Barrier Island Dynamics Using Mass Center Analysis: A New Way to Detect and Track Large-Scale Change

ISPRS International Journal of Geo-Information

Paul Paris¹ 

关键词: barrier islands;    center of mass;    geomorphology;    geographic information systems (GISs);    GRASS;    QGIS;   

DOI  :  10.3390/ijgi3010049

来源: mdpi

【 摘 要 】

A geographic information system (GIS) was used to introduce and test a new method for quantitatively characterizing topographic change. Borrowing from classic Newtonian mechanics, the concept of a body’s center of mass is applied to the geomorphic landscape, and the barrier island environment in particular, to evaluate the metric’s potential as a proxy for detecting, tracking and visualizing change. Two barrier islands along North Carolina’s Outer Banks are used to test this idea: Core Banks, uninhabited and largely-undeveloped, and Hatteras Island, altered by the presence of a protective dune system. Findings indicate that for Core Banks, the alongshore change in the center of mass is in accord with dominate littoral transport and wind conditions. Cross-shore change agrees with independent estimates for the island migration rates. This lends credence to our assertion that the mass center metric has the potential to be a viable proxy for describing wholesale barrier migration and would be a valuable addition to the already-established ocean shoreline and subaerial volume metrics. More research is, however, required to demonstrate efficacy.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland