呼图壁河渠首工程水库泄空冲沙研究

Study on Reservoir Empty-Release Flushing in Headwork of Hutubi River

对于多沙河流上水库的排沙方法,前人已有较多研究,但通过模型试验来模拟水库高淤积后的排沙研究较少。通过水工动床模型试验,对呼图壁河渠首拟建水库高淤积状态下的泄空冲沙进行了研究,根据冲淤前后的断面变化情况,对泄空冲沙过程中的溯源冲刷和沿程冲刷进行了分析,找出了泄空冲沙的规律及运用原则。通过对泥沙冲淤的数值分析,建立了溯源冲沙的概化图形,推导出了一套适合该水库的泄空冲沙公式。经验证,建立的泄空冲沙公式可以用于呼图壁河渠首工程水库排沙形态预测及排沙量的估算。

For sediment river predecessors make a lot of studies on sediment delivery method in reservoir, but it is seldom studied on sedi-ment delivery in highly deposited reservoir by model test. The study of empty-release flushing in high deposition state of the proposed reservoir in headwork of Hutubi River was implemented through hydraulic movable bed model test. According to the sediment variations before and after the flushing, the rules and principles of empty-release flushing were found out by analyzing the retrogressive and on-way erosion in the process of empty-release flushing. The general graphs of retrogressive erosion were established and a set of formulas of empty-release flushing which suited for the resen,oir were deduced by longitudinal numerical analysis of sediment deposition. The results show that the empty-release flushing fomiulas can be used to predict reservoir sediment morphology and estimate sediment in headwork of Hutubi River.