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利用小集水区生态水文学模型-Topog 模型对雷州半岛桉树人工林纪家示范小集水区进行了地形分析和静态水文学模拟。地形分析表明,该集水区地表较为平坦,集水区总面积为0.63 km2,夏季、冬季与春(秋)分平均太阳辐射值分别为44 MJ·m-2·d-1、25 MJ·m-2·d-1 和34 MJ·m-2·d-1。在考虑太阳辐射影响与不考虑太阳辐影响两种情况下进行了集水区土壤含水量指数(WI)静态模拟。设定不同的静态壤中流参数值,Topog 模型模拟结果表明,静态壤中流越大,在集水区内高WI 的分布范围越大,也即土壤含水量越高。在考虑太阳辐射影响的条件下,分别设置不同的土壤导水率(T)、地表阴蔽系数(Es)、平均降雨量(R)进行了模拟。模拟结果表明,WI 分布依各参数的不同而变化。T 越大,在集水区内的WI 重新分布越快;T 越小,在集水区内WI 趋向于平均分布。Es 越大,集水区土壤所保持的含水量越高。集水区WI 随R 增大而有升高趋势。
Based on Topog model, a small catchment ecohydrology model, topographical analysis and static hydrological simulation of Eucalyptus plantation Jijian demonstration catchment in Leizhou Peninsula were conducted. Topographical analysis showed that the surface of the catchment was relatively flat with a total catchment area of 0.63 km2. The average solar radiation values of summer, winter and spring (autumn) were 44 MJ · m-2 · d-1,25 MJ · m-2 · d-1 and 34 MJ · m-2 · d-1. The static simulation of soil moisture index (WI) in catchment area was carried out under both the solar radiation effects and the solar radiation effects. Different parameters of flow in static soil were set. Simulation results of Topog model showed that the larger the flow in static soil, the higher the distribution range of high WI in catchment, that is, the higher the soil moisture content. Under the influence of solar radiation, different soil hydraulic conductivity (T), surface shade coefficient (Es) and average rainfall (R) were simulated. The simulation results show that the WI distribution varies with each parameter. The larger the T, the faster redistribution of WI in catchment; the smaller T, the average WI in catchment tends to distribute. The larger the Es, the higher the water content retained by the catchment soils. Catchment WI increased with R and increased.