摘要
小开河引黄灌区运行10 a,输沙干渠基本处于冲淤平衡,未进行过大面积清淤,实现了泥沙长距离输运的前期设计目标。引水引沙条件、渠道边界条件,支渠与沉沙池运行情况均是影响小开河灌区泥沙长距离输运的主要因素;加大引水流量,降低引水含沙量,合理调整渠道断面形态,减小渠道糙率,科学调控支渠、沉沙池运行状况,均是提高灌区输沙干渠水流挟沙能力,保障灌区泥沙长距离输运和持续运行的有效措施。
During ten years of operation, the main canals of Xiaokaihe Irrigation District remained the equilibrium position of aggradation and degradation approximately, that meant no large area of dredging took place, the purpose of the long distant sediment transport was obtained, and the key elements effecting on the long distant sediment transport were discharge, sediment concentration, channel condition, and operations of the branch canals and setting sand basin. Discharge increasing, sediment concentration decreasing, geometry of canal regulating properly, water flow resistance decreasing, branch operation and the settling sand basin operation scientifically, these all are the effective measures and methods to enhance the transporting sand capacity of the flow and maintain the continuance operation of the long distant transporting sand in the irrigation district.
出处
《水利科技与经济》
2009年第3期189-190,共2页
Water Conservancy Science and Technology and Economy
基金
科技部公益专项项目(2004DIB4J169)
国家自然科学基金项目(50609032)
水利部科技创新项目(SCX2007-02)
关键词
泥沙长距离输运
实践
原因
黄河三角洲
小开河灌区
long distant transport sand
practice
reasons
Yellow River Delta
Xiaokaihe Irrigation District
