MORPHOLOGICAL EVOLUTION OF A STABILIZED TIDAL INLET AND IMPLICATIONS FOR COASTAL INFRASTRUCTURE VULNERABILITY

Liliana Velasquez-Montoya,Elizabeth J Sciaudone,Margery F Overton,Michael Dunn

doi:10.9753/icce.v36v.sediment.3

Abstract

Evolutionary patterns of a tidal inlet and its adjacent barrier islands are identified via 10 years of remotely sensed data, hydrographic surveys, and a morphological numerical model. A cyclical geometric adjustment of the inlet to dredging of its navigation channel indicates that the system is in stable equilibrium. The inlet has been experiencing a counterclockwise rotation likely caused by the growth of a spit and the presence of a terminal groin that restricts the inlet migration. As this rotation continues, the southernmost flood channel has been encroaching into the downdrift back barrier. Continued erosion along the estuarine shoreline could increase the vulnerability of an existing coastal roadway from the estuarine side.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/DCee7MlQkGI

Highlights

The location of tidal inlets in the interface between oceans and estuaries makes them strategic areas that provide economic and environmental services at local and regional scales
STUDY AREA Oregon Inlet is a dynamic tidal inlet located in the Outer Banks of North Carolina, USA
Oregon Inlet migrated to the south until its down drift shoulder was stabilized with a terminal groin in 1991 (Fig. 1)

Summary

Introduction

The location of tidal inlets in the interface between oceans and estuaries makes them strategic areas that provide economic and environmental services at local and regional scales. STUDY AREA Oregon Inlet is a dynamic tidal inlet located in the Outer Banks of North Carolina, USA.

Results

Conclusion