Discussing Related Questions Of Treatment And Planning Of Polders In Southern Jiangsu Province

Through many years’ treatment, the ability of flood control and drainage of polders in southern Jiangsu Province has significantly enhanced, by which the relatively perfect system of flood control and drainage in ploder has preliminary been formed. But with the rapid development of economy and urbanization, some new problems have exposed in the development of the polder construction. On the basis of participating in flood control planning of Kunshan City, studies on the common problems in the treatment of the polder in southern Jiangsu Province have been carried out which included the reasonable scale of ploder, optimal ratio of water surface of ploder, dyke construction standards, water environmental governance and low impact development measures. Taking some polders in southern Jiangsu Province as study cases, some related countermeasures and suggestions have been put forward.Firstly, based on the analysis of development and management process of polders in southern Jiangsu Province, the conclusion that the reasonable scale of ploder in southern Jiangsu Provence is more than 5000 mu was proposed by studying the relationship between scale of polder, height of water-retaining and length of dykes in consideration of the factors such as surface water ratio, topography, administrative districts, waterway transportation etc.Secondly, the method of determining the optimal ratio of water surface of ploder in the south of Jiangsu has been put forward by studying the relations between different water surface ratio and designable drainage discharge. In the meantime, taking minimum invest as the objective function, drainage flow of pumping stations and the ecological water consumption as constraint conditions, the mathematical model of optimal ratio of water surface in ploder has been constructed. Taking Jin Cheng Polder in Kunshan city as a study case, it is concluded that the optimal ratio of water surface of ploder in southern Jiangsu Province should be 8%-12%.Thirdly, by analyzing hydrological characteristics and the dyke construction situation in the south of Jiangsu, and with the comprehensive considerations of height of water-retaining, dyke section structure and size, the height changes of flood and the importance of protected areas on both sides of the river, some specific measures for the improvement of dyke design of the ploder in southern Jiangsu Province have been proposed combining with the experience of ecological dyke construction in the developed countries.Fourthly, according to the water environment pollution status of ploders in southern Jiangsu Province, analysis about the advantages of clean water diversion in improving the water environment has been taken out. Taking the treatment of the water environment in Kunshan Caoanlunan Ploder as a study case, some analysis of clean water diversion measures were put forward, which could provide some reference for similar water changeing project of ploders in southern Jiangsu Province.Finally, connotation, construction goals, and construction approach of the low impact development measures for urban construction were elaborated. The necessity of the low development measures in the treatment of ploders in southern Jiangsu Province has been analyzed, and the concrete measures of how to build a low impact development system was proposed by considering the characteristics of ploders in southern Jiangsu Province.The conclusions by studying on reasonable scale of polder, surface water ratio of polder, dyke construction standards, water environmental treatment and low impact development measures could provide some references for future management of ploders in southern Jiangsu Province.