Shimpei NAGANO 1, Masaaki WADA 2, Shuichi TANAKA 3, Masayuki FUDO 4, Akira NAGANO 5
1 The Graduate School of Future University Hakodate, Japan, 2 Future University Hakodate’s Professor, Japan, 3 Nagasaki Port Construction Association, Japan, 4 Construction Division Fisheries Infrastructure Department Fisheries Agency, MAFF, Japan, 5 All Japan Fishing Port Construction Association, Japan