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Controls on Sediment Exchange and Co...

Reeves, Ian Robert Blau.

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Controls on Sediment Exchange and Connectivity in Coastal Barrier Systems and Implications for Long-Term Evolution.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Controls on Sediment Exchange and Connectivity in Coastal Barrier Systems and Implications for Long-Term Evolution./
作者:	Reeves, Ian Robert Blau.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	142 p.
附註:	Source: Dissertations Abstracts International, Volume: 82-12, Section: B.
Contained By:	Dissertations Abstracts International82-12B.
標題:	Geomorphology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28419021
ISBN:	9798516058189

Controls on Sediment Exchange and Connectivity in Coastal Barrier Systems and Implications for Long-Term Evolution.
Reeves, Ian Robert Blau.

Controls on Sediment Exchange and Connectivity in Coastal Barrier Systems and Implications for Long-Term Evolution. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 142 p.

Source: Dissertations Abstracts International, Volume: 82-12, Section: B.

Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2021.

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

Sediment exchange within and among the barriers, marshes and bays of coastal barrier systems is critical to the subaerial maintenance of these landforms and their resilience to the impacts of storm events. However, these sediment pathways can be impacted by coastal ecology and internal barrier processes, the long-term effects of which remain understudied. In this dissertation, I explore three controls on sediment connectivity in coastal barrier systems - seagrass, dunes, and shrubs - and the implications of these controls for long-term (decadal to centurial) morphological evolution. In Chapter 1, I incorporate seagrass dynamics into an existing barrier-marsh exploratory model to examine the coupled interactions of the back-barrier bay with both adjacent (marsh) and nonadjacent (barrier) subsystems. Results suggest that the presence of seagrass in the bay generally reduces the loss of marsh but may actually enhance marsh erosion when sediment export from the back-barrier is negligible. Model simulations also suggest that expanding (contracting) seagrass meadows operate as dynamic sinks (sources) of sediment that lead to enhanced erosion (progradation) of the adjacent marsh. In Chapter 2, I develop the new model Barrier3D to explore the fundamental linkage between dune dynamics and barrier migration. My experiments demonstrate that discontinuous barrier retreat is a prevalent behavior that can arise directly from the bistability of foredune height, occurring most likely when the storm return period and characteristic time scale of dune growth are of similar magnitudes. Simulations suggest that discontinuous (continuous) retreat will become less (more) common in the future with greater sea-level rise rates and storm intensity. In Chapter 3, I add an ecological module of shrub expansion and mortality to Barrier3D to examine how shrubs alter barrier morphology and migration behaviors. Experimental results suggest that barriers with shrubs are significantly narrower and less voluminous than barriers without, are more likely to retreat discontinuously, and, under certain forcing conditions, may be more vulnerable to drowning. Taken together, these studies emphasize that ecological and internal barrier processes, while often neglected in exploratory barrier modeling, are essential components of long-term barrier evolution.

ISBN: 9798516058189Subjects--Topical Terms:

542703
Geomorphology.
Subjects--Index Terms:

Barrier

Controls on Sediment Exchange and Connectivity in Coastal Barrier Systems and Implications for Long-Term Evolution.
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500 $a Source: Dissertations Abstracts International, Volume: 82-12, Section: B.
500 $a Advisor: Moore, Laura J.
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506 $a This item must not be sold to any third party vendors.
520 $a Sediment exchange within and among the barriers, marshes and bays of coastal barrier systems is critical to the subaerial maintenance of these landforms and their resilience to the impacts of storm events. However, these sediment pathways can be impacted by coastal ecology and internal barrier processes, the long-term effects of which remain understudied. In this dissertation, I explore three controls on sediment connectivity in coastal barrier systems - seagrass, dunes, and shrubs - and the implications of these controls for long-term (decadal to centurial) morphological evolution. In Chapter 1, I incorporate seagrass dynamics into an existing barrier-marsh exploratory model to examine the coupled interactions of the back-barrier bay with both adjacent (marsh) and nonadjacent (barrier) subsystems. Results suggest that the presence of seagrass in the bay generally reduces the loss of marsh but may actually enhance marsh erosion when sediment export from the back-barrier is negligible. Model simulations also suggest that expanding (contracting) seagrass meadows operate as dynamic sinks (sources) of sediment that lead to enhanced erosion (progradation) of the adjacent marsh. In Chapter 2, I develop the new model Barrier3D to explore the fundamental linkage between dune dynamics and barrier migration. My experiments demonstrate that discontinuous barrier retreat is a prevalent behavior that can arise directly from the bistability of foredune height, occurring most likely when the storm return period and characteristic time scale of dune growth are of similar magnitudes. Simulations suggest that discontinuous (continuous) retreat will become less (more) common in the future with greater sea-level rise rates and storm intensity. In Chapter 3, I add an ecological module of shrub expansion and mortality to Barrier3D to examine how shrubs alter barrier morphology and migration behaviors. Experimental results suggest that barriers with shrubs are significantly narrower and less voluminous than barriers without, are more likely to retreat discontinuously, and, under certain forcing conditions, may be more vulnerable to drowning. Taken together, these studies emphasize that ecological and internal barrier processes, while often neglected in exploratory barrier modeling, are essential components of long-term barrier evolution.
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650 4 $a Marine geology. $3 3173821
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653 $a Coastal
653 $a Marsh
653 $a Overwash
653 $a Sea-level rise
690 $a 0484
690 $a 0556
690 $a 0594
710 2 $a The University of North Carolina at Chapel Hill. $b Geological Sciences. $3 1035690
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791 $a Ph.D.
792 $a 2021
793 $a English
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