금왕단층 북부 홍천군 방내리 일대 고유로 지형 발달과 하각률

초록

This study aims to discuss the geomorphic development of the paleo-channel in the Bangnae-ri, located in the northern part of the Geumwang Fault, and to determine the incision depth and rate that contributed to its evolution. For this purpose, a geomorphic analysis was conducted using field surveys and LiDAR-based DEM, and quartz OSL and K-feldspar IRSL dating were performed to estimate the depositional age of the sediments. Considering scale, morphology and incision characteristics of the valley, it is inferred that the Bangnae-ri valley functioned as a paleo-channel of the Suyudong Stream but has become an abandoned channel due to incision. The incision depth that led to the valley’s abandonment is estimated to be approximately 12 m, and the incision rate, calculated from the elevation difference between the paleo-channel bed and the present streambed along with the depositional age of the paleo-channel sediments, is about 0.25 m/ka since 48 ka. This study is significant in that it reports, for the first time, the incision rate around the Geumwang Fault and is expected to provide an important basis for future research on the tectonic activity and geomorphic response of the Geumwang Fault.

키워드