摘要
为提高城市小流域降雨径流计算方法的一致性,基于城市小流域水文基础理论,分析了推理公式法与SWMM运动波法计算地表径流量的异同,提出了涉及土壤类型、设计降雨强度及不透水面积比的体积径流系数推求方法。以北京为应用实例,利用提出的方法推求体积径流系数,代入推理公式计算了北京暴雨径流峰值流量,并与SWMM的计算结果进行对比。结果表明:在降雨和水文损失时空分布均匀的假设下,推理公式法是运动波法的特例,体积径流系数与雨量径流系数概念一致,与流量径流系数在数值上相等;基于体积径流系数,利用推理公式计算得到的北京暴雨径流峰值流量与SWMM计算结果具有较高的一致性。
To improve the consistency of rainfall runoff calculation methods in urban small catchments,based on the hydrological basic theory of urban small catchments,the similarities and differences between the rational formula method and the SWMM motion wave method for calculating surface runoff were analyzed.A volume-based runoff coefficient calculation method involving soil type,design rainfall intensity,and impermeable area ratio was proposed.A case study was carried out in Beijing.The proposed method was used to calculate the volume-based runoff coefficient,which was taken into the rational formula to calculate the peak flow of rainstorm runoff,and compared with the calculation results of SWMM.The results indicate that under the assumption of uniform spatiotemporal distribution of rainfall and hydrological losses,the rational formula method is a special case of the motion wave method.The concept of volume-based runoff coefficient is consistent with that of rainfall runoff coefficient,and is numerically equal to that of flow runoff coefficient.Based on the volume-based runoff coefficient,the peak flow of rainstorm runoff in Beijing calculated by the rational formula has a high consistency with the SWMM calculation results.
作者
王文亮
苏成庆
尹佳伟
田晓霞
郭纯园
李俊奇
WANG Wenliang;SU Chengqing;YIN Jiawei;TIAN Xiaoxia;GUO Chunyuan;LI Junqi(Key Laboratory of Urban Stormwater System and Water Environment,Ministry of Education,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Department of Civil Engineering,University of Colorado,Denver 80217,USA)
出处
《水资源保护》
北大核心
2025年第6期28-33,共6页
Water Resources Protection
基金
国家重点研发计划项目(2021YFC3200700)
北京市属高等学校高水平科研创新团队建设支持计划项目(BPHR20220108)。
关键词
城市小流域
体积径流系数
推理公式法
SWMM
运动波法
urban small catchment
volume-based runoff coefficient
rational formula method
SWMM
kinematic wave method
