摘要
研究基于GIS技术的海绵城市内涝灾害数值的可视化技术,为城市内涝灾害预防和控制提供可靠分析依据。通过GIS技术采集海绵城市河道、排水口、管网等建模数据后,采用基于GIS技术的海绵城市内涝灾害分析模型对某场暴雨进行实测,通过同频率放大方法,获取不同重现期暴雨的设计降雨过程线,依据过程线以及SWAT模型获取不同重现期的洪峰过程以及积水淹没情况(深度、区域),并通过GIS可视化显示洪峰过程以及积水淹没情况(深度、区域)。可视化模拟结果显示,以安徽六安市为例,采用GIS技术对单个栅格的高程值与建筑物在地面以上的高度相加值进行DEM修正后,六安市内涝积水深度更清晰、准确度;随着重现期的延长,暴雨强度、淹没水位高度、淹没面积、最大积水深度也逐渐增加;从六安市暴雨内涝不同重现期淹没场景中可以看出,随着重现期的延长,淹没区域在六安市3D图中的范围越来越大;5年和25年一遇的洪水淹没区范围很小,但60年一遇的洪水淹没区在六安市北面范围很广,且在西南临界区域分布也较广。
We study the visualization technology of waterlogging disaster in sponge city based on GIS technology, which provides reliable analysis basis for the prevention and control of waterlogging disaster.Through GIS sponge city river, drain and pipe network modeling data, using the sponge urban waterlogging disaster analysis model based on GIS technology to measurement of a storm, through the method of the homogenous frequency enlargement of access to different rainfall return period of the design of the heavy rain process line, according to the process line and the SWAT model for different return period flood process and submergence(depth, area), and through the GIS visualization display flood process and water flooded condition(depth, area).Visual simulation results show, take Lu’an City in Anhui Province as an example, that the depth of water logging water in lu ’an city is clearer and more accurate after DEM correction of elevation value of a single grid and the addition value of building height above the ground by GIS technology.With the extension of the recurrence period, the intensity of rainstorm, the height of flooded water level, flooded area and the maximum depth of the water gradually increased.It can be seen from the inundation scenes in different recurring periods of rainstorm waterlogging in lu ’an that, with the extension of the recurrence period, the inundation area in the 3 D map of lu ’an becomes larger and larger.The five-and 25-year flood zones are very small, but the 60-year flood zones are very large to the north of lu’an city and widely distributed in the southwest critical region.
作者
王颖
王强国
WANG Ying;WANG Qiangguo(City College of Science and Technology,Chongqing University,Chongqing 402167,China;Chongqing Municipal Design Institute,Chongqing 400020,China)
出处
《灾害学》
CSCD
北大核心
2020年第2期70-74,共5页
Journal of Catastrophology
基金
重庆市教委科技研究项目(KJ1602302)。
关键词
GIS技术
海绵城市
内涝灾害
数值可视化
SWAT模型
重现期
GIS technology
sponge city
waterlogging disaster
numerical visualization
SWAT Model
recurrence period
作者简介
第一作者:王颖(1984-),女,汉族,湖北监利人,硕士,副教授,研究方向为环境设计.E-mail:103311728@qq.com。
