# Reproduction of velocity and shear stress profiles in estuaries by some one-dimensional mathematical models (interim report)

Reproduction of velocity and shear stress profiles in estuaries by some one-dimensional mathematical models (interim report)

Author Faculty Department Date1981-01-01

AbstractIn this investigation the reproduction of tidal flow in channels of estuaries by means of several simple mathematical models is considered. Attention is mainly paid to velocity and shear stress profiles and to hysteresis effects of the shear stresses with respect to the surface velocity. Only one-dimensional models obtained by neglect of convective derivatives of the longitudinal velocity are considered. The models are of the eddy viscosity type, where the eddy viscosity is a prescribed function of depth and flow velocity or is dependent on the turbulence energy. Until now the prescribed eddy viscosity got most attention, but it is shown that eddy viscosities which are dependent on the turbulence energy, will not give very different results. Models with an eddy viscosity being a quadratic function of the depth and proportional to a varying velocity (e.g. the depth-averaged velocity) reproduce the velocity and the shear stress profiles in estuaries quite well. The hysteresis effect of the shear stresses, however, is much smaller than found in the few prototype measurements.

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PublisherTU Delft, Department of Hydraulic Engineering

SourceReport 2-81

Part of collectionInstitutional Repository

Document typereport

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