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Observation and Modeling of the Morp...

Montoya, Liliana Velasquez.

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Observation and Modeling of the Morphodynamics of Tidal Inlets in the Northern Outer Banks of North Carolina.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Observation and Modeling of the Morphodynamics of Tidal Inlets in the Northern Outer Banks of North Carolina./
Author:	Montoya, Liliana Velasquez.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	140 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-02, Section: B.
Contained By:	Dissertations Abstracts International80-02B.
Subject:	Geomorphology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10969985
ISBN:	9780438284487

Observation and Modeling of the Morphodynamics of Tidal Inlets in the Northern Outer Banks of North Carolina.
Montoya, Liliana Velasquez.

Observation and Modeling of the Morphodynamics of Tidal Inlets in the Northern Outer Banks of North Carolina. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 140 p.

Source: Dissertations Abstracts International, Volume: 80-02, Section: B.

Thesis (Ph.D.)--North Carolina State University, 2018.

This item must not be sold to any third party vendors.

This dissertation presents a comprehensive overview of the morphodynamics of a semipermanent and an ephemeral tidal inlet located in northern Outer Banks of North Carolina: Oregon Inlet and Pea Island Breach. The temporal and spatial scales of the processes that drive the hydrodynamics and morphological evolution of these tidal inlets are studied by means of remotely sensed data, in-situ observations, and a high-resolution two-dimensional depth-averaged numerical model based on Delft3D. Geospatial metrics and analyses of observational data are used to study the historical behavior of both inlets, while the numerical model is used to identify their seasonal circulation, evolutional patterns, and possible interactions between inlets. Using multi-temporal aerial imagery and hydrographic surveys gathered from 2005 until 2015, decadal evolutional trends of Oregon Inlet are identified. Specifically, trends like a cyclical response of the inlet to dredging, the northward rotation of its main channel, and frequent sediment transport reversal in its southern shoulder. Similarly, aerial photography is used to study the 2-year lifecycle of Pea Island Breach, which opened in 2011 and closed in 2013. The evolution of the subaerial features of Pea Island Breach displays episodic curvature of its main channel, rotation of the ebb channel, shoaling, and widening by Hurricane Sandy (2012). A morphological model built for Oregon Inlet is calibrated, validated, and applied to study the hydrodynamics and medium-term (years) evolution of the inlet. Medium-term simulations lead to the definition of the spatial effects of tides and waves on the morphology of Oregon Inlet, sediment transport pathways, and sediment transport rate into the inlet. Concurrent with the model development, a sensitivity analysis to waves and tides is completed for Pea Island Breach. The results from simplified seasonal simulations lead to the definition of a qualitative model of the ephemeral inlet lifecycle and its closure mechanism. Additional modeling experiments combining Oregon Inlet and Pea Island Breach indicate that the latter did not have any hydrodynamic effects in the former. Exploration of idealized breaching scenarios in Pea Island suggests that inlet spacing and breaching geometry play a major role in multiple inlet stability theory.

ISBN: 9780438284487Subjects--Topical Terms:

542703
Geomorphology.

Observation and Modeling of the Morphodynamics of Tidal Inlets in the Northern Outer Banks of North Carolina.
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506 $a This item must not be added to any third party search indexes.
520 $a This dissertation presents a comprehensive overview of the morphodynamics of a semipermanent and an ephemeral tidal inlet located in northern Outer Banks of North Carolina: Oregon Inlet and Pea Island Breach. The temporal and spatial scales of the processes that drive the hydrodynamics and morphological evolution of these tidal inlets are studied by means of remotely sensed data, in-situ observations, and a high-resolution two-dimensional depth-averaged numerical model based on Delft3D. Geospatial metrics and analyses of observational data are used to study the historical behavior of both inlets, while the numerical model is used to identify their seasonal circulation, evolutional patterns, and possible interactions between inlets. Using multi-temporal aerial imagery and hydrographic surveys gathered from 2005 until 2015, decadal evolutional trends of Oregon Inlet are identified. Specifically, trends like a cyclical response of the inlet to dredging, the northward rotation of its main channel, and frequent sediment transport reversal in its southern shoulder. Similarly, aerial photography is used to study the 2-year lifecycle of Pea Island Breach, which opened in 2011 and closed in 2013. The evolution of the subaerial features of Pea Island Breach displays episodic curvature of its main channel, rotation of the ebb channel, shoaling, and widening by Hurricane Sandy (2012). A morphological model built for Oregon Inlet is calibrated, validated, and applied to study the hydrodynamics and medium-term (years) evolution of the inlet. Medium-term simulations lead to the definition of the spatial effects of tides and waves on the morphology of Oregon Inlet, sediment transport pathways, and sediment transport rate into the inlet. Concurrent with the model development, a sensitivity analysis to waves and tides is completed for Pea Island Breach. The results from simplified seasonal simulations lead to the definition of a qualitative model of the ephemeral inlet lifecycle and its closure mechanism. Additional modeling experiments combining Oregon Inlet and Pea Island Breach indicate that the latter did not have any hydrodynamic effects in the former. Exploration of idealized breaching scenarios in Pea Island suggests that inlet spacing and breaching geometry play a major role in multiple inlet stability theory.
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