Deriving Frictional Parameters and Performing Historical Validation for an ADCIRC Storm Surge Model of the Florida Gulf Coast

Atkinson, J., H. Roberts, S.C. Hagen, S. Zhou, P. Bacopoulos, S. Medeiros, J. Weishampel and Z. Cobell (2011), “Deriving Frictional Parameters and Performing Historical Validation for an ADCIRC storm surge model of the Florida gulf coast,” Florida Watershed Journal, Vol. 4. No. 2, Spring 2011, pp. 22–27.

Updates are in process for FEMA’s Digital Flood Insurance Rate Map (DFIRM) for three Florida coastal counties - Wakulla, Jefferson, and Franklin - that are subject to flooding from hurricane-driven storm surge. To assess the statistical frequency of inundation for the coastal counties, a finite element computer model, Advanced Circulation Model (ADCIRC), is used to simulate storm surge flooding for a large number of hurricane scenarios. This article is a companion to other articles in this issue that discuss aspects of the modeling developed for FEMA in the study region. One of the important components of modeling flood inundation from hurricane storm surge is to correctly model the surface roughness characteristics in the region of interest. The following provides details on the development of the frictional inputs for the ADCIRC model and an example from the surface model validation.