基于BNU-SWAT模型的地下水埋深模拟

SIMULATION OF GROUNDWATER DEPTH BASED ON BNU-SWAT MODEL

基于BNU-SWAT模型对通州区地下水埋深变化进行了模拟,模拟结果较好地反映了通州区地下水埋深的实际变化趋势.在此基础上,设置了2020年平水年(P=50%)和枯水年(P=75%)2种情景,改变作物种植结构和再生水灌溉模式,模拟了北京市通州区未来地下水位变化趋势.结果表明:种植结构的合理调整,如小麦、玉米等农业用地向林果等经济林地的转变,可以有效减少农业地下水开采量;同时,利用通州区内及周边污水处理厂的再生水进行农业灌溉,不仅减少地下水的开采量,还可以有效补给地下水.以上2种方法的结合对通州区地下水资源保护具有重要的意义.

Groundwater depth was simulated for Tongzhou District of Beijing by using BNU-SWAT.Data obtained were in good agreement with actual tendency of groundwater depth in the area.Based on this model,under two precipitation scenarios,i.e.normal（P=50%） and dry（P=75%） years in 2020,the future groundwater depth was simulated with several scenarios of land uses and reclaimed water irrigation patterns for Tongzhou District.The result showed that a reasonable cropping pattern adjustment,e.g.a transformation of agricultural land of wheat,corn,etc.to orchard and economic woodland,could effectively reduce the amount of groundwater used for irrigation.In addition,by making use of reclaimed water from Tongzhou District and surrounding areas for agricultural irrigation,not only the groundwater exploitation could be reduced,but also the groundwater could be recharged effectively as well.Combination of above two measures has great importance for groundwater resources conservation in Tongzhou District.