HR: 0800h
AN: H51D-0401    [Abstracts]
TI: Equilibrium Dynamics of Tide-dominated Ebb-tidal Deltas: A Numerical Model
AU: Swart, H d
EM: h.e.deswart@phys.uu.nl
AF: IMAU, Utrecht University, P.O. Box 80005, Utrecht, 3508 TA Netherlands
AU: Hazewinkel, J
EM: j.hazewinkel@phys.uu.nl
AF: IMAU, Utrecht University, P.O. Box 80005, Utrecht, 3508 TA Netherlands
AU: Vegt, M v
EM: m.vandervegt@phys.uu.nl
AF: IMAU, Utrecht University, P.O. Box 80005, Utrecht, 3508 TA Netherlands
AU: * Schuttelaars, H
EM: schuttelaars@geo.uu.nl
AF: Environmental Hydrogeology Group Department of Earth Sciences Faculty of Geosciences Utrecht University, P.O. Box 80021, Utrecht, 3508 TA Netherlands
AB: Ebb-tidal deltas are shallow sandy areas located on the seaward side of tidal inlets. In this contribution results are presented of experiments performed with a process-based numerical model that simulates tides, waves, sand transport and the sand balance. The focus is on tide-dominated deltas which are (nearly) spatially symmetrical with respect to the mid-axis of the inlet. It is shown that such deltas can be modeled as equilibrium solutions (steady bed level), thereby confirming a previous finding that was obatained with a highly idealized model. The present model is used to investigate the sensitivity of the characteristics of its equilibrium solutions to (potentially important) new effects that could not be accounted for in the simple model. These latter include net sand transport due to nonlinear tides, the use of a quadratic (rather than a linear) bottom stress and the use of a sophisticated (rather than a simplified) formulation to simulate waves. Model results (spatial pattern of the delta, volume of sand stored in the delta, tidal prism)will also be compared with field data.
DE: 1825 Geomorphology: fluvial (1625)
DE: 1847 Modeling
DE: 4217 Coastal processes
DE: 4460 Pattern formation
DE: 4560 Surface waves and tides (1222)
SC: Hydrology [H]
MN: Fall Meeting 2005