한반도 중부 동해안 석호 및 주변 유역의 지형특성과 하구부 퇴적환경

Abstract

Landscape around river mouths reflects a series of process that the eroded valley during the LastGlacial Maximum showed the maximum area at transgression as drowned valley and has been aggraded untilthe recent. Development and aggradation process of coastal lagoon, a representative landform in the EastCoast of Korea, has a close relationship to basin characteristics, and coastal lagoon has scarcity value asunfilled natural lake and high geomorphic value. This study investigates basin characteristics such as river lengthand basin area, and sedimentary environment at river mouths of 33 river basins including the major 7 lagoonsin the East Coast, Gangwon Province. In order to understand the geomorphic value of coastal lagoon andestablish the long-term conservation strategy, we classify sedimentary environment of the river mouths at eachbasin into stage of aggradation. Stage I and II, which is lagoon or has the highest possibility of lagoon, is 13rivers and has 4~15km of river length and 3~40km² of basin area. Stage III of 13 rivers, which is aggraded,but was lagoon until the recent time, has 7.48~19.50km of river length and 15.05~76.49km² of basin area.Aggradation of the river mouth proceeds from stage I, II to stage III, IV, and V. Stage I~ III has 27 rivers withthe range of lagoon and marsh is suggested as representative environment of river mouths along the MiddleEast Coast in the Korean Peninsular.