HEC-RAS模型在小流域山丘、平原复合型河道水面线推求应用与研究

山丘、平原地区混合地区的河道,产汇流条件复杂,单一计算方法难以有效地模拟河道的洪水情况。以北方小流域的某山丘、平原复合河道为例,基于HEC-RAS模型,在缺乏水文资料的情况下,采用对河道划分山丘、平原区域的方法对河道进行了10年一遇洪水的模拟。结果表明HEC-RAS模型采用山丘、平原区域划分的计算方法与不划分相比较,前者更为符合实际情况。同时,此方法能够适用于流态复杂的河道水面线推求,可为防洪规划与防洪预报提高精度作为参考。

The Application and Study of HEC-RAS Model in Watershed Line of Hilly and Plains Composite Rivers in Small Watersheds

The rivers in the mixed areas of hills and plains have complex conditions of production and flow,and it is difficult to effectively simulate the flooding of rivers by using a single method.Taking a hill and plain compound channel in the small watershed in the north as an example,based on the HEC-RAS model,in the absence of hydrological data,the river channel has been flooded for 10 years.The results show that the HEC-RAS model uses the calculation method of hilly and plains area division compared with the non-division,the former is more in line with actual situations.At the same time,this method can be applied to the river channel line estimation with complex flow regime,which can be used as a reference for improving the precision of flood control planning and flood control prediction.