@mastersthesis {1828,
	title = {Detecting Bedform Migration from High Resolution Multibeam Bathymetry in Portsmouth Harbor, New Hampshire, USA},
	volume = {Earth Sciences/Ocean Mapping},
	year = {2009},
	month = {09/2009},
	pages = {107},
	school = {University of New Hampshire},
	address = {Durham, NH},
	abstract = {<p>A study was undertaken to quantify dune migration in Portsmouth Harbor, New Hampshire, USA from repeat high-resolution multibeam echosounder (MBES) surveys. Repeat MBES surveys were conducted in June 2007 and July 2008 over periods ranging from 6 hours to 7 days in order to capture the response of dune morphology to ebb-flood and spring-neap tidal cycles. A new technique was developed for detecting bedform migration. This approach utilizes a fingerprint-detection algorithm (Bishnu et al., 2002) to convert the bathymetric surface to a binary map of bedform crests, which are subsequently tracked using a spatial cross-correlation technique (Duffy and Hughes-Clarke, 2005). Acoustic current-meter observations from July 2008 provided context for the observed bedform-migration patterns, and were subsequently used to compute bed shear stress. Results indicate that dune migration occurred over periods as short as 6 hours. Dune migration distances in excess of 2 m were observed over 6- and 7-day periods.\&nbsp;</p>
},
	keywords = {bedform migration, portsmouth harbor},
	author = {Felzenberg, Janice}
}
