CAJ | 학술논문

潜堤是防止海岸侵蚀的常用护岸建筑物,准确的掌握潜堤前后波浪的传播变形规律十分必要.该文以斜坡上梯形潜堤为研究对象,基于波浪水槽实验,通过谱分析探求线性波、非线性波、非规则波通过斜坡上潜堤内部组成能量的变化规律,分析相同的入射波情况下波浪倍频能量演变与堤顶水深大小的关系,得出堤顶水深越小主频能量衰减越大的规律.同时,比较研究线性波与非线性波作用下潜堤前后波能的变化,发现非线性波高倍频能量产生更加剧烈.
잠제시방지해안침식적상용호안건축물,준학적장악잠제전후파랑적전파변형규률십분필요.해문이사파상제형잠제위연구대상,기우파랑수조실험,통과보분석탐구선성파、비선성파、비규칙파통과사파상잠제내부조성능량적변화규률,분석상동적입사파정황하파랑배빈능량연변여제정수심대소적관계,득출제정수심월소주빈능량쇠감월대적규률.동시,비교연구선성파여비선성파작용하잠제전후파능적변화,발현비선성파고배빈능양산생경가극렬.
Submerged breakwaters have become increasingly popular due to their multiple functions, which are to protect shoreline or harbor and to prevent beach erosion in the coastal zones. In this paper submerged breakwater in the coastal zones was modeled in a wave flume. The experiment was outfitted with a servo-hydraulically actuated wave-maker at one end and a sloping bottom (slope=1:20) at other end for modeling water motion in the coastal region. Wave elevation measurements were made by using capacitance-type wave probes. Basic experiments are conducted on linear waves, nonlinear waves and irregular waves propagating over trapezoidal-type submerged breakwater on a sloping bed in the wave-flume. Based on wave spectrum analysis, the evolution of the wave energy through the submerged breakwater was investigated. Analyzing the relation between the depth of submergence and the characteristics of wave energy, the results of that fundamental energy decreases as the depth of submergence increases, the wave profile becomes strongly asymmetry and wave energy in lower harmonic is transferred into higher harmonic are presented. Under the linear and nonlinear waves, the changes of wave energy between before and after the submerged breakwater are shown that harmonic waves exhibit different.