Scenarios analysis of field waterlogging in Lixiahe Plain, Jiangsu Province —case study of a typical polder in Gaoyou Irrigation District
MI Boyu1,2, CHEN Haorui1,2*, JIN Yinlong3, WANG Shaoli1,2, LI Jiang′an4, SUN Yong4
1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Reseach, Beijing 100038, China; 2. National Center for Efficient Irrigation Engineering and Technology Research-Beijing, Beijing 100048, China; 3. School of Water Resources and Hydropower Research, Wuhan University, Wuhan, Hubei 430072, China; 4. Gaoyou Water Administration Bureau, Gaoyou, Jiangsu 225600, China
Abstract：In order to analyze the changing characteristics offield waterlogging in the Lixiahe Plain in Jiangsu Province after environmental changes, taking a typical polder in Gaoyou Irrigation District as an example, the waterlogging distribution and production reduction were simulated with a distributed model of field waterlogging under varying conditions of environmental factors such as rainstorm intensity, bucket scale, efflux conditions, pumping capacity, and pumping station scheduling rules, etc. The results show that under current conditions, the area affected by waterlogging in the study area will be 10.47% when 5% rainstorm is encountered, with 4.07% maximum yield reduction rate. However, when 2% and 1% rainstorms are encountered, the ratio of waterlogged area increases to 56.54% and 86.87%, and the maximum yield reduction rate increases to 10.32% and 13.37%. If the depth of the bucket ditch is dug from the current 1.3 m to 2.0 m, the area affected by 5%, 2%, and 1% rainstorm conditions can be reduced by 14.73%, 16.11%, and 3.91%, and the maximum yield reduction rate can be reduced by 5.16%, 4.75%, and 3.81%. If the water level of the outer river is pre-dropped by 0.5 m, the area affected by 5%, 2%, and 1% rainstorm conditions can be reduced by 86.87%, 13.62%, and 8.52%, and the maximum yield reduction rate can be reduced by 66.59%, 40.60%, and 28.12%. If the efflux capacity of the pumping station in the study area is increased from the current 9 m3/s to 14 m3/s, the situation remains unchanged when 5% rainstorm is encountered, while under 2% and 1% rainstorm conditions, the affected area can be reduced by 31.68% and 11.52%, and the maximum yield reduction rate can be reduced by 31.10% and 11.44%. Decreasing the drainage level valve of the pumping station without lowering the warning water level of the outer river has almost no impact on the flood mitigation effect.
米博宇,陈皓锐,金银龙,王少丽,李江安,孙勇. 江苏里下河平原农田涝灾的情景模拟分析——以高邮灌区典型圩垸为例[J]. 排灌机械工程学报, 2021, 39(6): 608-614.
MI Boyu,CHEN Haorui*,JIN Yinlong,WANG Shaoli,LI Jiang′an,SUN Yong. Scenarios analysis of field waterlogging in Lixiahe Plain, Jiangsu Province —case study of a typical polder in Gaoyou Irrigation District. Journal of Drainage and Irrigation Machinery Engin, 2021, 39(6): 608-614.
