Abstract
In recent years, the wetland area, including Lake Utonai has been experiencing eutrophication, which is damaging its ecosystem. The cause of eutrophication is an influx of water from rivers that have been contaminated by large amounts of nutrient salt and fine sandy soil transported by an influx of water. This report will propose a water dispersion model, considering the effects of groundwater and water flow-driven by wind. The model is designed to help ascertain the exact cause of eutrophication as well as to carry out an impact assessment on these ecological problems. The proposed model is a Water Quality Dispersion Model that has been applied to a Lake Flow Model, which is made up of a Groundwater Flow Model and a Boussinesq Model, combined with Kriging. As well, it is revealed that both the inflow and outflow of groundwater have a great impact on the flow of Lake Utonai regarding the accuracy analysis of the water-quality analysis model. This result implies that it is essential to consider the inflow and outflow of groundwater as a calculation condition to ensure greater accuracy when analyzing the water flow of shallow lakes, which are connected to ground water.
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