Credit: Korea Institute of Civil Engineering and Building Technology
Daily discharge of the Wolpo gauging station (1158.5 km2) and temporal change of vegetation cover at the four sites. Larger marks indicate measured values from aerial photos, while smaller ones indicate those from Google Earth images. Each dashed line indicates
vegetation cover estimated based on the terrestrial photos and field investigation. Green areas indicate growing seasons, while arrows indicate
the time of the photographs provided in the Figure A1.