IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Hydrodynamics and sediment dynamics in macrotidal drainage channels and salt marshes
Hydrodynamics and sediment dynamics in macrotidal drainage channels and salt marshes
Author : RYAN P. MULLIGAN(1), LOGAN M. ASHALL(2), DANIKA VAN PROOSDIJ(3) & EMMA POIRIER(4)
ABSTRACT
In this study we use a high-resolution numerical model to examine the tidal flooding and draining of muddy channels and vegetated salt marsh flats in Minas Basin, Bay of Fundy, by comparison with field observations. The Delft3D model is used to simulate the hydrodynamics and sediment transport using a horizontal domain composed of three grids that achieve the highest resolution in the salt marsh. The model uses a flexible-stem vegetation sub-model that parameterizes low marsh (Spartina alterniflora) and high marsh (Spartina patens) plants based on a force balance according to the stem diameter, stem height and plant density with spatial variability based on Lidar topographic surveys. The results indicate that strong shallow flows occur in the drainage channels at the onset of flooding and at the end of ebb that transport high concentrations of suspended sediment of 0.2-0.4 gL-1. Including vegetation in the model causes flow over the marsh to be significantly dampened, re-directed into channels, and results in higher correlation with observations especially at higher marsh elevations. This work indicates the importance vegetation in controlling the hydrodynamics and sediment exchanges between salt marshes and tidal flats via tidal channel networks.
File Size : 944,495 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 19/08/2015
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