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Journal of the Korean Society of Hazard Mitigation 2013;13(4):273-278.
Published online August 31, 2013.
수중천퇴상에서 규칙파 및 일방향 불규칙파의 전파변형에 대한 실험
이종인, 김영택
Experiments for Wave Transformation of Regular and Uni-directional Irregular Waves over a Submerged Shoal
Jong-In Lee, Young-Taek Kim
Abstract
Laboratory experiments are conducted to study transformation of water waves propagating over a submerged elliptic shoal in a basin. Incident waves are both regular and uni-directional irregular waves. For non-breaking wave conditions over the center of the shoal, a focusing of waves is observed at the rear side of the shoal. The measured relative heights of regular waves are greater than those of uni-directional irregular waves. Under breaking condition, the relative wave heights are small at the center of the shoal, while they are large relatively at laterals. Around the center of the shoal, the measured wave heights of uni-directional irregular waves are larger than those of regular waves because of the small wave height components of the irregular waves.
Key Words: laboratory experiment; elliptic shoal; regular wave; uni-directional wave; breaking
요지
타원형 수중 천퇴상을 통과하는 파랑에 대해 규칙파 및 일방향 불규칙파를 적용하여 전파변형에 대한 평면 수리실험을 수행하였다. 천퇴 중앙부에서 쇄파가 발생하지 않는 조건에서는 천퇴 후면에서 파랑의 집중이 나타났고, 규칙파의 상대파고가 일방향 불규칙파의 경우보다 크게 계측되었다. 쇄파조건에서는 천퇴 중앙부에서의 상대파고는 낮고, 측면에서 높게 나타났다. 그리고 비쇄파조건과는 달리 쇄파조건에서는 일방향 불규칙파의 상대파고가 규칙파 조건보다 크게 계측되었으며, 이는 불규칙파 성분중 저파고 성분에 기인한다.
핵심용어: 수리실험; 타원형 천퇴; 규칙파; 일방향 불규칙파; 쇄파
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