黄河上游镫口扬水灌区渠道输沙特性研究

Study on Canal Deposition Characteristics of Dengkou Pumping Irrigation Area on the Upper Yellow River

以黄河上游镫口扬水灌区总干渠为研究对象,研究了引黄渠道泥沙的输移、沉降与悬移特性,分析了含沙量的变化规律及其与各影响因素间的相关性。结果表明:总干渠挟沙力和水流速度、悬移流速及起动流速三者间的关系对含沙量及渠道的冲淤状态有显著影响;含沙量的变化规律具有沿程减小、沿程增大、变化平缓和起伏较大4种状态;含沙量S与各因子相关性由强到弱的排序为流速U、沉速ω、床沙中值粒径D50床、水深h和悬移质中值粒径D50悬,S与U、ω、D50悬均成幂函数关系,与h成线性函数关系,与D50床成指数函数关系。

Regarding Inner Mongolia Dengkou pumping irrigation area of the upper Yellow River main canal as the research object,transport and deposition characteristics of sediment were researched and sediment concentration variation and its correlation with each influence factor were analyzed. It is revealed that the relationship among flow velocity,suspended flow velocity and incipient velocity cause three states of erosion and deposition. Sediment concentration appears four states of evolution with distance which are reduction,increasing,gentle and undulating. The correlation between sediment concentration and some influence factors( velocity of flow/U,depth of water/h,settling velocity/ω,bed-sediment median diameter/D_(50bed)) is studied. Affecting sediment correlation degree factors the range of descending is U,ω,D_(50bed),h and D_(50suspend). S and U,ω,D_(50suspend) shows the power function relationship and h is a linear function and D_(50bed)is exponential function relation.