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《Advances in Earth Science》 2012-07
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Soil Moisture Dynamic Simulation of Different Underlying Surface in the Hai River Basin

Zhu Zhongli,Lin Liuying,Xu Tongren(State Key Laboratory of Remote Sensing Science,School of Geography,Beijing Normal University,Beijing 100875,China)  
A vertical soil moisture(θ)-based unsaturated soil hydrodynamic numerical model was developed and used to simulate soil moisture movement at Miyun(orchard woodland),Daxing(Suburban farmland),Guantao(plain farmland) sites,which represent different underlying surface types in the Hai River Basin.The model based on one dimensional Richards' equation(hereinafter referred to as the RE model) and the top boundary was input ground-measured rainfall and evapotranspiration data.Soil moisture during different growth stages was numerically simulated based on the fully implicit Finite Differential Method to obtain time series of soil moisture profile.Soil moisture simulated by mature HYDRUS-1D software and observed at the sites was used for cross-validation and direct verification on the RE model simulation results,respectively.The result showed that the RE model was able to simulate the soil water dynamic changes of different underlying surfaces in Hai River Basin,with root mean square error(RMSE) compared to the observed soil moisture at three sites being 0.0313,0.0359 and 0.0409 cm3/cm3,respectively.Compared to the simulation results of HYDRUS-1D software(whose RMSE were 0.0376,0.0647 and 0.0467 cm3/cm3,respectively),the soil water simulated by RE model had higher precision which also showed the RE model reliability.The spatial and temporal variation of soil moisture and its impact factors were discussed.For the case of Daxing site,we analyzed the impact of plow on soil moisture modeling by optimizing the RE model parameters,under which consideration improved the simulation accuracy of the RE model was improved.
【Fund】: 国家自然科学基金项目“基于探地雷达面反射法的土壤水分观测实验研究”(编号:41071225)和“地表水热通量的时空尺度扩展研究”(编号:40971194);; 中央高校基本科研业务费专项;; 中德合作项目“基于遥感和数据同化方法的海河流域水文通量预测研究——SP2:不同尺度蒸散量和土壤水分的观测研究”(编号:30911130504)资助
【CateGory Index】: S152.7
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