Detecting estuarine bathymetric changes with historical nautical data and GIS

Bathymetry, the underwater equivalent of topography, is defined as the measurement of the depth of the lacustrine or oceanic Šoor from the water surface through the use of various acoustic techniques. The information on bathymetry and the change in bathymetry can be useful not only for the study of morphological evolution of seaŠoor but also for aquatic environmental planning and management (Jaffe et al. 1998; Cappiella et al. 1999; Gesch and Wilson 2002; Thomas et al. 2002; Buijsman et al. 2003; Cooper and Navas 2004; Bertin et al. 2005; Elias and Spek 2006).