Experimental Study of Wave Reflection on A-Jack Armor Unit on Seawall Structure

In planning the construction of a seawall, it is necessary to consider several things, such as incoming waves, types defensive units, and economic factors. So for type size armor unit used, expected that structure will only experience minimal damage. addition, there are other considerations, wave reflection by structure. port area, with low needed keep anchored pool calm. this study, experimentally, effect coefficient on seawall A-Jack was carried out. The experiment held in flume regular waves variations height (0,10 – 0,175 cm) periods (1,4 seconds 1,6 seconds) three structural slope, namely 1:1, 1:1,5, 1:2. analysis out using two-point methods which were recorded probe. Based experiments, known steeper slope result more significant increase reflection. To improve accuracy spectral incident reflected record three-wave probes because two-wave probe method has weaknesses prone interference analyzing data obtained