巴江岩溶流域水文模拟研究

Hydrological Modeling for Karst Area in Bajiang River Basin

岩溶地区因其多相且不规则的复杂流态使得其水循环模拟及预测较为困难.以石林巴江流域为研究区,将流域内水文气象站点数据与遥感数据相结合,利用MIKE-SHE模型来模拟巴江流域水文过程.该模型对于蒸散发及不饱和带的模拟较为详细.并使用黄家庄水文站2000～2005年的实测日径流量进行率定与验证.结果表明,验证期总水量基本保持平衡,nash-sutcliffe系数为0.84,表明该模型能够模拟短时间内的水流演变过程.在此基础上对模型参数进行敏感性分析,得出降雨量为关键变量,且其空间分布的差异对模拟结果影响较大.

Karst aquifers are known for their heterogeneity and irregular complex flow patters which make them more difficult to model.Although different modeling approaches have been used to make it through,they all have somewhat deficiency.This paper presents one such approach which is based on MIKE-SHE.The model was applied in a Karst area of the Bajiang River Basin with support of the observed and GIS/RS data.Modeling of evapotranspiration and flow in the upper part of the unsaturated zone is more detailed.The model was calibrated and validated by the observed discharge which was got from the Huangjianghzuang Station.The results show that the model is able to adequately simulate temporal evolution of the river discharge,measured by Nash-Sutcliffe coefficient （0.84） as well as overall water balance.Besides,through the sensitivity analysis,we got to know that the precipitation was the key variable,and changes in spatial distribution of precipitation would cause the great influence on the results.