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| DOI： |
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| Calculating Spatio-spatial Distribution of Waterlogged in Jianli County Using the DHSVM Model |
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XIONG Qinxue, TIAN Xiaohai, ZHU Jianqiang
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Agricultural College of Yangtze University, Jinzhou 434025, China; Hubei Collaborative Innovation Center for Grain Industry, Jinzhou 434025, China
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| Abstract: |
| We calculated the spatio-spatial distribution of waterloggingin Jianli County of Hubei province using the DHSVM model (The Distributed Hydrology Soil Vegetation Model). The region in the county was divided into a number of grids, each being 90 m×90 m. The dynamic of soil moisture in each grid was simulated using a water balance model. We calculated the distribution of waterlogging in summer by classifying the waterlogging into three categories when the groundwater table was less than 0.6 m deep: when the duration of five-day average volumetric water higher than 90% lasted more than 5 days (light waterlogging), or lasted more than 12 days (moderate waterlogging), or lasted more than 20 days (severe waterlogging). We simulated the distribution of soil moisture and groundwater table in all grids from January to May in 2014 and 2015 during the growing season of summer crops using a temporal resolution of one day. These results enabled us to predict the spatio-temporal distribution of waterlogging in the region for the first time. This retrieval method was proven accurate after testing in several fields. |
| Key words: sub-surface waterlogged hazards; DHSVM model; spatial-temporal distribution |
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