Three-dimensional model for estuarine turbidity maxima in tidally dominated estuaries: An idealized modeling approach

Development and Extension of An Aggregated Scale Model: Part 1 – Background to ASMITA

Whilst much attention has been given to models that describe wave, tide and sediment transport processes in sufficient detail to determine the local changes in bed level over a relatively detailed representation of the bathymetry, far less attention has been given to models that consider the problem at a much larger scale (e.g. that of...

Macrophytes in estuarine gradients: Flow through flexible vegetation

Aquatic plants –or macrophytes- are an important part of coastal, estuarine and freshwater ecosystems worldwide, both from an ecological and an engineering viewpoint. Their meadows provide a wide range of ecosystem services: forming a physical protection of the shoreline, enhancing water quality and harbouring many other organisms. Unfortunately...

Estuarine Ecosystem Engineering: Biogeomorphology in the estuarine intertidal

The aim of this thesis was to investigate how (macro)benthic organisms interact with the ecological functioning, erodibility and small- to medium-scale morphodynamics of estuarine intertidal sediment by modulating its composition and/or properties. In these interactions, scale is of great importance for the ecosystem engineers. The changes they...

Effect of bottom stress formulation on modelled flow and turbidity maxima in cross-sections of tide-dominated estuaries

A three-dimensional numerical model with a prognostic salinity field is used to investigate the effect of a partial slip bottom boundary condition on lateral flow and sediment distribution in a transect of a tidally dominated channel. The transect has a symmetrical Gaussian cross-channel bottom profile. For a deep, well-mixed, tidally dominated...

Modeling equilibrium bed profiles of short tidal embayments: On the effect of the vertical distribution of suspended sediment and the influence of the boundary conditions

In many tidal embayments, bottom patterns, such as the channel-shoal systems of the Wadden Sea, are observed. To gain understanding of the mechanisms that result in these bottom patterns, an idealized model is developed and analyzed for short tidal embayments. In this model, the water motion is described by the depth- and width-averaged shallow...

A new morphological schematization of the Western Scheldt estuary, The Netherlands

The present paper describes an analysis of the morphological integrityof the multiple channel system (MCS) of the Western Scheldt estuary. The tidal flats and surrounding ebb and flood channels form morphological cells, and the entire MCS can be schematized as a chain of such cells. The major ebb and flood channels have lost their one time...

Tidal asymmetry and residual sediment transport in estuaries

Theoretical study on tidal asymmetry and application to the Westerschelde estuary.

Description of the turbulence measurements conducted in the tidal channel "Groote Gat" (Ems/Dollard) in 1995 and 1996

In 1993 an interdisciplinary research programme on the behaviour of mud in tidal waters was initiated by the Board of NWO-BOA. The programme aims at obtaining more detailed insight in the dominant processes that govern the transport behaviour of mud. These processes have strong time variability and therefore the general approach is to obtain...

The Ems/Dollard estuary: A physical system description

In 1993 an interdisciplinary research programme on the behaviour of mud in tidal waters was initiated by the The Board of NWO-BOA. The programme aims at obtaining more detailed insight in the dominant processes that govern the transport behaviour of mud. These processes have strong time variability and therefore the general approach is to obtain...

Estuarine Muds manual

This report is an update of the working manual part of 'The hydraulic engineering characteristics of estuarine muds' Report No SR77, December 1986, made in the light of research conducted at Hydraulics Research Ltd (HR) and invited comments received from end users in the industry. A considerable research programme has been undertaken by HR since...

Measurement equipment and techniques used in studying radionuclide movement in the Columbia river estuary

Columbia River estuary is being conducted by the U.S . Geological Survey. The necessity for information on water discharge, suspended and bed sediments, and radioactivity prompted the development of new measurement techniques and equipment suitable for estuarine conditions. Flow velocities and directions throughout the entire depth at a single...

Shell dredging as a factor in estuarine sedimentation

During the past few decades, industrial demands for buried shell have been rapidly increasing. Highway construction, the petrochemical industries, and cement manufacturers are among the major users of shell. Semi-fossil oyster shell is found in tidal embayments in deposits of varying thickness and is dredged from depths varying from two or three...