , the typical curved river channel may be in the long-term scouring stage, and the riverbed may have a one-way scouring downward trend, and the main plane of the curved top section may oscillate, Which may be larger, and the top punching point of the curve may also move down correspondingly , and which may cause the distance of the mainstream sticking shore to further defer, causing the collapse of the riverbank line, and the local river potential change is still obvious in the future.
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