摘要
北京城市内涝数值模型(BUW)根据北京复杂地形和大城市特点,将各类空间信息剖分为6458个网格及相应的通道,围绕城市地表、河道沟渠、排水管网等城市主要水文水动力学物理过程,模拟积水深度变化情况。以精细化的降水监测为驱动条件,BUW可以较好地模拟出"7·21"城市内涝积水的空间分布,对重点桥区的积水深度,积水过程的模拟也比较贴近实际,具有良好的模拟性能。360 min历时的2年重现期降雨情景下,北京四环内就会产生一定的积水,以孤立的积水点为主。10和50年重现期下,积水的深度和范围都有所增加,且开始呈片状。100年重现期,整个五环内都出现严重的城市积水,南部出现大片超过50 cm的积水区域,部分地区积水超过80 cm。面对"7·21"级别的降水,排水管网直径拓宽20%并不能明显改善城市排水能力。拓宽60%时,四环到五环之间的积水明显减弱,四环以内的大部分积水减弱。拓宽100%时,仅在二环到四环之间还有一些较浅的积水,拓宽140%时,六环内大部分积水消失。
Based on the complex terrain and large city characteristics, the geographic information of Beijing was cut into 6458 grids and corresponding channels. Focused on the urban hydrodynamic and hydrographic process, the Beijing Urban Waterlogging （BUW） numerical model was built to simulate the ponding depth. Driven by high-resolution precipitation observation, BUW can simulate the spatial distribution of the 21 July 2012 urban ponding in Beijing well, and the variation and max depth under concave bridges are close to actual condition too. In the scene of 2-yr Return Period （2-RP）, there are some isolated ponding points inside the 4-Ring Road. The depth and range of ponding increase in 10-RP and 50-RP. Under 100- RP, there is servere pondings within the whole 5-Ring Road with most exceeding 50 em in the south. Fa- cing the rainfall at the 21 July 2012 level, urban drainage will not be improved obviously with 20% of pipe diameter （20 % ＋PD） broadening. The ponding gets relieved distinctly between the Roads of 4-Ring and 5- Ring and slightly inside the 4-Ring in 60 % ＋PD experiment. When the pipe diameter is broadened continu- ously, there is only Shallow ponding between the 2-Ring and the 4-Ring in 100% ＋PD experiment and no ponding insides the 6-Ring in 140%＋PD experiment.
出处
《气象》
CSCD
北大核心
2015年第9期1111-1118,共8页
Meteorological Monthly
基金
北京市科技计划课题(北京地区一公里网格化天气要素快速融合技术及城市积水预报应用)
北京市优秀人才资助项目(2013D002034000003)共同资助
关键词
暴雨
内涝
积水深度
重现期
排水
rainstorm, urban waterlogging, ponding depth, return period, drainage
作者简介
尹志聪，主要从事气候预测及城市气象方面的研究．Email：yinzhc@163.com
通信作者：郭文利，主要从事气候、应用气象业务与研究工作．Email；guowenli44@163.com
