阳澄淀泖区圩区排涝对区域防洪的影响分析

Analysis of influence on region flood control due to polder waterlogging drainage in Yangcheng and Dianmao area

阳澄淀泖区属于典型的平原河网地区,河湖密布,地势低洼。为了抵御洪水,区域内建成大小联圩366个,约占总面积的50%。圩区建设是平原河网低洼地区的重要防洪排涝措施,但随着圩区规模的扩大、防洪排涝标准的不断提高,使得骨干河道洪水位上升,对区域防洪产生重要影响。以实测资料和圩区现状调查为基础,构建了能反映现状河网、圩区分布、圩区调度的数学模型,定量分析了圩区排涝对区域防洪影响。所建立的数学模型及对圩区排涝对区域防洪的影响分析可为阳澄淀泖区的洪水计算、防洪规划、圩区建设提供理论依据。

As a typical plain river network region, the area of Yangeheng and Dianmao is a low - lying land with serried rivers and lakes distributed. To prevent flood, 366 polders were constructed in the area, accounting for about 50% of the total geometric area. The polder area construction played an important role in flood control and waterlogging drainage in the low - lying areas of plain river network. But with the expansion of the polder areas and raised standard of flood control and waterlogging drainage in polder area, the water level in the main river rises a lot under the same flood, which has a large impact on the flood control in this area. Based on plenty of measured data and investigation on the current situation of the polders, a numerical model that reflects current river network and polders is built and the influence of polder waterlogging drainage on flood control is analyzed quantita- tively. The model and analysis results can provide theoretical basis for construction of the polder areas and flood control planning of Yangcheng and Dianmao area.