CROSS-SECTIONAL STABILITY OF ESTUARY CHANNELS IN THENETHERLANDS

F. Gerritsen, H. de Jong, A. Langerak

Abstract


In this paper, stability characteristics of tidal channels of the Western Scheldt and of the Wadden Sea are compared. The Western Scheldt is a major estuary in the southern part of the country and is the only remaining open sea-arm in that area after construction of the Delta Project. The Wadden Sea is situated in the northern part of the country and the inlets form the connection between the North Sea and the Wadden Sea. Stability parameters used for the comparison are the maximum discharge, Qmax, the Flood Volume FV (of Tidal Prism) and the mean tidal velocty, . It appeares that linear trends can be established between the cross-section and the various stability parameters, for each of the two systems, but that the regressionrelationship is not the same. Attempts have been made to develop a universal relationship by introducing a dimensionless stability parameter, in which the dominating hydraulic characteristics are combined. The results are interesting but further research is required to refine this method. The established morphological relationships can be used to predict the changes in channel equilibrium when external changes in the estuary system are introduced. For the Western Scheldt the one-dimensional numerical tidal model IMPLIC will be combined with distinct morphological relationships for the estuary to be used as a predictive tool for the new equilibrium situation created by dredging works.

Keywords


cross-sectional stability; estuary channel; estuary; channel stability; Netherlands

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