Hydrological response under land use change scenarios for the upper Huaihe watershed based on SWAT model
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Abstract:
In the Huaihe watershed, unreasonable land use is one of the important factors that lead to soil erosion. It’s the important premise to explore the land use change under the hydrological response in terms of carrying out the work of soil and water conservation. In this study, the SWAT (Soil and Water Assessment Tool) model was established with the upper Huaihe River basin upstream of the WangJiaBa hydrologic controlling station as the study area. Firstly, the applicability of the model was verified. Then the optimal land use scenario was constructed by farmland suitability evaluation. Finally, the hydrological responses to the optimal land use scenario, ecological protection situation and the land use in 2000 were analyzed using the SWAT model. The results showed that hydrological response changes of ecological protection situation were very small. Based on the optimal land use scenario of land suitability evaluation, 41.29% of the farmland was turned into forest land. As a result, compared with the land use in 2000, the annual surface runoff and sediment yield were decreased, ground water was increased. Monthly surface runoff and sediment yield were decreased, and monthly ground water was increased. However annual and monthly evaporation changed slightly. The study revealed that in the condition of optimal land use, the ability of soil and water conservation was stronger, and it was more obvious in flood season.
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