Estimating Sedimentation Rates Near Chesapeake Bay and Delmarva Peninsula and the Associated Implications for Survey Priorities

TitleEstimating Sedimentation Rates Near Chesapeake Bay and Delmarva Peninsula and the Associated Implications for Survey Priorities
Publication TypeConference Abstract
Year2018
AuthorsBongiovanni, C
Secondary AuthorsLippmann, TC, Calder, BR, Armstrong, AA
Conference Name2018 Fall Meeting, American Geophysical Union (AGU)
Conference LocationWashington, DC
Conference DatesDecember 10-14

Assessing the validity of survey data and charted information over time has yet to be standardized.  NOAA's current approach, the Hydrographic Health Model (HHM), is a risk-based methodology aimed at determining hydrographic survey priorities.  The HHM incorporates a number of important maritime variables including heuristic changeability terms based on the seabed sedimentary material, occurrence of large storms, tidal currents, and anthropogenic obstructions.  We propose an alternative approach that leads to a quantifiable estimate of chart health through estimation of sedimentation and erosion rates from successive bathymetric surveys, sediment cores, and numerical modeling.  This can identify rapidly degrading regions relative to acceptable variability pre-defined using IHO standards.  These modifications are evaluated in the central east coast of the U.S. (Chesapeake Bay and Delmarva Peninsula) where frequent hydrographic surveys are required to monitor significant sediment transport in heavily trafficked regions.  This work not only identifies current and future survey priorities but also creates a link between hydrodynamic models and hydrographic survey priorities.

URLhttps://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/460950
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