Silting thickness analysis of regular desilting in rectangular and trapezoidal channel

Silting in river is a dynamic process, so it needs to regular desilting. At present, underwater siltation monitoring still its early days and based on experience. This paper puts forward the criterion of discrimination, which flood discharge section decreased by 20%. It used method steady uniform flow open rectangular trapezoidal channel for calculation. The results show that reference values dredging thickness different forms were determined. Siltation thicknesses are linearly related water depth. And reduction rate has quadratic function relation with silting thicknesses. They proportional width their rates trended mitigation when bottom depth constant. In addition, value should be determined combining width, surface other actual situation.