Runoff Simulation under the Effects of the Modified Soil Water Assessment Tool (SWAT) Model in the Jiyun River Basin
Few studies have been conducted to simulate watersheds with insufficient meteorological and hydrological information. The Jiyun River watershed was selected as the study area. A suitable catchment area threshold was determined by combining the river network density method with the Soil and Water Ass...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/11/2110 |
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| author | Zhaoguang Li Shan Jian Rui Gu Jun Sun |
| author_facet | Zhaoguang Li Shan Jian Rui Gu Jun Sun |
| author_sort | Zhaoguang Li |
| collection | DOAJ |
| description | Few studies have been conducted to simulate watersheds with insufficient meteorological and hydrological information. The Jiyun River watershed was selected as the study area. A suitable catchment area threshold was determined by combining the river network density method with the Soil and Water Assessment Tool (SWAT) models, which was driven using the CMADS dataset (China Meteorological Assimilation Driving Datasets for the SWAT model). Monthly runoff simulations were conducted for the basin from 2010 to 2014, and the calibration and validation of model parameters were completed with observed data. The results showed that the final expression for the density of the river network in the Jiyun River basin as a function of density (<i>y</i>) and the catchment area threshold (<i>x</i>) was obtained as <i>y</i> = 926.782<i>x</i><sup>−0.47717</sup>. The “inflection point” of the exponential function was the optimal catchment area threshold. The catchment area threshold had an upper and lower limit of the applicable range and was related to the percentage of the total basin area. The simulation results would be affected if the threshold values were outside the suitable scope. When the catchment area was 1.42% of the entire watershed area, increasing the threshold value had less effect on the runoff simulation results; decreasing the threshold value would cause the simulation results to be unstable. When the catchment area reached 1.42% to 2.33% of the total watershed area, the simulation results were in good agreement with the observed values; the coefficient of determination (<i>R</i><sup>2</sup>) and Nash–Sutcliffe efficiency coefficient (<i>NSE</i>) were more significant than 0.79 and 0.78 for the calibration periods evaluation index. Both were greater than 0.77 and 0.76 for the validation period, which met the evaluation requirements of the model. The results showed that the CMADS-driven SWAT model applied to the runoff simulation and the river network density method adoption to determine the catchment area threshold provided a theoretical basis for a reasonable sub-basin division in the Jiyun River basin. |
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| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-11T02:53:35Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
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| series | Water |
| spelling | doaj.art-31725ce82ea6422ea146eb5bf4ec0c1b2023-11-18T08:47:43ZengMDPI AGWater2073-44412023-06-011511211010.3390/w15112110Runoff Simulation under the Effects of the Modified Soil Water Assessment Tool (SWAT) Model in the Jiyun River BasinZhaoguang Li0Shan Jian1Rui Gu2Jun Sun3College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, ChinaCollege of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, ChinaCollege of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, ChinaResearch Centre for Indian Ocean Ecosystem, Tianjin University of Science and Technology, Tianjin 300457, ChinaFew studies have been conducted to simulate watersheds with insufficient meteorological and hydrological information. The Jiyun River watershed was selected as the study area. A suitable catchment area threshold was determined by combining the river network density method with the Soil and Water Assessment Tool (SWAT) models, which was driven using the CMADS dataset (China Meteorological Assimilation Driving Datasets for the SWAT model). Monthly runoff simulations were conducted for the basin from 2010 to 2014, and the calibration and validation of model parameters were completed with observed data. The results showed that the final expression for the density of the river network in the Jiyun River basin as a function of density (<i>y</i>) and the catchment area threshold (<i>x</i>) was obtained as <i>y</i> = 926.782<i>x</i><sup>−0.47717</sup>. The “inflection point” of the exponential function was the optimal catchment area threshold. The catchment area threshold had an upper and lower limit of the applicable range and was related to the percentage of the total basin area. The simulation results would be affected if the threshold values were outside the suitable scope. When the catchment area was 1.42% of the entire watershed area, increasing the threshold value had less effect on the runoff simulation results; decreasing the threshold value would cause the simulation results to be unstable. When the catchment area reached 1.42% to 2.33% of the total watershed area, the simulation results were in good agreement with the observed values; the coefficient of determination (<i>R</i><sup>2</sup>) and Nash–Sutcliffe efficiency coefficient (<i>NSE</i>) were more significant than 0.79 and 0.78 for the calibration periods evaluation index. Both were greater than 0.77 and 0.76 for the validation period, which met the evaluation requirements of the model. The results showed that the CMADS-driven SWAT model applied to the runoff simulation and the river network density method adoption to determine the catchment area threshold provided a theoretical basis for a reasonable sub-basin division in the Jiyun River basin.https://www.mdpi.com/2073-4441/15/11/2110SWAT modelCMADScatchment area thresholdrunoff simulation |
| spellingShingle | Zhaoguang Li Shan Jian Rui Gu Jun Sun Runoff Simulation under the Effects of the Modified Soil Water Assessment Tool (SWAT) Model in the Jiyun River Basin Water SWAT model CMADS catchment area threshold runoff simulation |
| title | Runoff Simulation under the Effects of the Modified Soil Water Assessment Tool (SWAT) Model in the Jiyun River Basin |
| title_full | Runoff Simulation under the Effects of the Modified Soil Water Assessment Tool (SWAT) Model in the Jiyun River Basin |
| title_fullStr | Runoff Simulation under the Effects of the Modified Soil Water Assessment Tool (SWAT) Model in the Jiyun River Basin |
| title_full_unstemmed | Runoff Simulation under the Effects of the Modified Soil Water Assessment Tool (SWAT) Model in the Jiyun River Basin |
| title_short | Runoff Simulation under the Effects of the Modified Soil Water Assessment Tool (SWAT) Model in the Jiyun River Basin |
| title_sort | runoff simulation under the effects of the modified soil water assessment tool swat model in the jiyun river basin |
| topic | SWAT model CMADS catchment area threshold runoff simulation |
| url | https://www.mdpi.com/2073-4441/15/11/2110 |
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