Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Numerical Model for Predicting Sand Bar Formation around River Mouth

하구역의 사주 형성 예측을 위한 수치 모델

  • Kuroiwa, Masamitsu (Department of Civil Engineering, Graduate School of Engineering, Tottori University) ;
  • Matsubara, Yuhei (Department of Civil Engineering, Graduate School of Engineering, Tottori University) ;
  • Suzuki, Yoko (Department of Civil Engineering, Graduate School of Engineering, Tottori University) ;
  • Kuchiishi, Takayuki (IDEA Consultants, Inc.)
  • Received : 2014.12.05
  • Accepted : 2014.04.29
  • Published : 2014.04.30
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Abstract

A three-dimensional beach evolution model was presented to predict morphodynamics around a river mouth. The presented model was based on the depth-averaged (2DH) and quasi three-dimensional (Q-3D) nearshore current modules, and the model took into account shoreline changes, the effect of advection diffusion of suspended load and discharged sediments from the river. First, the 3D beach evolution model was applied to the formation of sand spits and terrace at the river mouth in order to investigate the performance of the model. Secondly, the model was applied to the river mouth at the Ara River, facing the Sea of Japan. The formation of sand spit at the Ara River in winter season was reproduced. The computed result showed qualitatively agreement with field site observation.

하구역의 지형변화를 예측하기 위해 3차원 해빈 변형 모델을 통한 계산이 수행되었다. 본 모델은 수심적분을 기초로 한 준 3차원 연안흐름 모듈로 구성되며, 해안선의 변화, 부유사의 이송-확산 효과를 고려할 수 있다. 우선 모델의 성능을 확인하기 위해 3차원 해빈 변화 모델이 하구역 사주 형성에 적용되었다. 다음으로 동해에 인접한 Ara 강 하구에 모델이 적용되었다. Ara 강의 사주의 동계 변화가 재현되었으며 계산결과는 현장 관측 결과와 좋은 일치를 나타냈다.

Keywords

References

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  1. Two new conceptual models for the formation and degradation of baymouth spits by longshore drift and fluvial discharge (Iguape, SE Brazil) pp.01979337, 2017, https://doi.org/10.1002/esp.4279