カリフォルニア州ヴェンチュラ海岸の海岸侵食とダム堆砂の除去に関する一考察

抄録

Beach erosion of the Ventura coast in California was investigated by field observation. On this beach, located on the downcoast of the Ventura River mouth, where eastward longshore sand transport dominates, beach erosion was triggered by the obstruction of continuous sediment supply from the Ventura River by the construction of Matilija Dam. Removal methods of deposited sediment in upstreamregion of this dam, and their effects and influences to the riverbed and the coastline were discussed in Sand Right '99 symposium held in Ventura. This study summarizes the results of this symposium as wellas the results of field observation, and future measures in Japan are discussed through the comparison.