Modeling of Hydrologic Responses on Extreme Land Cover Scenarios
Modeling of Hydrologic Responses on Extreme Land Cover Scenarios
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发表时间：
2011-07
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通讯作者：
Zhai Chunling;Yu Zhongbo;Yang Chuanguo;Ju Qin
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作者：
Zhai Chunling;Yu Zhongbo;Yang Chuanguo;Ju Qin
利用分布式水文模型系统和地理信息系统，利用遥感技术进行数据空间分析，建立了淮河流域陆面-水文耦合模型。利用实测水文数据对模型进行了标定和验证。水文模拟的纳什-萨克利夫系数在0.791~0.854之间，结果表明，LSX-HMS可以用于研究淮河流域水文过程对土地利用/覆被变化(LUCC)的响应。构建了5个极端地表覆盖情景，每个情景由一种类型的土地覆盖组成。利用LSX-HMS对每个覆被情景的水文过程进行了模拟。模拟结果表明，常绿阔叶林覆盖情景可以显著改变研究流域的蒸散量和径流量。利用LSX-HMS模型对不同情景下径流的空间分布进行模拟，结果表明，不同情景下径流的空间分布差异较大，为开发利用、配置和管理淮河流域水土资源提供了依据。
Using the distributed hydrology model system(HMS) and Gographical Information System and the technology of remote sensing for data spatial analysis,a land surface-hydrology coupled model(LSX-HMS) was constructed in the Huaihe river basin.Measured hydrologic data were used to calibrate and validate the model.The Nash-Sutcliffe coefficient for hydrologic simulations ranges from 0.791 to 0.854,indicating that LSX-HMS can be used for studying hydrologic processes responses to land use and cover change(LUCC) in the Huaihe river basin.Five extreme land cover scenarios are constructed with each comprising of one single type of land cover in the Huaihe river basin.The hydrologic processes for each cover scenario are simulated by using LSX-HMS.The simulated results indicate that evergreen broadleaf forest cover scenarios can significantly alter evapotranspiration and streamflow in the studied basin.The annual evapotranspiration increases 5.6% and the annual depth of streamflow decreases 6.7%;the annual depth of streamflow under grass cover scenario increases 6.9%.In dry years,the soil moisture content varies most rapidly under the grass cover scenarios.The modeling of streamflow's spacial distribution with LSX-HMS model shows that there is a great difference under various scenarios.This research provides a basis for developing,utilizing,allocating and managing water and soil resources in the Huaihe river basin.