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<p>Effective watershed water management requires an understanding of how human activities alter land use types and how hydraulic structures impact the hydrological cycle. This study examined the hydrological effects of land use and land cover change (LULCC) as well as reservoir operation on the Seomjin River Basin, South Korea, using the SWAT model. Forestland covers 70% of the study area. The Modules for Land Use Change Evaluation (MOLUSCE) plugin in QGIS examined land use type transitions over a 15-year LULC scenario. The 2008 LULC map was used as a baseline. This study calibrated six model scenarios using 16 sensitive parameters. The SWAT-CUP tools utilized the observed streamflow at the watershed station for calibration and validation processes. The model performed well in mimicking the observed streamflow in each examined scenario. Even with a land-type transition, the hydrological responses of the study watershed remained similar in the 15-year LULC scenario. Most significant transitions occurred in identical land types, which affected the studied watershed’s hydrology. Urban coverage, at less than 3%, did not affect hydrological components in any LULC scenario. The study presents the combined impact of LULC and reservoir scenarios affecting watershed outflow. Compared to the baseline LULC scenario, subbasins with reservoirs have lower peak flow in September, the monsoon season, in 2023. Reservoir operation during the 2013 and 2023 LULC scenarios significantly reduced annual downstream flow compared to the baseline. The 2013 LULC scenario reduced downstream flow by 3%, while the 2023 LULC scenario reduced it by 10%. The combined impact of LULCC and reservoir operation had a significant impact on the outflow of the studied watershed. The findings valuable insights into water sustainability and watershed management.</p>

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Assessing Hydrological Responses to Land Use Type Transition in Watershed with Reservoir Operation Using SWAT Model

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Hiyaw Hatiya Ware,
  • Il-Moon Chung,
  • Ju-Young Shin,
  • Myoung-Jin Um

摘要

Effective watershed water management requires an understanding of how human activities alter land use types and how hydraulic structures impact the hydrological cycle. This study examined the hydrological effects of land use and land cover change (LULCC) as well as reservoir operation on the Seomjin River Basin, South Korea, using the SWAT model. Forestland covers 70% of the study area. The Modules for Land Use Change Evaluation (MOLUSCE) plugin in QGIS examined land use type transitions over a 15-year LULC scenario. The 2008 LULC map was used as a baseline. This study calibrated six model scenarios using 16 sensitive parameters. The SWAT-CUP tools utilized the observed streamflow at the watershed station for calibration and validation processes. The model performed well in mimicking the observed streamflow in each examined scenario. Even with a land-type transition, the hydrological responses of the study watershed remained similar in the 15-year LULC scenario. Most significant transitions occurred in identical land types, which affected the studied watershed’s hydrology. Urban coverage, at less than 3%, did not affect hydrological components in any LULC scenario. The study presents the combined impact of LULC and reservoir scenarios affecting watershed outflow. Compared to the baseline LULC scenario, subbasins with reservoirs have lower peak flow in September, the monsoon season, in 2023. Reservoir operation during the 2013 and 2023 LULC scenarios significantly reduced annual downstream flow compared to the baseline. The 2013 LULC scenario reduced downstream flow by 3%, while the 2023 LULC scenario reduced it by 10%. The combined impact of LULCC and reservoir operation had a significant impact on the outflow of the studied watershed. The findings valuable insights into water sustainability and watershed management.