无资料区小流域山洪灾害过程数值仿真研究  

Numerical Simulation Study of Flash Flood Disaster Processes in Small Watersheds in Ungauged Areas

作　　者：徐富刚 曾佳鑫 胡文龙[1] 钟千有 许小华[2] XU Fu-gang;ZENG Jia-xin;HU Wen-long;ZHONG Qian-you;XU Xiao-hua(School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China;Jiangxi Province Institute of Water Conservancy and Science,Nanchang 330029,China)

机构地区：[1]南昌大学工程建设学院,江西南昌330031 [2]江西省水利科学研究院,江西南昌330029

出　　处：《水电能源科学》2023年第4期92-96,共5页Water Resources and Power

基　　金：中国博士后基金项目(2019M652281);江西省自然科学基金项目(20212BAB204057,20202BAB204034)。

摘　　要：为揭示无资料区小流域山洪灾害爆发过程及致灾机理,以江西省樟树市芗溪河小流域为例,建立暴雨洪水情况下松散体运移数值模型,分析了暴雨发生过程及泥沙运移规律。结果表明,对河道而言,高地势、坡降变化处与汇流地区流速较大,对于坡面较缓、汇水面积大的区域,汇流点流速相对其他区域增长尤为显著;流域初期局部积水,短期内出现地表径流,汇集而成的水流冲刷出多条沟壑,泥沙多在下游出口处沉积;流域水深、流速与降雨量相关,降雨量越大,水深流速越大,冲刷情况越显著。研究成果对于该地区山洪预警具有积极意义。In order to reveal the process and mechanism of outbreak of flash floods and causing disasters in ungauged areas,a numerical model of the transport of loose bodies under heavy rainfall floods was established in the Xiangxi River subbasin of Zhangshu City,Jiangxi Province.The process of heavy rainfall and the law of sediment transport were analyzed.The results show that for the river,the flow velocity is higher at the high terrain,slope drop change and the confluence area,and for the area with gentle slope and large catchment area,the increase of flow velocity at the confluence point is especially significant compared with other areas;The local water accumulation at the beginning of the basin,surface runoff occurs in a short period of time,and the gathered water scours out several gullies,and sediment is mostly deposited at the downstream outlet;The water depth and flow velocity of the basin are related to the rainfall.The greater the rainfall,the greater the water depth and flow velocity is,the more significant the scouring situation is.This study has positive significance for flash flood warning in the region.

关 键 词：无资料区 小流域 暴雨山洪 泥沙运移 数值仿真 

分 类 号：TV122[水利工程—水文学及水资源]