연계 파랑류 수치모형 시스템의 개발과 이안제가 설치된 해안에 적용
A Development of Coupled Wave-Induced Current Modeling System and Its application to the Idealized Shoreline with Detached Breakwater
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초록
파랑 수치모형인 SWAN 수치모형, 파랑에 의해 발생되는 기인력 수치모형인 WIF 수치모형, 그리고 흐름장 수치모형은 EFDC 수치모형을 연동하여 최종적으로 파랑류 계산이 가능한 WIC 수치모형을 개발하였다. 개발된 WIC 수치모형을 검증하기 위하여 Goda(2000)가 적용한 수중 원형천퇴의 파랑변형 계산하여 파고, 파랑의 굴절과 회절을 비교하였으며, 파고비 결과는 약 1~5 %의 차이를 보였다. 파랑에 의한 기인력 수치모형은 기존의 Longuet-Higgins and Stewart(1960)가 제안한 잉여응력에 의해 발생하는 기인력에 Dally and Osiecki(1994)가 제안한 roller로 인한 응력에 의해 발생되는 기인력을 추가하였고, Kim(2004)이 제안한 완화기법을 도입하여 lateral mixing 처리를 수행하지 않아도 자연현상과 유사한 결과를 얻을 수 있도록 개발되었다. 개발된 파랑에 의한 기인력 수치모형은 계산시 에 제약을 받지 않는다는 장점을 가지고 있으며, 흐름장 수치모형의 source항이 되어 파랑류의 양상을 계산할 수 있도록 하였다. 연계된 파랑류 수치모형을 검증하기 위해서 Nishimura et al.(1985)의 수리모형실험과 Kim(2004)의 수심적분된 파랑류 수치모형과 비교하였다. 이안제 배후에서 연안류의 유속분포와 이안류의 유속분포 결과가 기존의 수리모형실험과 수치모형실험의 결과와 상당히 일치함이 관측되었다.
Abstract
Coupled wave induced current modeling system(WIC) was developed from combining with the nearshore spectral wave model, SWAN, the wave induced force model, WIF, and the flow model, EFDC. The reasonable results were obtained from WIC modeling system. The ratio of the wave height calculated with respect to refraction and diffraction effects over submerged spherical shoal was occurred approximately 1~5 % errors compared to Goda(2000)'s result. The radiation stress suggested by Longuet-Higgins and Stewart(1960), the stresses due to rollers in breaking waves proposed by Dally and Osiecki(1994), and Kim(2004)'s new spreading approach instead of the previous lateral mixing approach were added to calculate wave induced force. The results of the WIC modeling system show good agreement with Nishimura et al.(1985)'s laboratory measurements and better than Kim(2004)'s 2 dimensional depth averaged numerical computations for a plane beach with detached breakwater. The present flow field computed agrees reasonably well with the measured flow field. The relative merit of WIF model in WIC modeling system is unconditional stable for time increment.
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