苏锡常排涝对江南运河产生的洪涝转移特征

基于丰富翔实的基础资料,建立了专门的水文水动力模型,分析现状调度方案、优化调度方案及不设防方案下苏锡常城市排涝对江南运河水位的影响,并分析城市内部洪涝特征及区域洪涝转移规律。结果表明:与不设防方案对比,现状调度方案能降低常州、无锡、苏州的城市洪峰水位0.28～1.10 m,说明城区大包围有效地降低了城区洪水风险,保证了城区安全,但江南运河的水位随降水量和苏锡常城市排涝量的增加而增大。若采用优化调度方案,城市起排水位适当抬高0.17～0.30 m,运河水位会降低0.00～0.12 m,说明在不大幅增加城市洪涝风险的基础上,可以适当减少城市的排涝量,从而降低江南运河水位,协调城市与区域的防洪关系。

Flood dispatching characteristics of Jiangnan Canal caused by drainage from Suzhou, Wuxi and Changzhou

Based on abundant and detailed basic data, a hydrological and hydrodynamic model was established. The influence of the urban drainage of Suzhou, Wuxi and Changzhou on the water level of the Jiangnan Canal under the current scheduling scheme, optimal scheduling scheme and no scheduling scheme was analyzed. The characteristics of urban flood and regional drainage were also analyzed. The results show that the current scheduling scheme can reduce the urban flood peak water level of Changzhou, Wuxi and Suzhou by 0. 28-1. 10m compared with the no scheduling scheme, revealing that the large surrounding of the urban area can effectively reduce the flood water level and ensure the safety of the urban area. However, the water level of the Jiangnan Canal increases with the rainfall and the drainage in Suzhou, Wuxi, and Changzhou. If the optimal scheduling scheme of which the beginning pumping stage rises by 0. 17-0. 30m appropriately is adopted, the water level of the canal will decrease by 0. 00-0. 12m. It shows that on the premise of not greatly increasing the urban flood risk, the amount of urban drainage can be appropriately reduced to decrease the water level of the Jiangnan Canal and the relationship between urban and regional flood control can be coordinated.