Abstract
Pocket beach width, length of headlands on both sides of pocket beach, relative location of river mouth, basin area of 24 rivers pouring into the pocket beach were investigated through the case study in Tottori and Hyogo Prefectures facing the Sea of Japan. It is found that rivers flow into the sea in the adjacent area of headlands independent of the scale of rivers because of wave dissipation effect due to the headlands. Relative berm height formed by wave run-up at the center and end of the pocket beach is given by Zs1 / Zs2= (Hb1/Hb2) 5/8. This shows that parallel jetty method is not enough and is required to dissipate wave energy at the river mouth using some device such as artificial reef in the river mouth improvement of small rivers.
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