摘要
HEC—RAS（RiverAnalysisSystem）模型是由美国陆军工程师团开发的模型软件之一，采用此软件进行水库回水计算时，对摩阻比降的计算方式有多种选择，经研究探讨可以看出，根据不同的摩阻比降计算方式，计算的成果有可能差异较大，设计人员宜在糙率率定及回水计算中采用同一方式，以保证成果的统一及合理性；同时应根据适用条件选定合理的计算方式。
HEC - RAS model is one of the prototype software developed by the United States Army Corps of Engi- neers. When reservoir backwater is calculated by using the software, various calculation methods of friction gradient can be selected. The study shows that various calculation methods will obtain different calculation results. It is suit- able for designer to use the same method in the roughness coefficient and backwater calculation so to ensure the uni- ty and reasonableness of calculation results. At the same time, the reasonable calculation method is selected ac- cording to the suitable conditions.
关键词
水库淹没
摩阻比降
流量模数
回水计算
reservoir inundation
friction gradient
discharge modulus
backwater calculation
