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Analysis of Change Process in the Design Conditions of Harbor Breakwaters in Korea

우리나라 항만 방파제 설계조건의 변화과정 분석

  • Hong, Keun (Port & Harbor Division, Samyoung Technology Co., Ltd.) ;
  • Kang, Yoon-Koo (Coastal and Harbor Disaster Prevention Research Institute, Sekwang Engineering Consultants Co., Ltd.) ;
  • Kim, Hong-Jin (Fisheries Science & Technology Center, Pukyong National University) ;
  • Yoon, Han-Sam (Department of Ecological Engineering, Pukyong National University) ;
  • Ryu, Cheong-Ro (Department of Ocean Engineering, Pukyong National University)
  • Received : 2018.04.20
  • Accepted : 2018.06.19
  • Published : 2018.06.30

Abstract

We studied the change process in the design parameters (conditions) of structural sections of vertical/slope breakwaters in Korea over the long term based on an analytical review of the latest design recommendations. This study found the following. 1) Design wave heights have increased gradually with the increase in the wave height of deep sea waves. 2) The relative design wave height ($H_{1/3}/h$) changed from 0.5 in the 1970s to 0.6~0.7 today. This means that design wave heights are overestimated compared with the water depth. 3) Before 1999, the design water level was based on high water during an average spring tide, but this has been increased since 2000 because of additional consideration of anomalous sea levels. 4) Before 1999, the relative crest heights of the investigated breakwaters was 0.6~0.7, but after 1999 this increased to a mean of 1.0 and maximum of 1.26.

본 연구는 우리나라 방파제의 변천 과정에 대한 자료를 조사 정리 분석하였다. 그 결과를 요약하면 1) 심해설계파 재산정에 따라 설계파고가 상향되었다. 2) 수심(h)에 따른 상대설계파고($H_{1/3}/h$)의 연도별 변화는 1970년경 0.5에서 최근에는 0.6~0.7까지 증가하였다. 3) 1999년 이전에는 모든 설계에서 설계조위를 삭망평균만조위(H.W.L)를 적용하였으나, 1999년 이후부터 설계 시공일괄입찰에서 입찰자가 설계조위를 재산정하는 것이 가능해져 상향 적용하는 경향이 발생하였다. 4) 1999년 이전까지는 상대마루높이 ${\alpha}$값이 0.6~0.7 정도로 적용되었으나, 1999년도 이후 설계 시공된 방파제에서는 0.8~1.26 정도로 상향되었다.

Keywords

References

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