Abstract
Lake Biwa is the largest lake in Japan and is the origin of the Yodo River which supplies drinking water to 12 × 10 6 people and industrial water to the economic center of western Japan. Recently, serious environmental problems, especially eutrophication, have become evident in Lake Biwa. This paper treats the eutrophication of Lake Biwa as a dynamic process related to nutrient, mainly nitrogen and phosphorus influx, and the effect this influx has on aquatic ecosystems, water quality and the internal nutrient cycle. For purposes of simplification, Lake Biwa has been treated as a five-block system consisting of three geographical blocks and two of which are divided into two layers. The main objectives of the research reported in this paper are to construct a dynamic eutrophication model of Lake Biwa and to provide basic information for the future exploration of water quality management.
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