张家港市中心城区防洪安全与洪水资源化分析

Analysis of flood control safety and flood resource utilization in the downtown area of Zhangjiagang

以张家港市中心城区为例,选取1965—2015年水文数据,采用适线法和同频率法计算200年一遇设计暴雨,运用MIKE11搭建张家港市水文水动力模型,分析计算在超标准洪水条件下张家港市中心骨干河道最高水位,将超标准洪水与常水位下的河道槽蓄量进行比较,计算该条件下张家港市可利用的洪水资源量。结果表明,中心城区在遭遇200年一遇超标准洪水时,河道水位均未超过5.5 m,现有堤防高度基本可以满足该标准的要求,中心城区可利用洪水资源量约为333.63万m^(3)。

Taking the downtown area of Zhangjiagang City as an example,the hydrological data from 1965 to 2015 were selected to calculate the 200-year design rainstorm by using the fitting line method and the same frequency method.The hydrological and hydrodynamic model of Zhangjiagang City was built by using MIKE11 to analyze and calculate the maximum water level of the backbone river in the downtown area of Zhangjiagang City under condition of exceeding standard flood.The available flood resources of Zhangjiagang City under the above standard flood conditions were calculated by comparing the storage capacity of the river channel under the normal water level.The results showed that when the central urban area encountered a 200-year exceeding standard flood,the river water level did not exceed 5.5 m,the existing embankment height could basically meet the requirements of this standard,and the available flood resources in the central urban area were about 3336300 m^(3).