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Understanding salt-marsh accretion,Scolt Head Island,Norfolk, England |
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| Authors: | David R Stoddart Denise J Reed Jonathan R French |
| Institution: | 1. Department of Geography, University of Cambridge, England 3. Louisiana Universities Marine Consortium, 70344, Chauvin, Louisiana 4. Department of Geography, University of Cambridge, England |
| Abstract: | Measurements of surface sediment accretion have been obtained for Hut Marsh, Scolt Head Island, Norfolk, England, using sand marker horizons. More than eighty 1-m2 marker sites were deployed in October 1983, and vertical accretion measured at them in April and October 1986 and April 1987. Elevations relative to Ordnance Datum were established by levelling each site at the time of deployment. Data collected by Steers between 1935 and 1957 on the same marsh show a clear relationship between marsh elevation and sedimentation. The results of the current more detailed study, presented as mean annual accretion rates, indicate a complex pattern of sediment distribution at this macrotidal location. These data, together with the results of tidal flow monitoring in the creeks on Hut Marsh, show the importance of spatial and temporal patterns of sediment delivery and variations in depositional processes in determining the distribution of sedimentation across the marsh surface. |
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