Using Computational Fluid Dynamics To
Investigate The Effect Of A Marram Covered
Foredune: Initial Results
Author(s)
S. J. Wakes, M. Hilton, K. Dickinson & T. Maegli
Abstract
New Zealand coastal dune systems have been invaded by Marram grass
(Ammophila arenaria) over the last 50 years. This is thought to have had a
significant effect on the ecosystem biodiversity and coastal geomorphology.
Care needs to be taken if eradication is to be undertaken that the dune systems
are not unstabilised and more problems are caused. Marram grass was originally
planted as a sandbinder and has created massive foredunes on exposed coasts
Cooper [1], Wiedemann and Pickart [2] and Elser [3] that has major implications
for the geomorphic development of transgressive dune systems. Little work has
been done to study the impact of these foredunes on the development of
downwind dunes.
Initial work is being undertaken to model the flow over a particular coastal
dune system at Mason Bay, Stewart Island, New Zealand with a typical marram
covered foredune with a transgressive parabolic dune downwind. Previous work,
Hart et al [4], has compared a two-dimensional slice of the topography as of
2003 (marram) and 1958 (pre-marram) numerically to understand the pattern of
wind on the foredune and more importantly in the deflation zone. This paper
compares Computational Fluid Dynamic (CFD) modelling of the existing
topography with experimental wind measurements. Emphasis will be on the
validation of the numerical model data. The protocol needed in taking account of
the roughness of the different surface coverings over the surface will be
discussed. Validation of two-dimensional transects through the dune complex
will inform the resulting three-dimensional model. A protocol for modelling in
the future will be ascertained in terms of roughness values to use dependent on
vegetation present, mesh size, turbulence model to use and domain size.
Keywords
Related Book
Other papers in this volume
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