Determine the best management practice of agricultural non-point source under RCP scenario in South Korea

Abstract:

In order to secure the health of the water ecosystem, non-point source pollution has recently been cited as one of the important factors for controlling water quality in Korea. According to a 2010 government report, non-point source pollutants accounted for about 68.3 percent of the total pollutants in an average, of which land pollutants and livestock pollutants corresponding to agricultural non point source pollutants accounted for about 83 percent of the total non-point source pollutants. Moreover, agricultural non-point source pollution is expected to be difficult to manage due to changes in rainfall due to climate change, as rainwater in the event of rainfall.

Therefore, this study establishes a scenario for the formation of a vegetation zone to prevent spillage from non-point source pollution into rivers, and identifies the effect of reducing non-point source pollution according to each scenario. In addition, the purpose of the study is to check the change in the discharge of non-point source pollutants according to climate change and to identify the reduction measures to maintain water quality in future climates using RCP scenario.

The target area of this study is Korea's Saemangeum basin, where agricultural activities such as wide rice paddies and fields are active. Scenarios are established for the formation of vegetation between regions and streams where agricultural activity occurs, and water quality before and after the scenario is compared using the APEX-SWAT linked model. In addition, using rainfall by RCP scenarios, we propose preventable scenarios for future changes in water quality.