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동해 울릉분지의 사면안정성 및 쇄설류 퇴적체의 발달

Slope Stability and Development of Debris Flow Deposit in the Ulleung Basin, East Sea

자원환경지질 = Economic and environmental geology, v.50 no.2, 2017년, pp.129 - 143  

이선종 (충남대학교 해양환경과학과) ,  이정민 ((주)한국해저정보) ,  유동근 (한국지질자원연구원 석유해저연구본부) ,  이고은 (충남대학교 해양환경과학과) ,  박수철 (충남대학교 해양환경과학과)

초록
AI-Helper 아이콘AI-Helper

동해 울릉분지 남서부의 천부퇴적층은 대부분 사면사태와 쇄설류 퇴적체로 구성되어 있으며 주로 사면붕괴에 의해 야기된다. 따라서 쇄설류 퇴적체에 대한 연구는 지질재해 및 해저면의 안정성을 연구하는 측면에서 중요한 의미를 갖는다. 본 논문에서는 다중빔 음향측심자료를 이용하여 울릉분지의 흐름집적도 및 사면붕괴 취약성도를 작성하였다. 또한, 탄성파 탐사자료를 활용하여 동해 울릉분지의 최상부층에 존재하는 쇄설류 퇴적체의 분포 및 특성을 연구하였다. 사면붕괴 취약성도는 사면붕괴를 야기하는 각 요소별(경사, 경사방향, 곡률 그리고 수류력지수) 빈도비로 계산되었다. 이러한 결과는 동해 울릉분지의 남쪽과 서쪽 대륙사면에서 사면붕괴가 발생할 확률이 높은 것을 지시해준다. 사면붕괴로 야기되는 퇴적체의 흐름(쇄설류)은 사면기저부를 거쳐 울릉분지의 북서쪽 및 북쪽지역으로 수렴하고 있음을 보여준다. 탄성파 자료 분석에 의하면 연구지역의 최상부층에 분포하는 쇄설류 퇴적체는 총 4개의 퇴적단위로 구분된다. 이러한 퇴적단위의 분포는 흐름집적도와 사면붕괴 취약성도와 연계되어 발달하고 있는 것으로 보인다.

Abstract AI-Helper 아이콘AI-Helper

The shallow sediments in the southwestern Ulleung Basin consist of mass flow deposits such as slide/slump and debris flow deposits (DFD), caused by slope failure. These sediments are proven to be important in studying geological disaster and stability of the seafloor. In this paper, we analysised th...

주제어

질의응답

핵심어 질문 논문에서 추출한 답변
대규모의 사면붕괴 및 질량류가 야기하는 것은? 대규모의 사면붕괴 및 질량류는 쓰나미(Tsunami)와 같은 지질재해를 유발하여 인명 및 재산피해를 입힐 수 있을 뿐만 아니라 원유시추시설이나 해저송유관 등의 해저시설물에 직접적인 손상을 야기한다. 남아프리카 아굴하즈와 파푸아뉴기니에서 발생한 해저사태는 많은 피해를 발생시킨 재해로 기록되었다(Dingle, 1977; Yoshiaka et al.
질량류 퇴적체는 무엇에 의해 주로 발생되는가? 질량류는 천부 퇴적물을 심해저로 운반하여 퇴적분지를 채우는 해양 퇴적환경의 중요한 메커니즘 중 하나이다. 일반적으로 질량류 퇴적체는 대륙붕단이나 협곡의 상부에 축적된 불안정한 상태의 퇴적체가 무너져 하부로 흐르는 사면붕괴(Slope failure)에 의해 주로 발생되며 다양한 중력구동 작용에 따른 대량의 퇴적물 이동으로 야기된다(Bonnie et al., 1979).
쇄설류 퇴적체에 대한 연구가 지질재해 및 해저면의 안정성을 연구하는 측면에서 중요한 의미를 갖는 이유는? 동해 울릉분지 남서부의 천부퇴적층은 대부분 사면사태와 쇄설류 퇴적체로 구성되어 있으며 주로 사면붕괴에 의해 야기된다. 따라서 쇄설류 퇴적체에 대한 연구는 지질재해 및 해저면의 안정성을 연구하는 측면에서 중요한 의미를 갖는다.
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선택된 텍스트