Magnitude of Hurricane Ike storm surge sedimentation: implications for coastal marsh aggradation

There is a paucity of information on the regional distribution and magnitude of hurricane storm surge sedimentation. This study assesses the spatial extent and magnitude of Hurricane Ike's (2008) storm surge sedimentation and discusses implications for the role of hurricanes in marsh aggradation. The characteristics of the storm surge deposit, including thickness, inland penetration, volume and mass, were determined for 15 transects across marshes bordering the Gulf of Mexico in south-eastern Texas and south-western Louisiana. The deposit is up to 0.85?m thick, extends up to 3.6?km inland, and has an estimated volume of about 13.7 million m3 and an estimated mass of about 16.2 million metric tons. This level of sedimentation is one to two orders of magnitude larger than other potential sources of marsh sedimentation, including annual riverine inputs and inputs from alongshore sediment transport. The study findings add support to a growing body of evidence that hurricanes may be the predominant sediment source for long-term aggradation of many coastal marshes bordering the Gulf of Mexico. Copyright (c) 2012 John Wiley & Sons, Ltd.