2011 年 17 巻 p. 53-58
Sedimentation is an essential issue on long-term management of dam reservoirs. Cost and benefit of the comprehensive sediment manage project is now a challenging issue by taking account not only keeping the reservoir capacity but also other important issues such as the improvement of downstream environment by necessary sediment supply, the effect of recycling of sediment, additional costs for downstream facilities, CO2 emission by excavating and transporting of sediment. In this study, we studied how to integrate these costs and benefits for the economic evaluation of comprehensive sediment management projects. The benefits of improving river and coastal environment were estimated by the results of CVM (Contingent Valuation Method) and Conjoint Analysis on Yahagi River. We have also proposed that preparing a stock yard in the middle river reach is a key factor to manage various objectives.
