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应用分布式水文模型MIKE SHE模拟杨树人工林生态系统水文过程

发表时间:2008-04-30  浏览量:1681  下载量:814
全部作者: 刘晨峰,张志强,孙阁,朱金兆,查同刚,申李华,方显瑞
作者单位: 北京林业大学水土保持与荒漠化防治教育部重点实验室;美国农业部林务局南方全球气候变化研究组
摘 要: 本文基于分布式水文模型MIKE SHE用实测法对北京市大兴区杨树人工林生态系统2005年至2006年水分平衡研究中所得的林地实际蒸散、土壤水分含量以及林区地下水位等水文要素进行过程模拟,并与实测值进行分析比较,以验证模拟效果。结果显示,经过模型参数主要是土壤不同剖面层的划分,以及各层水分物理属性的反复修正,将土壤剖面各层的饱和导水率Ks分别设定为5e-006、0.000 2和2e-006 m/s;在模型验证过程中模拟精度有所提高,对日蒸散量的模拟结果中相关系数R由模型校正过程中的0.69上升为模型验证结果中的0.86;对土壤含水量的模拟验证结果中确定性系数E分别为0.78和0.56,模拟值与实测值有了较为一致的变化趋势,提示模型参数设置基本合理;从模拟结果可知降雨对当地地下水位并没有明显的补给作用,而实测值的显著变化说明当地地下水位的持续下降或是由于周边农田旱季抽水灌溉造成的,或是由于该研究中对于地下水位变化而言研究尺度太小,对地下水位持续下降的原因还需扩大时间和空间尺度来研究。
关 键 词: 水土保持;MIKE SHE水文模型;模型校正;地下水位;杨树人工林
Title: Application effect test of hydrological model MIKE SHE in poplar plantation ecosystem based on the measured method
Author: LIU Chenfeng, ZHANG Zhiqiang, SUN Ge, ZHU Jinzhao, ZHA Tonggang, SHEN Lihua, FANG Xianrui
Organization: Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, Beijing Forestry University;Southern Global Change Program, USDA Forest Service
Abstract: MIKE SHE hydrological model was employed in this study to simulate the hydrological process of evapotranspiration(ET), soil water centent(SWC) and ground water table depth(WTD) dynamics in poplar ecosystem water balance study of 2005~2006, and to evaluate the MIKE SHE model application effect compared with measured value of these hydrological factors. The result suggested that there was great difference between the model value and measured value in calibration process. After the repeated parameter setup the model precision was increased and the model performed well, the model simulations could capture the dynamics of the soil water content and evapotranspiration process, which indicated that the parameter setup was reasonable and model result was accepted. Model value explained the precipitation had no obvious supply to the ground water. So the reason that the ground water table drop down partly resulted from the irrigation measure during dry days.
Key words: soil and water conservation; MIKE SHE hydrological model; model calibration and validation; ground water table; poplar plantation
发表期数: 2008年8月第8期
引用格式: 刘晨峰,张志强,孙阁,等. 应用分布式水文模型MIKE SHE模拟杨树人工林生态系统水文过程[J]. 中国科技论文在线精品论文,2008,1(8):887-896.
 
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