한국의 기반암 하상 침식 지형 연구
A review and new view on the study on minor erosional forms in bedrock channels in Korea
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참고문헌
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초록
포트홀로 대표되는 기반암 하상에 발달하는 다양한 침식 지형은 전문 연구자들의 연구 대상일 뿐만 아니라 일반인들에게 지형학의 학문적 중요성을 인식하게 하는 중요한 대상이다. 본 고에서는 우리나라에서 이뤄진 기반암 하상에 발달하는 지형들에 대한 연구들의 내용을 정리하고 소개하여 현황을 파악하고자 한다. 또한 기반암 하상지형의 발달과 관련된 공동현상, 굴식, 수문쐐기, 퇴적물 입자에 의한 마식 등과 같은 프로세스들과 관련된 지형들을 정리하여 소개하고자 한다. 최근에 해외 학계에서 논의되는 퍼로우, 플루트, 러넬 등과 같은 하상 지형의 특성과 형성 과정을 소개하고자 한다. 이러한 지형들은 풍화 기원의 지형들과 명확히 구분되어야 할 것으로 보인다. 또한 앞으로 우리나라의 기반암 하상 미지형 연구가 집중해야 할 과제인 하천 지형 침식 과정에 대한 기능지형학적 연구와 실험 연구의 중요성을 강조하였다. 또한 우주기원핵종을 이용한 침식률의 직접 추정과 같은 앞으로의 연구 방향을 제시하였다.
Abstract
Minor erosional forms in the bedrock river, like potholes, are not just research subject for the professional geomorphologis. In addition, these features attract general public and make them understand the social contribution and importance of geomorphologic research activities. In this paper, the studies on bedrock minor forms in Korea was reviewed. For further researches, some of major erosional processes and minor forms in bedrock rivers were discussed in detail. Cavitation, plucking, hydro-wedging, and abrasion by passing sediment particles are the major processes to create the longitudinal or transverse minor forms like pothole, furrows, flutes, and runnels. Especially the definition of furrows and runnels are explained to prevent the confusion with pothole, weathering pits and grooves. To make a progress in research on bedrock minor forms the quantitative relationship between the variables should be studied. New techniques for scientific estimation of erosion rates and exposure ages of bedrock surfaces should be used in this field.
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