우리나라 다양한 저수지의 호안에서 환경 요인 분석

초록

In order to understand shoreline environment characteristics in Korean reservoirs, the interrelationships between environmental factors of geomorphology, hydrology, water quality and soil were analyzed and the reservoir types were classified according to their environmental characteristics in the shoreline of total 35 reservoirs selected by considering the purpose of dam operation and annual water-level fluctuation. Geomorphological and hydrological characteristics of reservoirs are affected by the environments of construction location and the size scale of reservoirs. The annual range of water level fluctuation showed a wide variation from 1 m to 27 m. The levels of eutrophication of most reservoirs were mesotrophic or eutrophic. From the result of the soil texture analysis, sand contents were high in reservoir shorelines. Range, frequency and duration of water-level fluctuation were distinctive from the use purpose of reservoirs. Flood control reservoirs had a wide range with low frequency and waterpower generation reservoirs had a narrow range with high frequency in the water-level fluctuation. According to the result of CART (classification and regression tree) analysis, the water quality of reservoirs was classified by water depth, range of water-level fluctuation and altitude. The result of PCA (principal component analysis) showed that the type of reservoirs was classified by reservoir size, water-level fluctuation, water quality, soil texture and soil organic matter. Therefore, the environment reservoir shoreline was primarily related to reservoir size, the water-level fluctuation and the water quality, and the shoreline soil characteristics could be a secondary important factor.