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Accretion, Compaction, and Restorati...

Keogh, Margaret E. H.

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Accretion, Compaction, and Restoration: Sediment Dynamics and Relative Sea-level Rise in Coastal Wetlands.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Accretion, Compaction, and Restoration: Sediment Dynamics and Relative Sea-level Rise in Coastal Wetlands./
Author:	Keogh, Margaret E. H.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	172 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-03, Section: B.
Contained By:	Dissertations Abstracts International81-03B.
Subject:	Sedimentary geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13880656
ISBN:	9781085636537

Accretion, Compaction, and Restoration: Sediment Dynamics and Relative Sea-level Rise in Coastal Wetlands.
Keogh, Margaret E. H.

Accretion, Compaction, and Restoration: Sediment Dynamics and Relative Sea-level Rise in Coastal Wetlands. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 172 p.

Source: Dissertations Abstracts International, Volume: 81-03, Section: B.

Thesis (Ph.D.)--Tulane University School of Science and Engineering, 2019.

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

Over the past two centuries, coastal wetlands have become increasingly threatened by accelerated relative sea-level rise and anthropogenic modification. Engineered structures such as sea walls, levees, and drainage systems prevent natural processes of sediment distribution, reducing the resilience of coastal ecosystems. Land subsidence and shoreline erosion combine with global sea-level rise to make low-elevation coastal zones increasingly vulnerable to submergence. This dissertation examines processes of sediment accumulation, compaction, and relative sea-level rise in coastal wetlands and assesses strategies for restoration. I find that organic content strongly controls sediment compaction in wetland sediments. At least 80% of compaction happens quickly, largely within the first 100 years after deposition and in the top 1 m of the subsurface. This rapid shallow compaction is generally not recorded by traditional methods of measuring relative sea-level rise in low-elevation coastal zones (i.e., tide gauges and global navigation satellite systems). As a result, tide gauges generally underestimate rates of relative sea-level rise in low-elevation coastal zones and these areas may be at a greater risk of flooding than previously realized. However, despite accelerated rates of relative sea-level rise and rapid sediment compaction, coastal restoration efforts such as river diversions can be successful in building new land in some areas. I find that sediment deposition responds non-linearly to water discharge, reaching a maximum at moderate discharge. Wetlands are more likely to keep up with relative sea-level rise if hydrodynamic conditions are optimized to retain mineral sediment in targeted restoration areas.

ISBN: 9781085636537Subjects--Topical Terms:

3173828
Sedimentary geology.
Subjects--Index Terms:

Coastal restoration

Accretion, Compaction, and Restoration: Sediment Dynamics and Relative Sea-level Rise in Coastal Wetlands.
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100 1 $a Keogh, Margaret E. H. $3 3546131
245 1 0 $a Accretion, Compaction, and Restoration: Sediment Dynamics and Relative Sea-level Rise in Coastal Wetlands.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 172 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-03, Section: B.
500 $a Advisor: Kolker, Alexander S.;Tornqvist, Torbjorn E.
502 $a Thesis (Ph.D.)--Tulane University School of Science and Engineering, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a Over the past two centuries, coastal wetlands have become increasingly threatened by accelerated relative sea-level rise and anthropogenic modification. Engineered structures such as sea walls, levees, and drainage systems prevent natural processes of sediment distribution, reducing the resilience of coastal ecosystems. Land subsidence and shoreline erosion combine with global sea-level rise to make low-elevation coastal zones increasingly vulnerable to submergence. This dissertation examines processes of sediment accumulation, compaction, and relative sea-level rise in coastal wetlands and assesses strategies for restoration. I find that organic content strongly controls sediment compaction in wetland sediments. At least 80% of compaction happens quickly, largely within the first 100 years after deposition and in the top 1 m of the subsurface. This rapid shallow compaction is generally not recorded by traditional methods of measuring relative sea-level rise in low-elevation coastal zones (i.e., tide gauges and global navigation satellite systems). As a result, tide gauges generally underestimate rates of relative sea-level rise in low-elevation coastal zones and these areas may be at a greater risk of flooding than previously realized. However, despite accelerated rates of relative sea-level rise and rapid sediment compaction, coastal restoration efforts such as river diversions can be successful in building new land in some areas. I find that sediment deposition responds non-linearly to water discharge, reaching a maximum at moderate discharge. Wetlands are more likely to keep up with relative sea-level rise if hydrodynamic conditions are optimized to retain mineral sediment in targeted restoration areas.
590 $a School code: 0494.
650 4 $a Sedimentary geology. $3 3173828
650 4 $a Geomorphology. $3 542703
650 4 $a Hydrologic sciences. $3 3168407
653 $a Coastal restoration
653 $a Coastal wetlands
653 $a Mississippi Delta
653 $a River diversion
653 $a Sea-level rise
653 $a Sediment compaction
690 $a 0594
690 $a 0484
690 $a 0388
710 2 $a Tulane University School of Science and Engineering. $b Earth and Environmental Sciences. $3 2106116
773 0 $t Dissertations Abstracts International $g 81-03B.
790 $a 0494
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13880656