SEA LEVEL RISE IMPACT ASSESSMENT AND MITIGATION ALTERNATIVES DEVELOPMENT FOR BALBOA ISLANDS, CITY OF NEWPORT BEACH, CALIFORNIA

Ying Poon, Brett Sanders, Randy Mason, Robert Stein

Abstract


The City of Newport Beach (City), a highly developed, densely populated coastal city in southern California is periodically subject to flooding from coincident high tides and waves. To prepare for sea level rise and potential flood damages, the City initiated a study to assess the potential flood impact to Balboa Island and Little Balboa Island. A 2D flood simulation model is utilized to investigate the effect of high tides occurring with increased sea levels, and a simple wave overtopping model is proposed to account for the effect of wind waves and ocean swells. The results of the flood model simulations were used to help the City to formulate flood inundation mitigation alternatives.

Keywords


sea level rise; coastal flooding; flood mapping; inundation modeling; wave overtopping

References


Sanders, B.F. (2008) Integration of a shallow-water model with a local time step, Journal of Hydraulic Research, 46(4) 466-475.http://dx.doi.org/10.3826/jhr.2008.3243

Schubert, J.E., Sanders, B.F. Smith, M.J. and Wright N.G. (2008) Unstructured mesh generation and landcover-based resistance for hydrodynamic modeling of urban flooding, Advances in Water Resources, doi:10.1016/j.advwatres.2008.07.012.http://dx.doi.org/10.1016/j.advwatres.2008.07.012

U.S. Army Corps of Engineers. 2009. Water Resources Policies and Authorities Incorporating Sea-Level Change Considerations in Civil Works Programs.

Veri-Tech, Inc. 2009. Coastal Engineering Design and Analysis System (CEDAS) 4.03. http://www.veritechnic.com/products/cedas/index.php.


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