Journal of the Korean Geographical Society (대한지리학회지)

The Korean Geographical Society (대한지리학회)
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Morphometric Characteristics of Alluvial Fans in South Korea and Comparisons with those of Japan, Taiwan and the Philippines

한반도 남부 선상지의 계량적 지형 특성과 일본, 타이완, 필리핀 선상지와의 비교 연구

  • Yoon, Soon-Ock (Department of Geography and Research Institute for Basic Sciences, Kyung Hee University) ;
  • Saito, Kyoji (Dept. of Geography, Saitama University) ;
  • Hwang, Sang-Ill (Department of Geography, Kyungpook National University) ;
  • Oguchi, Takashi (Center for Spatial Information Science, The University of Tokyo) ;
  • Tanaka, Yukiya (Department of Geography and Research Institute for Basic Sciences, Kyung Hee University)
  • Received : 2010.04.13
  • Accepted : 2010.07.07
  • Published : 2010.08.31
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Abstract

The morphometric characteristics of 13 alluvial fans in the southern parts of the Korean Peninsula are studied and relationships between their distributions and causes are discussed by comparing them with 690 alluvial fans in Japan, Taiwan and the Philippines. The relationships between the surface gradient of alluvial fans and source basin area, the surface gradient and the relief ratio of the source basin, and the source basin area and the relief ratio were investigated. The alluvial fans in South Korea have typical characteristics of the Asian fans, although their frequency and density are relatively low, and the size and the relief ratio of their source basins are relatively small and steep, respectively. Moreover 36 major Korean river basins without alluvial fans tend to have lower altitude and relief ratios. Contrary to the argument by Blair and McPherson, the natural depositional gaps on the gradient of alluvial fans were not found. The Gyeongju alluvial fan is probably a fluvial fan with gentle gradient, whereas the other Korean fans seem to be debris-flow related on the base of their gradients.

한반도 남부 13개 선상지를 일본, 대만, 필리핀의 690개 선상지와 비교, 분석하였다. 선상지 경사와 함양역 면적, 선상지 경사와 함양역 기복비, 선상지 면적과 함양역 면적, 그리고 함양역 면적과 함양역 기복비와의 관계를 정량적으로 검토한 결과, 한반도 남부의 선상지는 아시아의 선상지 특성과 잘 부합되지만, 선상지 빈도와 밀도가 낮다. 또한 선상지 하천의 함양역 규모가 작고, 기복비가 커서 선상지 규모가 작고 경사가 급하다. 36개 주요 하천 곡구부에서 선상지가 형성되지 않는 것은 상대적으로 낮은 산지고도와 함양역의 기복비 때문이다. 한국의 선상지에서는 Blair and McPherson이 주장한 지형면 경사의 공백을 확인할 수 없으며, 경주 선상지는 경사가 완만한 하성 선상지의 가능성이 높다.

Keywords

References

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