Investigating Nonpoint Source and Pollutant Reduction Effects under Future Climate Scenarios: A SWAT-Based Study in a Highland Agricultural Watershed in Korea
Author:
Sadiqi Sayed Shah Jan1ORCID, Nam Won-Ho2ORCID, Lim Kyoung-Jae3ORCID, Hong Eunmi1ORCID
Affiliation:
1. Department of Environmental Science, Kangwon National University, Chuncheon 24341, Kangwon-do, Republic of Korea 2. School of Social Safety and Systems Engineering, Institute of Agricultural Environmental Science, National Agricultural Water Research Center, Hankyong National University, 327 Jungang-ro, Anseong-si 17579, Gyeonggi-do, Republic of Korea 3. Department of Regional Infrastructure, Kangwon National University, Chuncheon 24341, Kangwon-do, Republic of Korea
Abstract
This study investigated the effects of nonpoint source (NPS) pollution reduction and pollutant dynamics in a highland agricultural watershed in Korea. We employed the SWAT model to simulate hydrological processes and pollution transport within the watershed. The model incorporates future climatic scenarios derived from downscaled climate projections to assess their impacts on NPS pollution and pollutant reduction methods. These changes lead to heightened surface runoff and erosion rates, resulting in elevated sediment and nutrient concentrations. The projection indicates an anticipated increase in the annual average temperature by 1.3 to 2.1 °C by the mid-century, under scenarios SSP126 and SSP585. Additionally, precipitation levels are projected to increase by 31 to 61 mm from the baseline to the end of the century. Variations in hydrological components such as evapotranspiration, streamflow, and soil moisture are expected to range from +3.2 to +17.2%, −9.1 to +8.1%, and 0.1 to 0.7%, respectively, during the years 2040 and 2080. Fluctuations in TN, SS, and TP loading are estimated to range from −4.5 to +2.3%, −5.8 to +29.0%, and +3.7 to +17.4%, respectively. This study emphasizes the importance of adaptive management options for stakeholders and the need for adaptive management options to reduce nonpoint source pollution and protect water quality to maintain sustainable water supplies and conserve the environment in this watershed.
Funder
Korean government (MSIT) for the Basic Science Research Program through the National Research Foundation Kangwon National University
Subject
Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry
Reference61 articles.
1. Non-point pollution from crop production: Global, regional and national issues;Norse;Pedosphere,2005 2. The global progress on the non-point source pollution research from 2012 to 2021: A bibliometric analysis;Xie;Environ. Sci. Eur.,2022 3. Worldwide cases of water pollution by emerging contaminants: A review;Lichtfouse;Environ. Chem. Lett.,2022 4. Biggelaar, C.D., Lal, R., Wiebe, K., Eswaran, H., Breneman, V., and Reich, P. (1999). Soil Degradation: A Threat to Developing-Country Food Security by 2020?, International Food Policy Research Institute. 5. Kim, J., Park, B., Choi, J., Park, M., Lee, J.M., Kim, K., and Kim, Y. (2021). Optimum detailed standards to control non-point source pollution priority management areas: Centered on highland agriculture watershed. Sustainability, 13.
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