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基于SWAT的西苕溪流域降雨一径流关系及水量平衡分析
李丽娇1,2, 薛丽娟1, 张奇1
1.中国科学院 南京地理与湖泊研究所 湖泊与环境国家重点实验室 , 江苏 南京 210008;2.中国科学院 研究生院 , 北京 100039
摘要:
以SWAT模型为工具,对太湖西苕溪流域进行了径流模拟,采用1988—2001年范家村水文站逐日、逐月实测径流资料对模型进行了参数率定和模型验证,效率系数均大于0.88,径流相对误差均小于4%。在此基础上,重点分析了西苕溪流域的降雨—径流关系和水量平衡。结果表明,研究时段内西苕溪流域降雨—径流关系变化不明显;西苕溪流域的降雨年际分布不均匀;受降雨影响,雨季月径流量和洪峰值均有缓慢上升的趋势。水量平衡分析表明,河道径流、蒸散发、地下水补给量分别占降雨量的54.1%,45.8%,17.3%。
关键词:  降雨—径流关系  水量平衡分析  SWAT  西苕溪流域
DOI:
分类号:
基金项目:中国科学院“百人计划”项目;国家自然科学基金(40471018);国家973计划项目(2002CB412310)
SWAT-based Rainfall-runoff Relationship and Water Balance Analysis in Xitiaoxi Catchment
LI Li-jiao1,2, XUE Li-juan1, ZHANG Qi1
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China;2.Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
Abstract:
SWAT was applied to Xitiaoxi catchment for surface runoff simulation.The model was calibrated and verified using observed data of stream flow at Fanjiacun gauging station in 1988—2001.An efficiency of greater than 0.88 was achieved in quantifying the model's fitness with the observation.A deviation of less than 4% was found in comparison of the predicted volume of stream flow with the observed one.Rainfall-runoff relationship and water balance were analyzed on the basis of the modeling results.The outcomes indicate that rainfall-runoff relationship in Xitiaoxi catchment has no significant alteration in the simulation period.The annual rainfall precipitation varies significantly.The monthly runoff and peak storm flow in wet seasons have a tendency of slow increase,which is affected mainly by rainfall.The water balance analysis indicates that the percentages of stream flow,evapotranspiration,and groundwater recharge over the amount of rainfall are 54.1%,45.8% and 17.3%,respectively.
Key words:  rainfall-runoff relationship  water balance analysis  SWAT  Xitiaoxi catchment