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| Modeling waterlogging process of paddy field at flat irrigation district in South China |
| XIONG Yujiang1, XU Junzeng2*, LI Yalong1, LI Jiang′an3, SUN Yong3 |
| 1. Agricultural Water Conservancy Department, Changjiang River Scientific Research Institute, Wuhan, Hubei 430015, China; 2.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 3. Gaoyou Water Administration Bureau, Yangzhou, Jiangsu 225600, China |
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Abstract A simulation model for the waterlogging process in paddy field at flat irrigation district was constructed based the on the tank model. The rain runoff processes were observed in the typical paddy fields at Gaoyou irrigation district, and the adaptive genetic algorithm method was used to verify the flexibility of the paddy tank model. It is found that the performance of the paddy tank model for waterlogging process simulation is well in both calibration and validation periods. For rain runoff from paddy field simulation, the root mean square error ranges from 0.17 to 0.28 mm/h, the correlation coefficient is more than 0.95,and the Nash coefficient varies from 0.79 to 0.96 at calibration period. While the root mean square error ranges from 0.06 to 0.29 mm/h, the correlation coefficient is more than 0.88, the Nash coefficient varies from 0.73 to 0.93 at the validation period. For storage depth in paddy fields, the root mean square error ranges from 15 to 20 mm, the correlation coefficient is more than 0.95, the Nash coefficient varies from 0.84 to 0.90. The results indicate that the proposed paddy tank model can provide an alternative and effective method for the waterlogging process simulation in flat irrigation district in South China.
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Received: 28 March 2018
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