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연안침식 대응기술 개발을 위한 2차원 개별요소법의 적용성에 관한 연구 원문보기

  • 저자

    정연명

  • 학위수여기관

    경상대학교 대학원

  • 학위구분

    국내석사

  • 학과

    해양토목공학과 수공학

  • 지도교수

    허동수

  • 발행년도

    2014

  • 총페이지

    93 p.

  • 키워드

    two-way coupled numerical model Discrete element method Coastal erosion;

  • 언어

    kor

  • 원문 URL

    http://www.riss.kr/link?id=T13534318&outLink=K  

  • 초록

    Coastal erosion is a natural process that occurs through the wave action around beach. but reckless coastal construction(coastal roads, coastal structures) caused affecting coastal erosion. could see a sudden increase of coastal erosion in the years to past in korea. Also every year white sands and shoreline is undermined. Therefore, In order to prevent erosion of coastal which is part of the country losses from high-waves coastal structure were constructed. Therefore, this study performs numerical simulation two type reduction technology(submerged breakwater, drainage layer) and wave energy dissipation characteristic of vegetation zone for reducing coastal erosion. This is to reproduced the behavior of element particle using a coupled numerical model with LES-WASS-2D(Hur and Choi1) and Discrete element method as a two-way method in 2-D wave field. First of all, two-way coupled numerical model is suggest by compare Validation and validity from results of experiment. The discrete element method is analyzed comparing to the experimental result of existing numerical model for repose angle for verification. In the result, the water repose angle is well implemented. This confirms the validity and effectiveness of the suggested discrete element method. The suggested numerical model is analyzed comparing to the experimental result of existing numerical model for sediment transport rates for verification. In the result, the water level and sediment transport rates from slope angle is well implemented. Also, the suggested numerical model is analyzed comparing to the experimental result of existing numerical model for wave damping of vegetation zone for verification. In the result, the reflection and transmission coefficients is well implemented. This confirms the validity and effectiveness of the suggested numerical model. A good agreement has been obtained by the comparison between the existing experimental results and two-way coupled numerical model results for the wave energy dissipation(reflection and transmission coefficient) of vegetation zone. From the invented two-way coupled numerical model with which the validity and effectiveness of the existing repair experiments were examined, this research showed that the suggested sway motion of vegetation successfully reenacted. Furthermore, suggested numerical model verification is performed by comparing suggested condition of vegetation as a measure wave damping of vegetation zone. The considered condition of vegetation performed better effect when the height and width of zone was increased, that performed better effect when the gap of zone was decreased. Also, this study numerical model verification is performed sediment deposition and topographic change in coastal by comparing suggested condition submerged breakwater of structure and condition of drainage layer as a measure sediment transport rates. The suggested structure performed better effect when the width and detached distance of submerged breakwater was increased, that performed better effect when the crest depth of submerged breakwater was decreased. The suggested structure performed better effect when the diameter and porosity of drainage layer was increased, that performed better effect when the depth of drainage layer was decreased.


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