Spatial and temporal factors controlling short-term sedimentation in a salt and freshwater tidal marsh, Scheldt estuary, Belgium, SW Netherlands

• Published in: Earth surface processes and landforms Vol. 28; no. 7; pp. 739 - 755
• Main Authors: Temmerman, S., Govers, G., Wartel, S., Meire, P.
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.07.2003; Wiley
• Subjects: Earth sciences; Earth, ocean, space; Exact sciences and technology; freshwater marsh; Geomorphology, landform evolution; saltmarsh; Schelde river; sediment deposition; Surficial geology; suspended sediment concentration; Netherlands; Belgium; Scheldt River; Western Europe; Netherlands, Scheldt Estuary; ANE, Netherlands, Scheldt Estuary; rivers; suspended materials; time variations; fresh-water environment; salt marshes; Europe; marshes; spatial variations; sedimentation rates
• ISSN: 0197-9337; 1096-9837
• DOI: 10.1002/esp.495

During a one‐year period temporal and spatial variations in suspended sediment concentration (SSC) and deposition were studied on a salt and freshwater tidal marsh in the Scheldt estuary (Belgium, SW Netherlands) using automatic water sampling stations and sediment traps. Temporal variations were found to be controlled by tidal inundation. The initial SSC, measured above the marsh surface at the beginning of inundation events, increases linearly with inundation height at high tide. In accordance with this an exponential relationship is observed between inundation time and sedimentation rates, measured over 25 spring–neap cycles. In addition both SSC and sedimentation rates are higher during winter than during summer for the same inundation height or time. Although spatial differences in vegetation characteristics are large between and within the studied salt and freshwater marsh, they do not affect the spatial sedimentation pattern. Sedimentation rates however strongly decrease with increasing (1) surface elevation, (2) distance from the nearest creek or marsh edge and (3) distance from the marsh edge measured along the nearest creek. Based on these three morphometric parameters, the spatio‐temporal sedimentation pattern can be modelled very well using a single multiple regression model for both the salt and freshwater marsh. A method is presented to compute two‐dimensional sedimentation patterns, based on spatial implementation of this regression model. Copyright © 2003 John Wiley & Sons, Ltd.