Abstract
Silting in river is a dynamic process, so it needs to regular desilting. At present, underwater siltation monitoring is still in its early days and based on experience. This paper puts forward the criterion of discrimination, in which the flood discharge section is decreased by 20%. It used the method of steady uniform flow in open rectangular and trapezoidal channel for calculation. The results show that reference values of dredging thickness in different section forms were determined. Siltation thicknesses of rectangular channel are linearly related to water depth. And the reduction rate of trapezoidal channel has a quadratic function relation with silting thicknesses. They were proportional to channel width and their rates trended to mitigation when the bottom width and flood depth were constant. In addition, the reference value of dredging thickness should be determined by combining with the bottom width, surface width, water depth and other actual situation.
Highlights
In order to meet the needs of modern social development, usually dredging is an effective method to restore river function of flood control, drainage, irrigation, water supply, navigation, and improve the water environment
As you can see from table 1, when the bottom width and river depth are certain, as the river surface width increases, suggestive values of regular desilting thickness are bigger under the flood passage section is reduced by
This paper considered the influence of river sedimentation with different widths and depths. It supposed that the river is straight, and used the method of steady uniform flow in open rectangular and trapezoidal channel for calculation
Summary
In order to meet the needs of modern social development, usually dredging is an effective method to restore river function of flood control, drainage, irrigation, water supply, navigation, and improve the water environment. With the further development of "Beautiful Rivers and Lakes", and better regular desilting mechanism[4], the dredging will become a long-term and important ecological construction work. River regular desilting mechanism mainly stays in the siltation monitoring arrangement, fund preparation, organization management[4-6], etc. Rivers’ flood discharge capacity is in connection with factors such as breadth, depth, slope, bed roughness, bend and so on. In this paper, it was mainly considered the impact of different flood discharge section’s siltation thickness, providing evidence for desilting work, so as to promote the standardized management of rivers and lakes
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