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Research Article

Effective power for interrill erosion by rainfall-induced sheet flow

강우유발 면상흐름에 의한 세류간 침식에 대한 유효동력

Seung Sook Shina
,
Sang Deog Parkb*
신 승숙a
,
박 상덕b*
aResearch Center for River Flow Impingement and Debris Flow, Gangneung-Wonju National University
bDepartment of Civil Engineering, Gangneung-Wonju National University
a강릉원주대학교 수충부 및 토석류 방재기술연구단
b강릉원주대학교 토목공학과
* Corresponding Author
31 August 2018. pp. 665-676
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Abstract

Interrill erosion on a hillslope results from the combined action of the detachment of soil particles by raindrop impact and the sediment transport of surface runoff. This study newly defined the rainfall power which detaches soil particles and the sheet-flow power contributed to sediment transport in terms of energy expenditure rate of soil erosion and presented the effective power equation for interrill erosion by rainfall-induced sheet flow. The rainfall and sheet-flow power was evaluated by factors related with rainfall, slope, and runoff and coefficients of the power equation were analyzed based on references. Futhermore it was confirmed that the relative scales between the rainfall power and the sheet-flow power according to rainfall intensity reflect on the hydrological response and physical process of interrill erosion. From application of the field data for surface runoff and soil erosion it was verified that the rainfall and sheet-flow power is an appropriate equation to estimate a interrill erosion.

Keywords
Rainfall power
Sheet-flow power
Interrill erosion
Rainfall intensity
Surface runoff

사면에서의 세류간 토양침식은 빗물방울의 지표면 타격에 의한 토양입자의 박리와 면상흐름에 의한 토사이송의 상호작용에 의한 결과이다. 본 연구는 토양입자를 박리하는 강우동력과 유사이송에 기여하는 면상흐름동력을 토양침식을 위한 에너지 소비율 측면에서 새롭게 정의하고, 강우유발 면상흐름에 의한 세류간 토양침식의 유효동력 함수를 제시하였다. 강우, 경사, 유출과 관계된 인자들에 따른 강우 ․ 면상흐름의 동력을 평가하고, 기존 연구 자료를 바탕으로 이 함수의 상수들을 분석하였다. 또한 강우와 면상흐름 동력의 상대적인 크기 변화는 세류간 토양침식의 물리적 과정과 수문학적 반응을 반영함을 확인하였다. 지표유출 및 토양침식 실측자료를 세류간침식 평가 모형들에 적용한 결과 강우 ․ 면상흐름동력 함수가 가장 높은 정확도를 보여 세류간 토양침식 평가에 적합하다는 것을 확인하였다.

키워드
강우동력
면상흐름동력
세류간침식
강우강도
지표유출
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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 :8
  • Pages :665-676
  • Received Date : 2018-03-16
  • Revised Date : 2018-05-16
  • Accepted Date : 2018-05-16
  • DOI :https://doi.org/10.3741/JKWRA.2018.51.8.665
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