An Improved Precipitation-Runoff Model Based on MMS and Its Application in the Upstream Basin of the Heihe River
An Improved Precipitation-Runoff Model Based on MMS and Its Application in the Upstream Basin of the Heihe River
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发表时间：
2008
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通讯作者：
Chao Zhen-hua
中科院分区：
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作者：
Chao Zhen-hua
The Heihe river upstream basin was selected as a case study,the mechanisms of runoff yield and concentration in upstream mountain areas were cognized by using the rainfall-runoff relevant modules in MMS(modular modeling system) model.Considering hysteresis of rainfall seepage in non-saturated soil,and integrated the snowmelt models and frost-soil area identify models together,the existing tested-basin PRMS(precipitation-runoff models) was modified and improved in this study.The improved new PRMS is used to simulate and forecast the hydrological process in the upstream of the Heihe River,and the results showed that the improved new PRMS was more suitable for the dry and cold mountain areas of inland basins.Due to considering the frost-soil conditions,the runoff simulation and forecast error is less than 2.7%,and each element of runoff composition was simulated and forecasted more veracious than the original PRMS.Finally,the stream flow changing trends were analyzed under different climate and land cover change scenarios in future,which provided the scientific basis for the rational use and management of water resources in the Heihe River Basin.
