基于临界雨量指标的广州市荔枝湾涌水浸分析

Analysis of Critical Rainfall-based of the Flood and Water-logging Lizhiwan River in Guangzhou

荔枝湾涌流域区域整体地势低洼,局部地势最为低洼区域常出现"水浸街"现象。基于一维管网水流数学模型,比较分析荔枝湾涌流域不同整治工程方案下的水浸情况。研究表明荔枝湾涌流域现状及整治方案的临界雨量不同。实施二期工程将提高上西关涌水浸临界雨量40 mm,增加实施DN2000管工程方案,可将临界雨量提高到160 mm左右。上西关涌水浸点临界雨量与中山八路渠箱污水泵站水闸、溢流闸交错开启方式关系不大。经过对区域区型,雨强进行大量的统计分析,临界雨量作为广州市荔枝湾涌城市防洪减灾管理的指标,结合数学模型可快速预测分析水浸灾害发生与否及其严重和紧急程度。

Lizhiwan River’s basin is the oldest and low-lying region in Guangzhou city, and it is often soaked by water. On the basis of field investigation and data collection, this paper uses one-dimension pipe network flow mathematical model to calculate and analyze the Flood and Water-logging of Lizhiwan River with the combination of different project plans. The study shows that the critical rainfall of the Lizhiwan River is different from that of the basic scheme and its improvement plan.The second phase of the project will increase the critical rainfall by 40 mm. By increasing the implementation of DN2000 pipe project, the critical rainfall can be raised to about 160 mm. The critical rainfall is not insensitive to sluice schedule at Zhongshanba Road. The critical rainfall can be used as an indicator system for the management of flood control and disaster reduction in the city of Lizhiwan River in Guangzhou. It predicts the occurrence of urban water immersion disaster, its severity and emergency, and then releases the alarm information.