【作者】 范敏； 周晓岚； 刘士和；

【Author】 FAN Min,ZHOU Xiao-Ian,Liu Shi-he (School of Water Resources and Hydropower,Wuhan University,Wuhan,430072.

【机构】 武汉大学水利水电学院；

【摘要】 淠河具有山区河流径流大、集流快、洪峰高、传播快的特点,洪水运动十分复杂。传统河道一维非恒定流数值计算一般采用特征线法和以Preissmann方法为代表的有限差分法。特征线法计算精度比较高,但受时间步长的限制,用于河道一维非恒定流计算时计算效率却不太高。而Preissmann方法相比特征线法计算效率有所提高,但在求解过程中对特征量的守恒性却没有做出相应要求。为了兼顾数值计算的效率和特征量的守恒,本研究建立了基于有限体积法的河道一维非恒定流数值计算方法,选取淠河洪水实测资料进行验证计算,验证计算成果表明:所采用的方法特征量守恒性较好;洪峰水位、流量的计算值与实测值吻合也较好。最后,采用有限体积法对淠河1991型洪水运动进行计算。更多还原

【Abstract】 Pihe River has a very complicated flow movement,with the mountains rivers’ characteristics of big runoff,fast collecting,high peak and quick spreading.In the traditional 1D numerical simulation of unsteady flow transportation,the characteristic method and the Preissmann method are usually used.It is excellent in keeping the balance of the quantity of water by using the characteristic method;but the computational efficiency need be improved.The Preissmann method which has high computational efficiency,can’t keep the balance of the water quantity.With the strong points of the methods reviewed ahead,a 1D numerical model of unsteady flow based on finite volume method is established.And the floods of Pi he river are used to check the accuracy of the model.The validation results show that the method adopted in this paper does well in the conservation of characters and the calculated values of flood peak and flood elevation agree well with the filed data.Finally,the flood of Pi he River in 1991 is simulated by using the finite volume method.更多还原