Comparison of Models for Single-thread Streamsby Yasuyuki Shimizu, Hokkaido Development Bur, Japan,
J. Dungan Smith, Hokkaido Development Bur, Japan,
Jonathan M. Nelson, Hokkaido Development Bur, Japan,
Abstract: A variety of two- and three-dimensional models for flow in curved channels and rivers have recently been made available for engineering use, and the question arises as to how sophisticated a model must be for various classes of stream flow problems. We compare the results of three different hydrostatic flow models to data from (a) a flume experiment in a 270°C circular bend with a rectangular cross-section and (b) a natural meander with bar-pool topography. Two of the models are quasi-three-dimensional and the third is fully three-dimensional. The flume experiment is that of Kikuchi, Ikeda, and Yamasaka , and the field measurements are those of Dietrich and Smith [1983, 1984]. We find that the fully three-dimensional model is required to represent accurately the flow in the circular bend, whereas the simplest quasi-three-dimensional model works as well as the other two for the natural stream.
Subject Headings: Three-dimensional models | Hydraulic models | Three-dimensional flow | Hydrologic models | Mathematical models | Channel flow | River flow | Model accuracy
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