| 考虑泥沙冲淤对水流控制方程的改进与模拟 |
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| 引用本文： | 崔占峰,张小峰,冯小香,谢作涛.考虑泥沙冲淤对水流控制方程的改进与模拟[J].水科学进展,2006,17(2):235-241. |
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| 作者姓名： | 崔占峰 张小峰 冯小香 谢作涛 |
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| 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, 湖北, 武汉, 430072 |
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| 摘 要： | 以一维数学模型为例,通过数值实验及渭河实际资料的验证,发现在含沙量较大的情况下,水流连续方程里的浑水与床面的交换项对流量影响是明显的,计算中应予考虑.解释了在像黄河这样的多沙河流中存在的“水变沙”、“沙变水”的现象.由此可见,在模拟含沙量较大河流的水沙数学模型中,应完整考虑水流连续方程的微元河段的水量变化率、进出通量变化及浑水与床面的交换通量这三项.
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| 关 键 词： | 水流控制方程 高含沙 浑水连续方程 数值试验 数学模型 |
| 文章编号： | 1001-6791（2006）02-0235-07 |
| 收稿时间： | 2005-01-05 |
| 修稿时间： | 2005-06-30 |
Modification of water continuity equation considering the exchange flux between sediment laden flow and bed |
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| CUI Zhan-feng,ZHANG Xiao-feng,FENG Xiao-xiang,XIE Zuo-tao.Modification of water continuity equation considering the exchange flux between sediment laden flow and bed[J].Advances in Water Science,2006,17(2):235-241. |
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| Authors: | CUI Zhan-feng ZHANG Xiao-feng FENG Xiao-xiang XIE Zuo-tao |
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| Affiliation: | State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China |
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| Abstract: | In the sediment mathematical model, three compossitions of the flow should be included in the continuity equation: the volume flow rate of a control volume,the volume flow rate in and out the control volume and the exchange flux between sediment laden flow and bed.Now,the exchange term between sediment laden flow and bed is not be considered in the flow continuity equation in most sediments mathematical models.One dimension-mathematical model is taken as an example to evaluate the importance of the exchange term with the numerical experiments.Based on the schematic model and the field data of the Weihe River,the research results show that the exchange term has obvious influence on discharge when sediment concentration is high.The phenomenon of the so-called'change flow into bed material' or'change bed material into flow',which(often) occurs in the sediment-laden river like the Yellow River,can be explained.The conclusion can be made when the sediment concentration is high.The three compositions of the equation of continuity of flow should be synthetically considered in the water and sediment mathematics model. |
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| Keywords: | water continuity equation hyperconcentrated sediment-laden flow equation of continuity of sediment laden flow numerical experiment mathematical model |
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