LONG-TERM EFFECTS OF DETACHED BREAKWATERS IN NANKOKU BEACH, KOCHI COAST JAPAN
Long-term effects of structures on the beach erosion control were investigated in Nankoku Beach, Kochi Coast Japan, from the viewpoint of sediment balance. Monobe River is the main sediment source to the beach though three dams decrease the sediment supply. Construction of 52 detached breakwaters was started in 1973 to prevent beach erosion and completed in 1997. One artificial reef was also constructed in 1999. In this study we looked at the long-term coastal protection effects of detached breakwaters on Nankoku Beach from the viewpoint of shoreline changes and sand movement, based on actual measurements such as work records, aerial photographs, surveying results and grain diameter surveys. Effects of the structure were analyzed by the profile data. Results show deposition on the landward side and erosion on the seaward side. It is concluded that breakwaters are effective and decrease long shore transport for the prevention of shoreline retreat though the construction started from up-drift side.
coastal erosion detached breakwaters long-term effects
Kazunori Wada Masaki Washida
Planning and Research Administration Department,Public Works Research Institute (PWRI), Japan Environmental and Hydrological Engineering Div.,Central Consultant Inc., Japan
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
1255-1260
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）