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设计暴雨是区域防洪排涝和城市市政排水的重要基础,是关系到区域安全和城市运行的重要问题。利用天津站和塘沽站完整的分钟降雨量资料以及环城四区和滨海新区其它台站的降雨年最大值资料,推求了各台站的暴雨强度公式,分析了天津市城市化对设计暴雨强度的影响,以及中心城区与滨海新区的空间差异。结果表明:城市化对设计雨量有明显的影响,城区重现期1a的暴雨强度有降低的趋势,而重现期3 a以上的暴雨强度有所增强,而且城市化效应在不同环城区域存在明显的一致性,环城四区排水设计在重现期1a及以下时对城市化影响应有所考虑,而3 a以上重现期设计雨量采用中心城区暴雨公式是安全的;滨海新区3个区域各历时不同重现期下的暴雨强度均高于中心城区,尤其是塘沽远远高于中心城区,滨海区域采用全市统一的暴雨公式进行排水系统设计是不安全的,宜采用滨海新区各区县当地的暴雨强度公式。
Design storm is an important foundation for regional flood control and drainage and urban drainage, and is an important issue that concerns regional security and urban operation. Based on the full minute rainfall data of Tianjin Station and Tanggu Station and the maximum annual rainfall data of four stations in the four districts of the city and the Binhai New Area, the formula of storm intensity at each station was deduced. The effects of urbanization on the design of storm intensity As well as the spatial differences between the central urban area and the Binhai New Area. The results show that the urbanization has a significant effect on the design rainfall. The intensity of rainstorm in the urban renewal period 1a tends to decrease, but the intensity of the heavy rainfall above 3 years in the recurrence period is enhanced, and the urbanization effect exists in different urban areas Significantly consistent, the design of the drainage around the four districts of the city should take into account the impact on urbanization during the period of 1a and below, while it is safe to design the rainstorm using the central urban area in the period of 3 years and above. Three The intensity of rainstorms under different periods of different durations are higher than that of central urban areas, especially in Tanggu, which is far higher than central urban areas. It is unsafe to adopt the uniform rainstorm formula in the coastal area to design drainage systems. It is advisable to adopt all districts and counties in Binhai New Area Local storm intensity formula.