论文部分内容阅读
以海南省海甸岛为例,基于带有地表属性信息的高精度DEM地形网格,依据城市分区精细产流方法计算产流,以分段线性化方式拟合实际雨水管网排水能力曲线,并建立了排水能力与潮位新型函数关系式,将水陆边界条件处理为可双向过水的模型边界,最终将地表产汇流模块、地下管网水动力模块和潮(洪)水漫滩淹没模块三者耦合,建立沿海城市潮、雨遭遇内涝模型,探讨潮、雨遭遇情况下城市水情和涝情特征及差异。结果表明,潮、雨遭遇情景下城市内涝整体情况更加恶化,积水面积剧增;不同区域内涝恶化原因不同,临海区域主要是潮水倒灌引起,城区内部区域恶化主要是高潮位顶托下内水无法外排所致;对比单独降雨下,典型内涝代表点积水深度平均增加0.22 m,积水历时平均增加7.70 h,深度积水持续时间显著延长。
Taking Haidian Island of Hainan Province as an example, based on the high-precision DEM terrain grid with surface attribute information, the runoff is calculated according to the fine-grained flow method of urban zoning, and the actual rainwater pipeline drainage capacity curves are fitted by piecewise linearization A new functional relation between drainage capacity and tide level was established, and the boundary conditions of water and land were treated as two-way cross-flow boundary of the model. Finally, the surface runoff and confluence module, the underground pipe network hydro-dynamic module and the submerged floodplain flooding module Coupled with the establishment of coastal city tide, rain suffered waterlogging model to explore the tide, rain encounter urban water conditions and waterlogging characteristics and differences. The results show that under the circumstance of tide and rain, the overall situation of urban waterlogging worsens and the area of waterlogged increases sharply. The causes of waterlogging deterioration in different regions are different. The coastal area is mainly caused by the intrusion of tidal water. Compared with single rainfall, the average depth of typical waterlogging representative points increased by 0.22 m, the average duration of accumulated water increased by 7.70 h, and the duration of deep water retention was significantly prolonged.