Research on Improvement of Functions of Existing Dams Using Hydrological Forecast Information

本研究旨在提出现有多用途水坝的防洪及用水改善措施。大坝的功能将通过从用水能力暂时转变为防洪能力，从防洪能力暂时转变为用水能力、环境恢复能力和小水力发电能力来增强。由于未来气候变化带来的突发洪水和干旱，以及难以开发新的设施，因此改善现有设施的功能是一种有效的措施。前者是指在汛期预报时，通过提前放水来提高防洪能力的操作；后者是指在正常水量之外保留水量用于小型水力发电等的操作。这两种方法都要求对大坝水库的降雨和入库水量进行准确的预测，并提出了利用这些信息改善大坝功能的措施。

This study aims to propose improvement measures of flood control and water use for existing multi-purpose dams. Functions of dams will be enhanced by temporary change of a capacity from water use to flood control, while that from flood control to water use as well as environmental recovery and small hydro-power. Improvement of functions of the existing facilities gives a promise as an effective measure because unexpected flood and drought due to future climate change are expected as well as new facilities are difficult to be developed.The former means an operation to enhance the flood control capacity by prior releasing from dam reservoir when flood is predicted, while the latter means an operation to keep more water than the normal capacity for water use for utilization to small hydro-power etc. Both are required an accurate prediction of rainfall and inflow to dam reservoir, thus improvement measures of dam functions using such information were proposed.