考虑底坡的异重流倒灌流量计算公式

发布时间：2018-02-02 20:42

  本文关键词： 异重流 支流 倒灌流量 底坡 小浪底水库　出处：《泥沙研究》2017年01期 　论文类型：期刊论文

【摘要】：水库异重流倒灌是造成支流淤积的重要原因,影响支流库容可持续利用。已有的异重流倒灌流量公式在推导过程中均假设支流底坡为0,所计算的倒灌流量往往大于实测值。本文通过在倒灌异重流的动量方程中加入底坡上的压力,推导了考虑底坡的异重流倒灌流量公式。公式结构形式表明在相同的口门浑水厚度与含沙量条件下,倒灌流量随底坡增加而减小。使用小浪底水库4条支流的异重流测验数据对公式进行了验证。验证结果表明相对于不考虑底坡的倒灌流量公式,本文提出的公式计算精度更高。
[Abstract]:Gravity flow reverse irrigation is an important reason for the deposition of tributaries, which affects the sustainable utilization of tributaries. In the derivation process, the existing formulas of gravity flow backflow flow flow assume that the bottom slope of the tributaries is 0. The calculated flow rate is usually larger than the measured value. In this paper, the pressure on the bottom slope is added to the momentum equation of the gravity current. In this paper, the formula of gravity flow reverse irrigation flow considering bottom slope is derived. The formula structure shows that under the same conditions of muddy water thickness and sediment content at the same entrance. The formula is verified by using the density current test data of four tributaries of Xiaolangdi Reservoir. The results show that the formula is relative to that without considering the bottom slope. The formula presented in this paper has higher accuracy.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;黄河勘测规划设计有限公司;黄河水利科学研究院;
【基金】：国家自然科学基金资助项目(51379156,51309110) 水利部公益性行业科研专项经费资助项目(201401023) 黄河水利科学研究院中央级公益性科研院所科研业务费专项(HKY-JBYW-2014-01)
【分类号】：TV145.2
【正文快照】： 当库区干流水体的含沙量大于支流时,干流水体会以异重流的形式倒灌入支流。异重流倒灌造成的危害有很多,如水库内干支流交汇处发生的倒灌,容易形成倒锥体淤积,严重时形成拦门沙坎导致支流库容损失[1,2]。官厅水库的支流妫水河,其拦门沙坎高程从20世纪80年代中期的469m不断淤高，

本文编号：1485425