2006 Volume 19 Issue 3 Pages 189-204
A field in this study is located in the eastern part of Hokkaido Tomakomai City, and it is Lake Utonai where it registers for Ramsar Convention in 1991. In the Lake Utonai, the influence on ecosystem becomes a problem by the transportation of nutrient salts, and fine sediment from the inflow river. Because the depth of water is shallow, flow inside the lake takes an influence by the sea-land wind of the near Pacific coast geographically, and it is expected to take the influence of the groundwater around the lake. Firstly this report arranged about local characteristic and sediment characteristic of Lake Utonai, Secondly inspection by reproduction calculation considering effects of the groundwater flow and sea-land wind and estimated an accumulation point of a tracer particle by a water quality model with Lagrange technique. Furthermore, set ingredient correlation of flow direction and vertical direction by two-dimensional vertical flow analysis model. The lakebed change analysis that the amount of sedimentation of vertical direction was adopted more than that result is being enforced, and examined comparison and analysis with distribution area and sedimentation point of the fine sediment about Lake Utonai. In this result, confirmed local application in Lake Utonai, and the simulation model that developed in this study clarified a sediment tendency.
