CAJ | 학술논문

伴随城市快速发展,城市不透水面积持续增加,使得在同等降雨条件下流域内洪峰流量增加、峰现时间缩短,洪涝灾害威胁扩大.城市水利工程众多,虽然城市排水管网和河道都经过全面整治,但随着城区面积增加,城区防洪排涝河道和管网的服务范围、下垫面状况、排水单元和沟渠、支流发生了显著改变,河网的产汇流过程也发生了较大变化.针对城市洪涝灾害发生的复杂性和不确定性特点,提出北京市洪涝模型构建技术框架,并以清河流域为典型流域构建洪涝模型,分别从不同下垫面和降雨条件下河网排洪能力复核、河道防洪预警指标细化、城市洪涝风险量化等方面构建基于洪涝模拟的城市防汛安全调度技术体系.
반수성시쾌속발전,성시불투수면적지속증가,사득재동등강우조건하류역내홍봉류량증가、봉현시간축단,홍로재해위협확대.성시수리공정음다,수연성시배수관망화하도도경과전면정치,단수착성구면적증가,성구방홍배로하도화관망적복무범위、하점면상황、배수단원화구거、지류발생료현저개변,하망적산회류과정야발생료교대변화.침대성시홍로재해발생적복잡성화불학정성특점,제출북경시홍로모형구건기술광가,병이청하류역위전형류역구건홍로모형,분별종불동하점면화강우조건하하망배홍능력복핵、하도방홍예경지표세화、성시홍로풍험양화등방면구건기우홍로모의적성시방신안전조도기술체계.
With the rapid urbanization, the ratio of impervious area in river basins has increased greatly. It resulted in the increase of peak flood discharges, reduction of time of concentrations, and expanding threat of flood disasters. Especially, under the unified planning and overall management of channels and drainage systems for urban rivers, the rainfall-runoff relationship is changed greatly at urban river basin scale. Considering the complex and uncertainty of urban flood disasters, this paper proposes a technical framework of urban flood model, and taking Qinghe River as an example to construct the model. The river flood diversion capacity is rechecked. The indicator levels of early warning of river flood are refined with quantified the relationship between flood peak and rainfall depth. The watershed flood risk characteristics are also addressed based on the model. This study would provide a guide to flood control and storm water utilization assessment in the watershed of urban area.