摘要
流域各点流速的计算对流域汇流有着重要的影响,提出考虑雨强的曼宁公式计算方法,构建空间流速场,使汇流计算更加精确。该计算方法充分考虑了地形地貌、水力条件以及降雨强度对流速的影响,对比于曼宁公式计算方法,其计算条件更趋于实际情况。通过流速计算构建出的空间流速场,推导流域汇流时间概率密度分布函数即地貌瞬时单位线,将其应用于万泉河水系内定安河流域,结果表明考虑雨强的曼宁公式计算方法推求出的洪水过程线优于曼宁公式计算方法。
The calculation of flow velocity at each point in the basin has an important influence on the basin confluence. A calculation method of Manning formula considering rainfall intensity is proposed to construct the spatial velocity field so as to make the calculation of confluence more accurate. The calculation method considering the topography,hydraulic conditions and the influence of rainfall intensity on velocity,the comparative calculation method of Manning Formula,the calculation condition is more practical. Based on the spatial velocity field constructed by velocity calculation,the time probability density distribution function of watershed confluence,i. e. the geo-morphological instantaneous unit line,is deduced and applied to the Dingan River Basin in Wanquan River System. The results show that the flood process line calculated by the Manning Formula considering the rainfall intensity is better than that calculated by the Manning Formula.
作者
谢志刚
石朋
纪小敏
赵兰兰
瞿思敏
崔彦萍
XIE Zhi gang;SHI Peng;JI Xiao min;ZHAO Lan lan;QU Si min;CUI Yan ping(College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China;State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098,China;Jiangsu Provincial Hydrology and Water Resources Investigation Bureau, Nanjing 210029, China;Bureau of Hydrology, MWR, Beijing 100053, China)
出处
《中国农村水利水电》
北大核心
2019年第6期6-9,共4页
China Rural Water and Hydropower
基金
国家重点研发计划项目(2017YFC0405601)
国家自然科学基金项目(51479062,41730750)
关键词
空间流速场
地貌瞬时单位线(GIUH)
雨强
曼宁公式
汇流时间
spatial velocity field
geomorphic instantaneous unit hydrograph(GIUH)
rainfall intensity
Manning formula
confluence time
