FOCUSING ON IONS IN OGOCHI RESERVOIR CATCHMENT AREA ANALYSIS OF EFFECTS ON WATER QUALITY IN WATER CONSERVATION FOREST

Abstract

 Reservoirs, which have various roles other than being a water source, are closed spaces that are greatly affected by the quality of water from incoming rivers and rainwater from the surrounding forest soil. The forest's water source recharge function plays various roles such as storage of water resources, flood mitigation, and purification of water quality, and forest management is essential to obtain high-quality raw water for water supply. In this study, the relationship between vegetation data, dissolved ions in the inflow river, and the constituent elements of forest soil was analyzed by comparing them with the state of the forest to clarify the relationship between them. Furthermore, principal component analysis was conducted using data on dissolved ions in the inflow rivers of the Ogochi Reservoir to compare water quality from one inflow river to another to clarify the characteristics and properties of the catchment area of each inflow river, and to propose a water source forest management method for better raw water supply.