山形県飛島における貯水ダムへの流入特性

概要

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The Island of Tobishima, Yamagata Prefecture, has seven small-scale multi-purpose dam reservoirs whose storage capacities are within the range of 1,470 to 17,320m^3. These render great service to the eradication of inherent water scarcity. No or insufficient rain during a dry spell of summer to autumn, however, often causes serious droughts and water shortages. Thus effectively collecting rainwater gifted on their watershed is a sheer need to perennially meet the water demand. In this paper, in order to provide basic knowledge for forest preservation or treatments that are effective means for water conservation, inflow characteristics of the reservoirs are investigated. The run-off reduction curves for the watersheds selected are derived through regarding the increased reservoir water during a no-rain spell as run-off water from the watershed. In addition, by use of the data obtained from field tests, the potential infiltration is evaluated for both the forest soil and the dry-field soil. The results invite us to the conclusion that forestations and reforestations in all possible areas including non forest ones are needed for enhancement of water conservation as well as erosive soil protection.
日本雨水資源化システム学会の論文