小浪底水库拦沙期黄河引水对河道泥沙输移影响机理探讨

影响河道泥沙输移效率的因素众多,如水沙协调性、泥沙组成、引水规模、河道形态等。引水对河道泥沙输移会造成增淤或减淤,其增减淤量随水沙条件、分流比、河道边界等因素而变化,本文从黄河泥沙输移规律出发,探讨了不同水沙和冲淤条件下,引水规模对黄河冲积性河道泥沙冲淤调整的影响,量化了增(减)淤判数与分流比、泥沙输移比之间的关系。成果对黄河引水方案的科学制定及引水工程的运行调度具有参考价值。

Search mechanism of water diversion influencing sediment transport in Yellow River in sediment storage period of Xiaolangdi Reservoir

Various factors could impact sediment transport of river flow to some extent, such as compatibility of water-sediment flow, sediment grain size composition, water diversion volume, and riverbed morphology. Water diversion can cause deposition increasing and decreasing through changes in river sediment transport, and the volume of such deposition changes depend on factors of water and sediment in the river, water diversion ratio, river boundary, etc. This paper explores the impacts of water diversion on scour and silting in the lower Yellow mainstream under different water-sediment flow conditions and deposition-erosion conditions based on the sediment transport laws, and quantifies the relationship of deposition increasing (decreasing) coefficient versus diversion ratio and sediment transport ratio. The results are useful to design of water diversion schemes and regulation of water diversion facilities in the lower Yellow.