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Characteristics of step-pool structure in the mountain streams around Mt. Jiri

지리산 주변 산지하천의 step-pool 구조 특성

Ki Heung Kima
,
Hea Reyn Junga
김 기흥a
,
정 혜련a
aDepartment of Civil Engineering, Gyeongnam National University of Science and Technology
a경남과학기술대학교 토목공학과
*교신저자. *Corresponding Author. 
30 April 2018. pp. 313-322
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Abstract

The height of the steps was almost the same as the grain size of bed materials and increased with channel slope. The step widths and step wavelengths are almost the same size, and the step wavelength was decreased when the channel slope was increased. It was analyzed that there was a clear correlation between channel width and step width, and the step width increases with channel width. In addition, the step wavelength was scaled by channel width, and the step height is governed by the grain size of the rock forming the step, so that the profile structure of the step-pool was changed according to the channel slope. the scale of the pool was found to be highly correlated with the channel width, grain size, and slope gradient. Therefore, the characteristics of step-pool structure in mountain streams were influenced by various factors, but it can be explained as the grain size, channel width and channel slope.

Keywords
Step width
Step height
Step wavelength
Pool width
Pool length
Scour depth

Step의 높이는 하상재료 입경의 크기와 거의 같은 상관관계가 있으며, 하도경사에 따라 증가하고, 하도 폭과 step 파장은 거의 같은 크기로서 하도 경사가 증가하면 step 파장은 감소하는 것으로 분석되었다. 하도 폭과 step 폭은 뚜렷한 상관관계가 있으며, 하도 폭의 증가에 따라 step 폭도 증가 하는 것으로 분석되었다. 또한, step 파장은 하도 폭에 의하여 규모가 정해지고, step 높이는 step을 형성하는 암석의 크기에 의해 지배되기 때문에 step-pool의 종단면의 하상구조는 하도경사에 따라 변화하는 것으로 판단된다. Pool의 규모는 하도 폭, 입경 및 하도경사와 상관성이 큰 것을 확인 하였다. 따라서 하천의 step-pool 구조 특성은 다양한 인자들의 영향을 받지만 대표적으로 입경, 하도 폭 및 하도경사로서 설명할 수 있는 것으로 분석되었다.

키워드
Step 폭
Step 높이
Step 파장
Pool 폭
Pool 길이
세굴심
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 51
  • No :4
  • Pages :313-322
  • Received Date : 2017-12-26
  • Revised Date : 2018-01-09
  • Accepted Date : 2018-01-11
  • DOI :https://doi.org/10.3741/JKWRA.2018.51.4.313
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