A Two-Dimensional Simulation of Flow Field in Lakes under Wind Acting on the Water Surface and the Impact of Aquatic Plants on the Flow Patterns

概要

論文の詳細を見る
Circulation in lakes, which is primarly caused by wind shear acting on the water surface, is one of the key issues in the field of water environment. Therefore, simulating wind-induced flows in lakes is great of significance. The objective of this research is to build a two-dimensional, unsteady, katerally averaged model for simulating field in lakes. The main foundation of the model is the incompressible Navier-Stokes equations for two dimensions laterallr and vertically. In this research, these equations were discretized by the infinite volume method (FVM), and were solved for flow field velocities by the SIMPLE (Semi-Implit Method for Pressure-Linked Equations) algorithm (Patanlar, 1980) with the variables defined on a space- staggered grid. To solve these equations effectively, a numeral method has been developed by using the Tri-Diagonal Matrix Algorithm (TDMA), and software program has been coded in Fortran 90 (Nyhoff and Leedtma, 1997;1999) to implement the algorithm. To vertify the model, Tabiishidani lake was chosen as a case study. Tobiishidani lake's cross-section size and meteorologocal data were observed and used as the boundary conditions for the model. After coding, the model was used to simulate the wind-induced flow patterns in the lake under the different areas covered by aquatic plants on the water durface.
九州大学の論文