城口县降雨径流空间模拟研究  

Spatial Simulation Study of Rainfall Runoff in Chengkou County

作　　者：涂荣誉 林孝松[2] 李宏伟 张吉祥 谢向东 程宏莉 TU Rongyu;LIN Xiaosong;LI Hongwei;ZHANG Jixiang;XIE Xiangdong;CHENG Hongli(School of Smart City,Chongqing Jiaotong University,Chongqing 400074;School of Architecture and Planning,Chongqing Jiaotong University,Chongqing 400074;Meteorological Bureau of Chengkou County,Chengkou Chongqing 405900;Meteorological Bureau of Yunyang County,Yunyang Chongqing 404500;School of Road,Bridge and Construction,Chongqing Transportation Vocational College,Chongqing 402247,China)

机构地区：[1]重庆交通大学智慧城市学院,重庆400074 [2]重庆交通大学建筑与规划学院,重庆400074 [3]重庆市城口县气象局,重庆城口405900 [4]重庆市云阳县气象局,重庆云阳404500 [5]重庆交通职业学院路桥与建筑学院,重庆402247

出　　处：《重庆师范大学学报（自然科学版）》2024年第5期63-73,共11页Journal of Chongqing Normal University:Natural Science

基　　金：国家重点研发计划项目(No.2019YFB2102502,No.2019YFB2102503);重庆市气象部门业务技术攻关项目(No.YWJSGG-202218)。

摘　　要：探究重庆市城口县强降雨情景下径流空间分布,为当地防灾减灾提供参考;通过改进的SCS模型,耦合土壤类型、土地利用等数据,模拟计算24 h降雨量(P24 h)为50、75、100、150、200和250 mm共6种降雨情景下的径流量,对比分析2010、2020年城口县土地利用变化下各乡(镇、街道)径流量分布,选取4场次代表性强降雨进行径流量空间模拟。结果显示:城口县降雨径流增加倍数(以P24 h=50 mm为基准)与对应的降雨量呈正比;随着模拟降雨量增加,径流量呈非线性阶梯增加,径流曲线数值较大区域,径流量增加较快,洪涝灾害风险增加;在相同降雨强度下,径流量较高区域主要分布在城口县西南部乡镇;降雨径流变化与土地利用变化密切相关,土地利用变化通过改变径流曲线数值大小影响降雨径流量;4场次实际降雨模拟结果表明城口县双河、周溪、明通、葛城、修齐、河鱼、东安等乡(镇、街道)是暴雨洪灾重点防范区。上述研究成果可为城口县暴雨洪水灾害预报预警提供支撑。To investigate the spatial distribution of runoff under heavy rainfall scenarios in Chengkou County,Chongqing Municipality,and to provide reference for local disaster prevention and mitigation.To simulate the runoff volume under six rainfall scenarios with 24-h rainfall amounts of 50,75,100,150,200,and 250 mm through the improved SCS model,coupled with data on soil type and land use,and to analyze the distribution of runoff volume in each township of Chongqing Municipality.To select four representative heavy rainfall scenarios for runoff volume spatial simulation in 2010 and 2020.The results show that:rainfall runoff in Chengkou County is statistically positively correlated with rainfall;with the increase of simulated rainfall,the runoff volume increases in a non-linear step,and in the area with larger CN value,the runoff volume increases faster,and the risk of flooding increases;in the same rainfall intensity,the higher runoff volume area is mainly distributed in the southwestern townships of Chengkou County;the changes in rainfall runoff are closely related to the changes in land use.Land use changes affect the rainfall runoff volume by changing the size of the CN value;the simulation results of four actual rainfall events show that Shuanghe,Zhouxi,Mingtong,Gecheng,Xiuqi,Heyu,Dong'an,and other townships in Chengkou County are the key preventive areas for heavy rainfall and flooding.The above research results can provide support for heavy rainfall and flood disaster forecasting and warning in Chengkou County.

关 键 词：降雨径流 SCS模型 空间模拟 土地利用变化 城口县 

分 类 号：P333[天文地球—水文科学]