[1]FENG Qiyu,HU Haiying,LIU Junda.Simulation of Non-Point Pollution in Siheshui Basin by Use of SWAT Model and Limited Data[J].Research of Soil and Water Conservation,2021,28(05):128-133.
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Simulation of Non-Point Pollution in Siheshui Basin by Use of SWAT Model and Limited Data
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 05
Page number:
128-133
Column:
Public date:
2021-08-20
- Title:
- Simulation of Non-Point Pollution in Siheshui Basin by Use of SWAT Model and Limited Data
- Keywords:
- SWAT model; watershed within limited data; mean concentration method; non-point source pollution; temporal and spatial distribution characteristics
- CLC:
- X522
- DOI:
- -
- Abstract:
- Based on the monitoring data of water quantity and pollutants in 8 rainfall events,the non-point source pollution load at the outlet section of the basin was estimated according to the average concentration method,and was used to calibrate and verify the model parameters. The variation process of sediment,total nitrogen and total phosphorus in different underlying surface conditions was modeling and the temporal and spatial distribution characteristics were analyzed. It could be seen that SWAT model was feasible in the southern humid area. The results indicate that the distribution of pollution load was uneven,most of pollution loads concentrated in the flood season covering the period from April to September. The spatial distributions of pollution loads of total nitrogen and total phosphorus in the basin were similar,the pollution load was large in the northeast area of the upper reaches of the basin where the villages clustered and the proportion of cultivated land was large. Moreover,the output of pollutants in the lower reaches of the basin is large because of the influence of the human activities. The differences of pollution load transports per unit area of different land use types were significant and the loss intensities of sediment,organic phosphorus and organic nitrogen transport of each land type increased in the order: forest land<construction land<grassland<farmland. Farmland was the key source area of non-point source pollution loss. If the measures of returning farmland to forests were implemented,the pollution loads of sediment,TN and TP would reduce by 35.8%,46.1% and 35.8%,respectively. Moreover,nitrogen and phosphorus fertilizer applications reduced by 50%,which decreased TN and TP loads by 18.1% and 8.9%,respectively. Therefore,reducing the amount of fertilizer and implementing the measures of returning farmland to forest are the keys to control the non-point source pollution in Siheshui Basin. This study can provide the theoretical basis for watershed ecological environment management.
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Last Update:
2021-08-20