| Virginia
Journal of Science.
2007. Vol 58 (1) : 17-26 |
| High
Resolution Dune Complex Mapping for the Monitoring of Coastal Landform
Change, First Landing State Park, Virginia George M. McLeod, Department of Ocean, Earth, and Atmospheric Sciences, Old Dominion University, Norfolk, VA 23529 Joe Daigneau, Engineering and Environment, Inc., 195 South Rosemont Road, Virginia Beach, VA 23452 James Collins, Department of Political Science and Geography, Old Dominion University, Norfolk, VA 23529 Norma Swan, Department of Political Science and Geography, Old Dominion University, Norfolk VA 23529 Thomas R. Allen, Department of Political Science and Geography, Old Dominion University, Norfolk, VA 23529 ABSTRACT
First Landing State Park is located on the southern
shore of the mouth of the Chesapeake Bay. The park contains a
prograding shoreline and dune complex that has been steadily growing
northward. Accurate three dimensional mapping of the resident coastal
dune features is challenging due to the dynamic nature of the
dunescape. Precise mapping within First Landing was accomplished
through careful planning, employ of advanced Global Positioning System
(GPS) technology, and intensive data analysis. Mapping ensued during a
period of optimal satellite signal availability and
strength. Data points were collected at manual intervals
with a Leica GS50+ GPS receiver, utilizing real-time kinematic (RTK)
corrections from ground control stations. Vertical data accuracies of
less than 5cm were achieved. Horizontal accuracies were near 1cm. The
resultant data was interpolated to create realistic contour maps,
triangulated irregular networks (TINS), and raster elevation models of
the study area. The methods employed may be replicated at
standard time intervals for the purpose of establishing a database to
maintain an inventory of dune features within First Landing. Temporal
changes in this inventory may be monitored to illustrate rates of
change and illuminate conditions that may require management
intervention. |