Measurements of Erosion of Undisturbed Bottom Sediments with Depth

McNeil, J.; Taylor, Catherine; Lick, Wilbert

doi:10.1061/(asce)0733-9429(1996)122:6(316)

Cited by 160 publications

(106 citation statements)

References 6 publications

Supporting

Mentioning

105

Contrasting

Order By: Relevance

“…The results of the entrainment flux method provide a starting point to parameterize the critical shear stress of the fluff layer within the numerical model. Empirical methods such as Sedflume (McNeil et al 1996) or based on soil mechanical properties (Winterwerp et al 2012) can be used to determine the critical shear stress of the more consolidated bed underneath the fluff layer.…”

Section: Discussionmentioning

confidence: 99%

Surficial sediment erodibility from time-series measurements of suspended sediment concentrations: development and validation

Mathew

Winterwerp

2017

Ocean Dynamics

View full text Add to dashboard Cite

Numerical models of fine sediment transport depend on different approaches to parameterize the erosion properties of surficial sediment strata. These properties, namely the critical shear stress for erosion and the erosion rate coefficient, are crucial for reproducing the short-term and long-term sediment dynamics of the system. Methods to parameterize these properties involve either specialized laboratory measurements on sediment samples or optimization by model calibration. Based on observations of regular patterns in the variation of suspended sediment concentrations (SSC) over the tidal cycle in a small, narrow estuary, an alternate approach, referred to as the entrainment flux method, for quantifying the erosion properties of surficial bed strata is formulated and applied. The results of this method are shown to be analogous to the erosion data used to formulate the standard linear erosion formulation developed by various authors. The erosion properties inferred from the entrainment flux method are also compared to direct measurements of erodibility on sediment samples from the same site using the Gust microcosm apparatus. The favorable comparison of the two approaches suggests that the entrainment flux method can be used to infer and quantify the erodibility of surficial sediment strata in similar small and narrow estuaries. This method has certain advantages, chiefly its ease of implementation and the fact that it uses SSC time series which would typically be expected to be available for the study of or for model application at a given site. Guidelines for selecting the appropriate dataset for the application of the method are also presented.

show abstract

Section: Discussionmentioning

confidence: 99%

Surficial sediment erodibility from time-series measurements of suspended sediment concentrations: development and validation

Mathew

Winterwerp

2017

Ocean Dynamics

View full text Add to dashboard Cite

show abstract

“…Most recently, many other apparatus have been developed primarily to measure sediment erosion. The devices of these types can be named as the Sedflume, the ASSET flume and Erosion Function Apparatus etc [1][2][3].…”

Section: Previous Development Of Erosion Apparatusmentioning

confidence: 99%

“…By means of Sedflume, erosion rates could be measured in the laboratory and field at high shear stresses. It had been used to measure erosion rates of relatively undisturbed sediments in the field [1]. In contrast, the Sedflume measures pure erosion that is scour of bed sediment into suspended load and bed load and subsequent transport of these loads downstream with negligible possibility of deposition in the test section.…”

Section: Previous Development Of Erosion Apparatusmentioning

confidence: 99%

“…For an example, considerable work has been done to determine what controls bedload transport capacity from flume experiments [e.g. [1][2][3]] but very few focused on how bed roughness and grain sizes vary in response to the variation of sediment supply [e.g. [4,5]] and how vertical grain interchange among bed surface and bedload happens during sediment movement [6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrodynamic investigation of fluvial sediment transport with Soil Protrusion Apparatus (SPA)

Jayaratne

Salim

2014

Open Engineering

View full text Add to dashboard Cite

Abstract:In order to understand sediment transport process based on knowledge of their soil properties and hydrodynamic behaviour a series of 2D laboratory controlled small-scale experiments were conducted using the Ahlborn sediment mobile bed tank (4.0×0.6×0.2 m). Experiments were conducted in smooth and rough bed conditions with purposely-built Soil Protrusion Apparatus (SPA) to measure the basic parameters on which erosion depends. Sediment deposition patterns in equilibrium stage associated with different bed roughness and particle size distributions were fundamentally investigated. Extended physical modelling of crescent zones also included analysing their grain size distribution. Dimensional analysis and multiple linear regression methods were employed to derive a simple empirical relationship for erosion rate (ER) in terms of the shear stress (τs), average grain diameter (d 50 ) and soil protrusion (z) for smooth and rough sediment bed conditions. These analyses also suggest ways to refine empirical models, examining transport rates to explore the limits of erosion and deposition influences in shallow flow conditions.

show abstract

“…Therefore, different laboratory and in situ devices have been developed to measure the critical shear stresses and/or erosion rates (e.g., [6][7][8][9][10][11][12][13]). For the large majority of these erosion devices, determination of fine sediment stability is restricted to the surface layer.…”

Section: Introductionmentioning

confidence: 99%

Combining Field and Laboratory Measurements to Determine the Erosion Risk of Cohesive Sediments Best

Noack

Gerbersdorf

Hillebrand

et al. 2015

Water

View full text Add to dashboard Cite

Abstract:In contrast to non-cohesive sediments, the incipient motion of cohesive sediments is characterized by much more complex interactions between several sedimentary, biological, and chemical parameters. Thus, site-specific investigations are required to obtain information about the erosion stability of cohesive materials. This becomes even more relevant for contaminated sediments, stored in riverine sediments as a "burden of the past", because of their remobilization potential during flood events. This article represents a twofold measuring strategy for the detection of erosion thresholds: an in situ device for determination of critical shear stresses in the field, and a laboratory approach where sediment cores are withdrawn and subsequently analyzed over depth. The combined measuring strategy was applied in the River Elbe and at selected sites of the catchment of the River Saale. The results show a great variety of erosion thresholds over depth, demonstrating the need to conduct vertical analyses, especially when addressing buried layers with contaminations. The latter is only possible in the laboratory but the in situ device revealed clear benefits in capturing the loose flocculent layer on top of the sediment that might be easily lost during sediment retrieval and transport. Consequently, it is ideal to combine both approaches for a comprehensive insight into sediment stability. OPEN ACCESSWater 2015, 7 5062

show abstract

Measurements of Erosion of Undisturbed Bottom Sediments with Depth

Cited by 160 publications

References 6 publications

Surficial sediment erodibility from time-series measurements of suspended sediment concentrations: development and validation

Surficial sediment erodibility from time-series measurements of suspended sediment concentrations: development and validation

Hydrodynamic investigation of fluvial sediment transport with Soil Protrusion Apparatus (SPA)

Combining Field and Laboratory Measurements to Determine the Erosion Risk of Cohesive Sediments Best

Contact Info

Product

Resources

About