고창 연안 퇴적물의 입도 특성을 이용한 홀로세 퇴적층 퇴적 환경 분석
Assessment of Holocene Sedimentary Environment Using Particle Size Characteristics of Coastal Sediments in the Gochang Area
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초록
This study aimed to analyze the origin of core sediments in the Gochang coastal area and to trace the inflow pattern of sediments generated by storm surge events during the Holocene. According to grain size characteristics, tidal flat with beach sediments, coastal dune sediments, and weathered bedrock soils were categorized in accordance with surface sediments of the current coastal area. Based on these data, source analysis and tempestite tracking were performed through SB3 borehole, and the associated deposition timings were determined using radiocarbon dating. Results confirmed that the SB3 borehole was located in an environment (1) where sediments originating from weathered bedrock soils in the terrestrial area were constantly supplied and (2) where sediments originating from coastal dunes were supplied by episodic storms. Moreover, the main source and contribution ratio could be indirectly determined by analyzing the grain size characteristics of the tempestite. In particular, the three tempestites on the top were deposited around 200 ~ 300 years ago, corresponding to the Little Ice Age. Thus, it could be confirmed that the powerful extreme events during the Little Ice Age period influenced the sedimentological history of the Gochang coastal area.
Abstract
This study aimed to analyze the origin of core sediments in the Gochang coastal area and to trace the inflow pattern of sediments generated by storm surge events during the Holocene. According to grain size characteristics, tidal flat with beach sediments, coastal dune sediments, and weathered bedrock soils were categorized in accordance with surface sediments of the current coastal area. Based on these data, source analysis and tempestite tracking were performed through SB3 borehole, and the associated deposition timings were determined using radiocarbon dating. Results confirmed that the SB3 borehole was located in an environment (1) where sediments originating from weathered bedrock soils in the terrestrial area were constantly supplied and (2) where sediments originating from coastal dunes were supplied by episodic storms. Moreover, the main source and contribution ratio could be indirectly determined by analyzing the grain size characteristics of the tempestite. In particular, the three tempestites on the top were deposited around 200 ~ 300 years ago, corresponding to the Little Ice Age. Thus, it could be confirmed that the powerful extreme events during the Little Ice Age period influenced the sedimentological history of the Gochang coastal area.
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