Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Estimating magnitude of suspended sediment transport in ungauged east coastal zone

미계측 동해안 유역의 토사유출 규모의 평가에 관한 연구

  • Lee, Sangeun (Department of Energy and Mineral Resources Engineering, Kangwon National University) ;
  • Kang, Sanghyeok (Department of Earth Environmental System Engineering, Kangwon National University)
  • 이상은 (강원대학교 에너지 자원공학과) ;
  • 강상혁 (강원대학교 지구환경공학과)
  • Received : 2017.10.14
  • Accepted : 2017.12.03
  • Published : 2018.02.28
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Abstract

Coastal sediment archives are used as indicators of changes on shore sediment production and fluvial sediment transport, but rivers crossing coastal plains may not be efficient conveyors of sediment to the coast. In some case there is a net loss of sediment in lower coastal plain reaches, so that sediment input from an upstream exceeds the sediment yield (SY) at the river mouth. The main source of sediment in coastal area is the load from land. In Korea, data on suspended SY are limited owing to a lack of logistic support for systematic sediment sampling activities. This paper presents an integrated approach to estimate SY for ungauged coastal basins, using a soil erosion model and a sediment delivery ratio (SDR) model. For applying the SDR model, a basin specific parameter was validated on the basis of field data. The proposed relationships may be considered useful for predicting suspended SY in ungauged basins that have geologic, climatic and hydrologic conditions similar to the study area.

토사유출에 대한 자료는 극히 제한되어 있으며 이에 대한 관측지점 또한 대하천에 국한되어 있다. 더욱이 대하천 하류의 해안부근 유사량 자료는 전무한 실정이다. 본 연구는 지속적인 토사유입으로 인하여 그 면적이 줄어들고 있는 동해안의 석호인 유역면적 $8.2km^2$의 향호를 대상으로 토사량 유출량을 계산하여 유호성을 검증하였다. 그 결과 향호로 유입되는 비유사량은 약 $280t/km^2/yr$이었으며 유사전달률은 약 0.78이었다. 본 접근방법은 현재 육역화가 대부분 진행되어 있는 동해안 석호의 토사유입 과정을 유추하는데 유효한 자료가 될 것으로 기대한다.

Keywords

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