长江中游洪水调度研究(III):防洪工程体系效果浅析

长江中游荆江洞庭湖区的防洪工程体系包括三峡水库以及分散的多个分蓄洪区,它们在不同类型来流情况下可能显示出不同的运用特点和效果。以1%设计标准的洪水为讨论前提,采用洪水调度数学模型分析了各种来流情况下的工程效果。其结果显示:三峡水库的调节作用主要是避免了荆江分蓄洪区的启用,将荆江段的超额洪量转移到水库进行调蓄;尽管不同类型洪水条件下各分蓄洪区运用情况不尽一致,但有、无三峡水库条件下,城陵矶附近总分洪量变化不大,分洪后的洪峰水位也变化不大。

Analysis of Flood Damage Reduction System in the Middle Yangtze River (III): Effects Simulation of the System

Flood reduction system in the middle Yangtze River is constituted of the Three Georges Reservoir and more than twenty flood detention areas. Their behaviors and effects may differ with flood hydrology. The effect of the system is discussed with 1% synthetic flood. The results show the operation of the detention areas in the Jingjiang reach can be avoided because of the flood storage capacity of the Three Georges Reservoir. With the flood type of 1954, 1995, 1996 and 1998, both the flood diversion volumes and peak flood levels show little differences in the vicinity of Chenglingji in the pre- and post-dam situation.