本文旨在研究海堤坡面覆面材料之物理特性 ( 孔隙率、透水係數 ) 對海堤面波浪溯升之影響。試驗研究內容包括五種不同孔隙率之材料、五種不同透水堤之厚度，配合兩種堤面坡度及各種波浪條件，根據試驗結果分析各種波浪條件下覆面材料特性對波浪溯升之影響。
在覆面材料相對厚度在 t/d<0.2 以下可明顯看出相對溯升 ( R/H ) 隨著厚度的增加有下降的趨勢，當覆面材料相對厚度增加至0.2以上時，海堤相對溯升 ( R/H ) 受覆面材料厚度變化之影響則不大，有此可見過大的覆面材料厚度並無法更有效的減低海堤溯升，說明波浪能量僅於一定厚度內消耗。
至於孔隙率對溯升之影響，試驗結果顯示海堤相對溯升 ( R/H ) 隨著孔隙率增加而減少。當相對水深 ( d/L>0.31 )，其材料孔隙率對溯升之影響並不大，隨著相對水深 ( d/L ) 的減小，孔隙率影響就趨於明顯，由此可知較大能量的波浪，孔隙率愈大能更有效的降低相對溯升 ( R/H )。當考慮材料透水性時，試驗結果顯示海堤相對溯升 ( R/H ) 隨著透水係數 ( Kp/L2 ) 增加而減少，其趨勢大致上與覆面材料孔隙率與溯升之關係近似。

This paper is aimed to investigate the relationship between wave run-up over the seawall and the physical properties of outer-layer structure. To achieve this, a series of experimental tests were conducted. In these tests, a total of five types of porous material were disposed, respectively, on the surface of the seawall model, then wave run-up over the porous material were measured under various wave conditions. Two different seawall slopes were included, and five material thickness were adopted.
Based on experimental results, it is observed that wave run-up depends apparently on relative thickness of the porous material if the relative thickness is small than 0.2. The wave run-up decreases as relative thickness increases. However, if relative thickness becomes greater than 0.2, wave run-up would decrease no more. Therefore, it is realized that waves coming up a seawall consume their energy in the porous material only within a relative thickness of 0.2.
As for the porosity, it is indicated that the wave run-up decreases with increasing porosity, with wave run-up decreasing rate depending on relative water depth. As relative water depth decreases, the porosity would play a more important role on wave run-up over the seawall. Further, it is found that the coefficient of permeability is directly propotional to the porosity, therefore, the wave run-up also decreases as coefficient of permeability increases. Finally, formulas relating wave run-up to either porosity or permeability are suggested.

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