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| Simulation of adsorbed phosphorus load in a mountainous watershed based on an improved SWAT model |
| Received:January 09, 2020 |
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| KeyWord:hillslope sediment delivery ratio;spatial-temporal distribution;total phosphorus;adsorbed phosphorus load |
| Author Name | Affiliation | | LONG Tian-yu | Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400045, China | | ZHONG Shao-rong | Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400045, China | | LI Ye-sheng | Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400045, China | | ZHENG Qi-quan | Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400045, China | | LIU Min | Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400045, China |
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| Abstract: |
| In the SWAT model, the simulated sediment yield is the total sediment yield of the basin; thus, it is impossible to obtain the spatial distribution of the sediment yield and the spatial distribution of the adsorbed load associated with sediment yield. For this reason, a runoff connectivity factor was proposed for a mountainous basin, based on which a temporal and spatial distribution model of improved sediment yield and total adsorbed phosphorus load was formed and verified. By using the model and the method of small watershed expansion, the small watershed model and its model parameters in the Three Gorges Reservoir area of the administrative region of the incomplete watershed were expanded to cover the whole reservoir area in order to realize the simulation of the temporal and spatial distribution of the sediment yield and the total adsorbed phosphorus load in the Three Gorges Reservoir area and to determine the key source areas of the sediment yield and total adsorbed phosphorus load. The model constructed in this study can be applied to other mountain basins. |
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