Distribution of stream incision rate in the Southern Sobaek Mountain Range

This study tried to reveal the distribution of incision rate and its causes in the Southern Sobaek Mountain Range, with OSL age dating and topographic analysis for fluvial terrace and fanlike terrace deposits. The northern slope of Jirisan (1,915 m) showed the highest incision rate and the incision rate decreased with distance from the northern slope. The incision rate indicated the most relevant with the distance from the inferred uplift axis, suggesting that ground uplift was the most important factor for the distribution of incision rate in the study area. The incision rates to the eastern and western directions showed similar decreasing patterns, indicating that the study area experienced the symmetric uplift. It was also suggested that the study area experienced similar or slightly lower uplift compared to that in the Northern Taebaek Mountain Range and higher uplift than the Northern and Middle Sobaek Mountain Ranges.