Journal ArticleDOI
Erosion and Deposition of Cohesive Soils
TLDR
In this article, the effects of shear stress, suspended sediment concentration, and shear strength of bed on the erosion rates of a cohesive bed in an open channel with salt water have been investigated.Abstract:
The effects of shear stress, suspended sediment concentration, and shear strength of bed on the erosion rates of a cohesive bed in an open channel with salt water have been investigated. The deposition rates of suspended cohesive sediment and the patterns of bed erosion have been studied to a lesser extent. For the experimental range the erosion rates were found to be independent of the shear strength of the bed and the concentration of suspended sediment. They depend strongly on the bed shear stress. The minimum shear stresses for initiation of erosion were also found to be independent of the shear strength of bed. There seems to exist a critical velocity for the clay part of suspended sediment, above which all such sediment remains in suspension, whereas even for velocities slightly below this critical limit, the suspended clay deposits rapidly. Scouring occurred predominantly within a well defined narrow and relatively straight zone near the center of the flume.read more
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Development and validation of a three-dimensional morphological model
TL;DR: The DELFT3D-FLOW module as discussed by the authors is a 3D flow solver for modeling sediment transport patterns in the water column of the DELFT-3D flow model, which is used to model both suspended and bedload transport of noncohesive sediment.
Journal ArticleDOI
Sortable silt and fine sediment size/composition slicing: Parameters for palaeocurrent speed and palaeoceanography
TL;DR: In this paper, the authors measured the size distribution of the removed component by repeated size measurement with intermediate steps of removal of components by dissolution, allowing inference of the size distributions of removed component as well as the residue.
Journal ArticleDOI
Numerical models of salt marsh evolution: Ecological, geomorphic, and climatic factors
Sergio Fagherazzi,Matthew L. Kirwan,Matthew L. Kirwan,Simon M. Mudd,Glenn R. Guntenspergen,Stijn Temmerman,Andrea D'Alpaos,Johan van de Koppel,John M. Rybczyk,Enrique Reyes,Christopher B. Craft,Jonathan S. Clough +11 more
TL;DR: A broad overview of recent numerical models that quantify the formation and evolution of salt marshes under different physical and ecological drivers is presented in this article, focusing on the coupling between geomorphological and ecological processes and how these feedbacks are included in predictive models of landform evolution.
Journal ArticleDOI
Erosion of mud/sand mixtures
Helen Mitchener,Hilde Torfs +1 more
TL;DR: In this article, the authors investigated the relationship between the erosional properties of combined mud and sand sediments, and found that adding sand to mud, or vice versa, increases the erosion resistance and reduces the erosion rates when the critical shear stress for erosion is exceeded.
Journal ArticleDOI
Erosion of soft cohesive sediment deposits
TL;DR: In this article, an experimental procedure involving layer by layer erosion under a range of bed shear stresses, τb, of successively increasing magnitude was utilized to investigate the erosion behavior of soft cohesive sediment deposits.