窟野河水流输沙特性及河道对泥沙调蓄作用的研究

Sediment Transport Characteristics and Reservior Action of River Course on Sediment in Kuye River

根据窟野河各水文站实测资料,分析了各站的水沙关系,水流泥沙因子的非均匀性、不恒定性对输沙特性的影响以及粗泥沙高含沙水流的挟沙力等。在此基础上建立了一维非恒定流泥沙数字模型,并用大洪水资料进行了验证。进一步得出,窟野河的粗泥沙除小洪水淤积和风沙沉积外,其中还有一部分是洪水冲刷河床中的淤沙形成的,因此,各级沟道不仅是输沙的通道,也是调节泥沙的沙库。

Based on data obtained at each hydrologic station on Kuye river,analyses have been conducted on the relationship of runoff to coming sediment,the non-uniform of sediment size and unsteady of flood influence on the sediment transport characteristic,and the carrying capacity of a flow at hyperconcentration of coarse sediment.On this basis,a one-dementional sediment mathe- matic model for a unsteady flow is established,and it has been tested with data of three heavy floods.In further study, it is found that besides sedimentation in light flood and blown sand,the coarse sediments in Kuye river is produced from scouring of deposited sediments on bed during flood season.From the matter of that,we know each level of a river course not only serves as a water way for sediment transport,but also a sediment regulation reservoir.