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The disruption of sediment supply from river to coast by dam development has been a topic of global concern.In Japan,among the top 30 dams in terms of height,14 dams were constructed prior to 1970 and another 6 dams before 1980.However,the coastline erosion did not surface up as a grievous problem until the 1980s.According to the River Bureau of Japan,the overall erosion rate along the coastline of Japan was 0.72×10~6 m~2/yr prior to 1980,but sharply increased to 1.6×10~6 m~2/yr since 1980.Therefore,there was a time lag between the disruption of sediment supply by dam and beach erosion.This paper presents a case study on what may have delayed the response of beach to the effect of dam construction.
The disruption of sediment supply from river to coast by dam development has been a topic of global concern.In Japan, among the top 30 dams in terms of height, 14 dams were constructed prior to 1970 and another 6 dams before 1980.However, the coastline erosion did not surface up as a grievous problem until the 1980s.According to the River Bureau of Japan, the overall erosion rate along the coastline of Japan was 0.72 × 10 ~ 6 m ~ 2 / yr prior to 1980, but sharply increased to 1.6 × 10 ~ 6 m ~ 2 / yr since 1980.Therefore, there was a time lag between the disruption of sediment supply by dam and beach erosion.This paper presents a case study on what may have delayed the response of beach to the effect of dam construction.