Scheduling Weishan Irrigation Water Sand And Sand Basin Sediment Channel Technology Research

Weishan Irrigation District ranks fifth of the six extra large irrigation area the country, it is the biggest Irrigation District of the middle and lower reaches of the Yellow River, which bears the task of Liaocheng360,000hectares of agricultural irrigation, industrial water supply and urban ecology in the development of local economy plays a pivotal role. Also bear the Yellow River to Tianjin, the Yellow River to Hebei two inter-basin water transfer tasks to support the economic construction in Tianjin and Hebei Province.Since Xiaolangdi Reservoir in operation, the Lower Yellow River continued erosion, resulting in bed elevation in the Irrigation District Diversion Irrigation District diversion reduce the water level, reduce the probability of large flow diversion, Weishan Irrigation District summary of the "high water level, big flow" mode of operation is replaced by the low water level, small and medium flow. Analyzing the characteristic of sediment of Irrigation District Channel under different operating conditions, the mechanism of the mode of operation of a variety of water delivery scheduling is researched, To provide technical support in order to expand the way of irrigation scheduling run, efficient operation can compensate for the adverse effects of Xiaolangdi reservoir operation to the irrigation District.Studied by the analysis of the characteristics of the water diversion and sediment concentration in conditions of higher and lower sinking sand pool scour pool sediment erosion and deposition characteristics of the West, settling in the water diversion and sediment concentration conditions in the Weishan Irrigation District run since proposed to the current low diversion sediment concentration conditions is sinking sand pit sediment transport function and sedimentation-channel operation mode and the next higher diversion sediment concentration under the conditions of the settling basin capacity sand functions and dynamic control operation mode. Settling basin run way must have the appropriate engineering measures, regulation at the end of the settling basin facilities. In this paper, systematic observation, analysis and comparison of the effect of sediment channel way to dig until operation mode and the last three years, indicating that the sediment-channel operation mode greatly reduces the settling basin of deposition, can reduce the dredging costs of the irrigation area and The silt secondary treatment burden. Sediment transport channel way to extend the use of settling basin, dredging small pool outside the abandoned sand, a small amount of siltation, proper maintenance can keep the water transfer sediment transport conditions, the overall reduction of sand run effect is very obvious. Depositing sediment pool.dynamic regulation of the operation and optimization of water and sediment scheduling without appropriate engineering measures supporting, therefore, water and sediment to optimize the scheduling mode, have a good run way more than just irrigation district, but must appropriate engineering measures to provide a guarantee to run. Water and sediment mathematical model to calculate the engineering and rehabilitation programs, the results show that simply reduce the elevation of the West, Depositing sediment pool export not effectively reduce the West sediment drainage sedimentation, West sediment drainage-West Depositing sediment pool-General as a system and reduce the export elevation of the main canal, in order to reduce system-wide sediment tour deposition target. Weishan Irrigation District’s sediment control, fundamentally, is to optimize the allocation of irrigation district sediment. The only Implementing many Measures to go on the path of a virtuous circle.