Cross-Shore Numerical Model CSHORE for Waves, Currents, Sediment Transport and Beach Profile Evolution
Abstract
The majority of the world shoreline is experiencing some form of erosion, which will become more serious if the mean sea level rise accelerates because of the greenhouse effect. Nourishment and maintenance of wide sand beaches for developed coastal communities will become more expensive unless the present nourishment design method is improved by the development of a reliable morphological model. Concurrently, the recent increase of coastal storm damage necessitates s the development of numerical models for predicting the damage progression and breaching of coastal stone structures and earthen levees during extreme storms. This report summarizes the continuing effort to improve our quantitative understanding of beach morphology and structural damage progression with the goal to develop simple and robust models that are suited for engineering applications. Our effort for the last 10 years has produced the crossshore numerical model CSHORE, which is presently limited to the case of alongshore uniformity. CSHORE consists of the following components: a combined wave and current model based on time-averaged continuity, cross-shore and longshore momentum, wave action, and roller energy equations; a sediment transport model for suspended sand and bedload; a permeable layer model to account for porous flow and energy dissipation; empirical formulas for irregular wave runup, overtopping and seepage; and a probabilistic model for an intermittently wet and dry zone for the purpose of predicting wave overwash and structural damage progression.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2012
- Accession Number
- ADA568508
Entities
People
- Bradley D. Johnson
- Mark B. Gravens
- Nobuhisa Kobayashi
Organizations
- Engineer Research and Development Center