Print Email Facebook Twitter Surficial sediment erodibility from time-series measurements of suspended sediment concentrations Title Surficial sediment erodibility from time-series measurements of suspended sediment concentrations: development and validation Author Mathew, R. (TU Delft Environmental Fluid Mechanics; Moffatt & Nichol) Winterwerp, J.C. (TU Delft Environmental Fluid Mechanics; Deltares) Date 2017-06-01 Abstract 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. Subject Critical shear stressErodibilityErosion coefficientFluff layerSurficial sediment To reference this document use: http://resolver.tudelft.nl/uuid:cd33b84b-6d7e-483b-a278-e276bfceb952 DOI https://doi.org/10.1007/s10236-017-1055-2 ISSN 1616-7341 Source Ocean Dynamics: theoretical, computational oceanography and monitoring, 67 (6), 691-712 Part of collection Institutional Repository Document type journal article Rights © 2017 R. Mathew, J.C. Winterwerp Files PDF art_3A10.1007_2Fs10236_01 ... 1055_2.pdf 5.44 MB Close viewer /islandora/object/uuid:cd33b84b-6d7e-483b-a278-e276bfceb952/datastream/OBJ/view