Extending a 1-line modeling approach to explore emergent coastline behaviors

Conference Paper

Previous work treating shoreline change arising from alongshore sediment transport as a diffusion of shoreline shape has been in error. When the effects of nearshore refraction on breaking-wave characteristics are included, analyses show that shoreline diffusivity varies with deep-water wave characteristics, and that the traditionally used value for shoreline diffusivity is not correct. For sufficiently oblique wave-approach angles, diffusivity becomes negative. As we expand on here, analysis in terms of deep-water wave characteristics shows that a negative diffusivity will occur for common wave-approach angles. Thus, the effects of this instability are likely to be important for many shorelines. Investigating the consequences of this fundamental aspect of shoreline change using a simple numerical model requires important modifications to the 1-line modeling approach, as we detail here. When diffusivity is negative, nonphysical discretization artifacts will appear in such a model unless the algorithm is designed specifically to avoid these artifacts. In addition, the algorithm must be designed to handle model complications related to emergent shoreline structures.

Full Text

Duke Authors

Cited Authors

  • Murray, AB; Ashton, A

Published Date

  • April 1, 2005

Published In

Volume / Issue

  • 2005-January /

Start / End Page

  • 2035 - 2047

International Standard Serial Number (ISSN)

  • 0161-3782

International Standard Book Number 13 (ISBN-13)

  • 9789812562982

Digital Object Identifier (DOI)

  • 10.1142/9789812701916-0163

Citation Source

  • Scopus