Sedimentary processes on a sandy shoal in a mesotidal estuary (Oosterschelde, The Netherlands)
Kohsiek, L.H.M.; Buist, H.J.; Bloks, P.; Misdorp, R.; van den Berg, J.H.; Visser, J. (1988). Sedimentary processes on a sandy shoal in a mesotidal estuary (Oosterschelde, The Netherlands), in: de Boer, P.L. et al. (Ed.) Tide-influenced sedimentary environments and facies. Extended versions of papers presented at the Symposium on Classic Tidal Deposits, held August 1985 in Utrecht, Netherlands. pp. 201-214 In: de Boer, P.L. et al. (Ed.) (1988). Tide-influenced sedimentary environments and facies. Extended versions of papers presented at the Symposium on Classic Tidal Deposits, held August 1985 in Utrecht, Netherlands. D. Reidel Publishing: Dordrecht. ISBN 90-277-2622-1. ix, 530 pp., more |
| Authors | | Top | - Kohsiek, L.H.M.
- Buist, H.J.
- Bloks, P.
| - Misdorp, R.
- van den Berg, J.H.
- Visser, J.
| |
| Abstract | During 14 months the current velocity, current direction, waves and sand transport were measured at two locations on a sandy shoal (Galgeplaat) in the Oosterschelde estuary. As well as the hydraulic data, sedimentation and erosion rates were measured each fortnight at 35 location for 26 months. These data have been evaluated with respect to sand transport relative to the measured sedimentation and erosion rates. The morphological development of the Galgeplaat depends on changes in the suspended sand transport. Bedload transport is almost absent. There are no megaripples on the intertidal part of the shoal. In this respect the sand transport processes on the Galgeplaat resemble those on tidal flats. The suspended sand transport characteristics are closely related to the neap-spring tide cycle. The transport rate at neap tides is insignificant, but during spring tides there is a net transport towards the shoal. These regular neap-spring tide sand transport characteristics are disturbed by storms. During storms the total sand transport in a flood-ebb cycle increases by 3 to 8 times, while the net sand transport is mainly directed off the shoal. The pattern of sand transport is in agreement with the measured sedimentation and erosion rates. Erosion takes place during storms, whereas sedimentation occurs during spring tide, fair weather conditions. The erosion rates vary widely in space, being most directly related to the wind direction, and thus the wave direction, during a storm. |
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