IAHR Document Library

« Back to Library Homepage « Proceedings of the 2nd IAHR Europe Congress (Munich, 2012)

Vertical Variation in Diffusion Coefficient Within Fixed Bed River Sediments

Author(s): Ian Chandler; Jonathan Pearson; Ian Guymer; Rogerv An-Egmond

Linked Author(s): Ian D. Chandler, Ian Guymer

Keywords: No Keywords

Abstract: This paper presents experimental results quantifying the vertical variation in diffusion coefficients with depth below the sediment-water interface for one flow and sediment combination. A modified EROSIMESS-System has been used in conjunction with fibre-optic fluorometers to determine the variation. The diffusion coefficient reduces exponentially with depth below the sediment-water interface in two repeat tests with 1. 85mm diameter sediment under a bed shear velocity of 0. 02m/s. There is a discrepancy between the upper most coefficients calculated from the in-bed data and those calculated from the bulk exchange measurement in the water column.


Year: 2012

Copyright © 2023 International Association for Hydro-Environment Engineering and Research. All rights reserved. | Terms and Conditions