Auxiliary material for Paper 2005JF000422

High-angle wave instability and emergent shoreline shapes: 
1. Modeling of sand waves, flying spits, and capes

Andrew D. Ashton 
Division of Earth and Ocean Sciences, Nicholas School of the Environment and Earth Sciences and Center for Nonlinear and Complex Systems, Duke University, Durham, North Carolina, USA

Now at Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA


A. Brad Murray
Division of Earth and Ocean Sciences, Nicholas School of the Environment and Earth Sciences and Center for Nonlinear and Complex Systems, Duke University, Durham, North Carolina, USA

Ashton, A. D., and A. B. Murray (2006), High-angle wave instability and emergent shoreline shapes: 1. Modeling of sand waves, flying spits, and capes, J. Geophys. Res., 111, F04011, doi:10.1029/2005JF000422.

INTRODUCTION

The auxiliary material contains animations of the numerical simulations presented in 
Figure 9 of the paper.  These .avi movies show the evolution of large-scale, plan-view
shorelines.  The shorelines evolve due to gradients in alongshore sediment flux due to
breaking waves, and the shoreline features emerge due to predominance of unstable, 
high-angle waves.  The movies have been derived from the same simulations shown in
Figure 9 of the paper.

Movie domains represent a 40 km by 11 km coastal region.  The files are named using the
wave climate variables U, the proportion of high-angle waves, and A, the proportion of
waves approaching from the right, looking offshore.  Otherwise, general model parameters
are detailed in the paper.  All animations present evolution in linear time.  The file
name also tells what type of ‘end-member’ behavior exhibited in each run


FILES

1. 2005jf000422-ms01.avi
‘Alongshore sandwaves’ with A = 0.65 and U = 0.55, corresponding to the results 
presented in Figure 9b.  The animation represents 22 simulated years.

2. 2005jf000422-ms02.avi
Relatively subtle ‘cuspate bumps’ with A = 0.5 and U = 0.6, corresponding to the results
presented in Figure 9c.  The animation represents 44 simulated years.

3. 2005jf000422-ms03.avi
More pronounced, pointier ‘cuspate bumps’ with A = 0.5 and U = 0.7, corresponding to the
results presented in Figure 9d.  The animation represents 44 simulated years. 

4. 2005jf000422-ms04.avi
Relatively subtle ‘flying spits’ with A = 0.7 and U = 0.65, corresponding to the results
presented in Figure 9e.  The animation represents 22 simulated years. 

5. 2005jf000422-ms05.avi
Relatively subtle ‘reconnecting spits’ with A = 0.7 and U = 0.65, corresponding to the
results presented in Figure 9f.  The animation represents for 22 simulated years.