Numerical Calculation on Depth-Averaged Flow Field in a Straight Stream with Vegetation Zone

Abstract

The flow with vegetation zone is rather two-dimensional, and depthaveraged analysis is available. Particularly in order to analyze the flow properties in transitional reach from the entrance of the reach with vegetation zone to the equilibrium, numerical analysis with l-equation turbulence model is developed. Once the newly introduced parameter is evaluated by comparing the calculated result with the data of the equilibrium reach, its value is still available for analyzing the transitional reach. The present method is available to predict the flow with vegetation zone for close-to-nature river improvement.