Tidal flow separation at protruding beach nourishments

In recent years, the application of large-scale beach nourishments has been discussed, with the Sand Motor in the Netherlands as the first real-world example. Such protruding beach nourishments have an impact on tidal currents, potentially leading to tidal flow separation and the generation of tidal eddies of<br/>length scales larger than the...

Tidal Flow Separation at the Sand Motor

This study investigates the existence and character of tidal flow separation at the Sand Motor, a mega-scale sand nourishment at the Delfland coast. Tidal flow contracts at the tip of the Sand Motor, downstream the tip the flow diverges and flow separation could occur. In case of flow separation the diverging streamlines cannot follow the...

Observations of barrier island length explained using an exploratory morphodynamic model

Barrier coasts display a chain of islands, separated by tidal inlets that connect a back-barrier basin to a sea or ocean. Observations show that barrier island length generally decreases for increasing tidal range and increasing basin area. However, this has neither been reproduced in model studies nor explained from the underlying physics. This...

Getijasymmetrie in de Westerschelde: Een ID model onderzoek naar invloed van geometrie op getijasymmetrie

Om de relatie tussen geometrische eigenschappen van het dwarsprofiel en getijasymmetrie te onderzoeken zijn twee eendimensionale modellen gebouwd waarin het systeem is geschematiseerd tot een een-geul systeem: 1) een simpel prismatisch model met uniforme geometrie in langsrichting en 2) een complex model dat een schematisatie is van het gehele...

Het verjaagde water, de getijbeweging op Walcheren en de caissonsluitingen in 1945/1946

Because of the allied bombing of Walcheren in 1944 the island suffered from a number of breaches. These breaches were closed in the period 1944-1945. The closures have been described by A. den Doolaard in his novel "Het Verjaagde Water". For the closure Phoenix caissons have been used from the Mulberry harbours build during the allied landings...

The feasibility of implementing radiating boundary conditions in Triwaq

This report describes a method for radiating disturbances generated in the computational field through the radiating boundaries. First a simulation is made without disturbances (such as a storm surge) subsequently a second simulation is made with the radiating boundary conditions activated, and the disturbance is able to pass through the...

Sand transport on the shoreface of the Holland coast. The Dutch coast. Paper No. 5

Experiments and computations on unsteady separating flow in an expanding flume

An unsteady, separating flow with a free surface was investigated with a physical model and a numerical model. To simulate tidal flow, the prescribed flow rate at the inflow boundary was a half-period sine function of time. Measurements of velocities and wave heights were conducted by using LDV and a wave-height meter in a straight open channel...

Simulation of main flow and secondary flow in a curved open channel

Knowledge of the secondary flow is essential for predictions about the morphology of alluvial bottoms in tidal channels. In this research the determination of the secondary flow is based on a known depth averaged velocity field. The depth averaged velocities must be computed with a high accuracy in order to make possible a reasonable...

Terminal do Seixal- Hydro morphological study, additional work

Siderurgia Nacional EP has planned to construct an ore terminal nearby Seixal (Portugal) and to dredge an access channel and turning basin in the southern part of the Tagus Inner Estuary. In the Hydronamic report, entitled Terminal do Seixal, Hydro-Morphological Study, February 1982/ P457' the hydraulical, nautical and morphological consequences...

Manuscripten van H.J. Schoemaker uit de periode 1946-1971: Deel C: Getijden, Getij-reproductie en Getij-analyse

C1: Getijstromen in zee (1962) C2: Roterende coördinatiesystemen; centrifugale kracht en Coriolis-kracht1 (1958) C3: Invloed van aardrotatie bij waterloopkundig onderzoek² (1958) C4: Roterende cylinder in een parallelstroom tussen twee evenwijdige wanden (1958) C5: Reproduction of geostrophic effects in hydraulic models by means of the Magnus...

Closure of estuarine channels in tidal regions

Considerations on fluid motion in and around closure gaps, two-dimensional local scour in loose sediments, local scour caused by vortex streets, behaviour of dumping material when exposed to currents, results of model tests applied to an actual project *** The closure of the final gaps is the most difficult part of the construction of the dams...

Analogy between tides and AC electricity

Description how tidal flow can be simulated using an electric analogon (analog computer)