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| Factor analysis and application of drainage modulus of local depression in polders along Yangtze River |
| DUAN Shengpo1, WU Yubai1,2, JIN Qiu2, SHAO Xiaohou1 |
| 1.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2.Jiangsu Water Conservancy Research Institute, Nanjing, Jiangsu 210017, China |
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Abstract Serious waterlogging disasters occur frequently in local depressions of polders along Yangtze River, so that it should be managed at first of the moment. Focused on the local depressions of polders in Jiangdu District, the relationships between drainage modulus, drainage acreage, water surface ratio, depth of river and recurrence period are established based on hydrology analysis and calculation. The reasons of waterlogs occur in a typical local depression are inferred, which were followed by the effective preventive measures. The results indicate that the partial correlation coefficient between drainage modulus and drainage area is -0.905, which has the strongest correlation. Furthermore, flooding peak runoff and waterlogging drainage modulus are larger because of the fast floodwater conflux speed in local depressions. The main reasons for the occurrence of waterlogging disaster in local depressions include a lack of river network, large interval between rivers and small drainage modulus as well as unreasonable layout of drainage system. Based on this analysis, a series of measures are put forward to prevent from waterlogs, namely shrinking the interval between rivers, increasing water surface ratio, fully using regulation and storage capacity of waterway. Finally, a drainage pipe network and a layout of waterways, which are suitable to the hydrologic characteristics of local depressions, are proposed.
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Received: 25 August 2015
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