Suwannachai, L.; Sriworamas, K.; Sivanpheng, O.; Kangrang, A. Application of SWAT Model for Assessment of Surface Runoff in Flash Flood Areas. Water2024, 16, 495.
Suwannachai, L.; Sriworamas, K.; Sivanpheng, O.; Kangrang, A. Application of SWAT Model for Assessment of Surface Runoff in Flash Flood Areas. Water 2024, 16, 495.
Suwannachai, L.; Sriworamas, K.; Sivanpheng, O.; Kangrang, A. Application of SWAT Model for Assessment of Surface Runoff in Flash Flood Areas. Water2024, 16, 495.
Suwannachai, L.; Sriworamas, K.; Sivanpheng, O.; Kangrang, A. Application of SWAT Model for Assessment of Surface Runoff in Flash Flood Areas. Water 2024, 16, 495.
Abstract
In addition to changes in the amount of rain, changes in land use upstream are considered a factor that directly affects the maximum runoff flow in a basin, especially in areas that have experienced floods and flash floods. This research article presents the application of the SWAT model to assess runoff in areas that have experienced flash floods, in order to analyze the proportion of land use change to the maximum runoff. Study areas that had experienced flash floods were in 3 basins in Thailand (Lam Saphung Basin, Phrom River Basin, and Chern River Basin Part 1 which is a subbasin of the Nam Chi River Basin). This study analyzed two main factors that influence runoff in the river basin: Changes in rainfall and changes in land use by considering 2 simulation situations.: (1) Changes in land use affecting runoff assessed by considering land use maps in 2006, 2008, 2010, 2015, 2017, 2019, and 2021 when using rainfall data only in the year 2021 for all cases, and (2) Changes in the amount of rainfall influencing runoff by considering the rainfall record in 2006, 2008, 2010, 2015, 2017, 2019, and 2021 when using the land use data only in the year 2021 for all cases. The results of the study found that the SWAT model can be effectively applied to estimate annual runoff in areas that have experienced flash floods under 8 parameters with R2 values of 0.74, 0.82 and 0.74 for the Lam Saphung River Basin and the Phrom River Basin and the Chern River Basin Part 1 respectively. In addition, it was found that the proportion of land use changes that involved changes from forest areas to residential areas was the greatest from 2008 to 2010 in the Phrom River Basin and Chern River Basin Part 1. This resulted in an increase in the maximum runoff amount of 77.78% and 46.87%, respectively. When land use was constant, it was found that the rainfall in 2010, which was the highest, also had the greatest impact on the runoff in all 3 areas.
Keywords
Flash Flood Area; Runoff; SWAT; Land Use Change; Rainfall Runoff
Subject
Engineering, Civil Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
