不同植被覆盖流域对不同设计暴雨雨型的响应  

Response of different vegetation cover to different design rainstorm patterns in the watersheds

作　　者：官明虹 王根绪 李尤 GUAN Minghong;WANG Genxu;LI You(Institute of Mountain Hazards and Environment Chinese Academy of Science,Chengdu 610041,China;University of Chinese Academy of Science,Beijing 100049,China;State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所,成都610041 [2]中国科学院大学,北京100049 [3]四川大学水利水电学院/水力学与山区河流开发保护国家重点实验室,成都610065

出　　处：《南水北调与水利科技（中英文）》2022年第1期141-151,共11页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金项目(41790431);中国科学院战略性先导科技专项(XDA23090201)。

摘　　要：为揭示山区不同植被覆盖流域对不同设计暴雨雨型的响应规律,更合理地分析山区暴雨洪水,以四川省大邑、关口、汉王场流域为研究区域,应用时空变源混合产流模型,对在不同重现期设计暴雨雨型条件下的降水在不同植被覆盖的流域上形成的水文过程进行分析。研究结果表明:时空变源混合产流模型在四川省3个流域均具有较好的适用性;四川省大邑、关口、汉王场流域林草植被覆盖率为汉王场>关口>大邑流域,径流系数、平均径流系数、洪峰模数、平均洪峰模数均为大邑>关口>汉王场流域;在不同重现期条件下,径流系数随着暴雨雨型雨峰位置后移而逐渐减小,洪峰模数则不断增大;在不同设计暴雨雨型条件下,随着重现期的不断增大径流系数先增大后逐渐减小而后趋于稳定状态,而洪峰模数则是不断增大。The global warming trend has intensified,increasing the frequency of heavy rain disasters in China,making the mountain watershed easy to produce flash floods.Rain pattern was one of the influencing factors of mountain torrent disaster.Applying the designed rainstorm pattern to watersheds with different vegetation coverage rates in mountainous areas may help to analyze the impact of design rainstorm patterns in different return periods in watersheds.Thus it is important to reveal the response law of different vegetation coverage basins in mountainous areas to different rainstorms,and provide technical support for a more reasonable analysis of mountain rainstorms and floods.The Dayi,Guankou,and Hanwangchang watersheds in Sichuan Province were taken as the study area,and the spatio-temporal variable source mixed runoff generation model was used.The runoff coefficient,flood peak modulus,average runoff coefficient,and average flood peak modulus were used to design rainstorms for different return periods.Analysis of the hydrological process was formed by precipitation under different vegetation coverage in the watershed under different vegetation conditions.In the three small watersheds of Sichuan Province simulated by the spatio-temporal variable source mixed runoff generation model,the simulation accuracy evaluation index values were within the allowable range,indicating that the spatio-temporal variable source mixed runoff generation model was suitable for flood process simulation in small mountain basins.The runoff coefficient and flood peak modulus showed different characteristics under different return periods and different design rainstorm conditions.Under different return period conditions,the rainfall patterns in the basin show a decreasing trend from the front type,the middle type to the rear type,and the flood peak modulus is increasing.Under different rainstorm designs conditions,the runoff coefficient first increases and then decreases slightly and then tends to a stable state under increase of the return

关 键 词：洪水模型 设计暴雨雨型 时空变源混合产流模型 关口流域 汉王场流域 

分 类 号：TV213[水利工程—水文学及水资源] P933[天文地球—自然地理学]