Estimating Relative Sea-Level Rise and Submergence Potential at a Coastal Wetland

Cahoon, Donald R.

doi:10.1007/s12237-014-9872-8

Cited by 93 publications

(81 citation statements)

References 31 publications

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“…A design modification to the original SET (rod SET, Cahoon and others, 2002) allows rods to be driven to refusal, installed, and surveyed to standards similar to those for tide gages. Since both the SET and the tide gage measure vertical land motion simultaneously and relative to deep anchor depths (10-23 m), SETs and tide gages can be used in tandem to determine RSLR wet (Cahoon, 2015). The SET measurement integrates all of the processes controlling vertical soil movement within the upper >10-23 m and can be used as a nearly absolute measurement of VLM w in many settings.…”

Section: Performance Measure Discussion and Literaturementioning

confidence: 99%

“…The net change in surface elevation relative to sea-level rise is commonly referred to as relative sea-level rise (RSLR wet ); the subscript designates that RSLR is specific to the wetland surface in lieu of the survey depths of a tide gage (Cahoon, 2015):…”

Section: Pm3: Increasing Rates Of Soil Surface Elevation Gainmentioning

confidence: 99%

“…where RSLR is the relative sea-level rise trend from the nearest reliable long-term tide gage to the wetland of interest, and VLM w is vertical land motion of the wetland, or wetland soil surface elevation change (Cahoon, 2015).…”

Section: Pm3: Increasing Rates Of Soil Surface Elevation Gainmentioning

confidence: 99%

“…Local hydrologic conditions superimposed on sea-level rise can also contribute to surface elevation deficits and are sometimes modeled (Rybczyk and others, 1998) or considered empirically (Conner and Day, 1988). Determination of RSLR wet and the general surface elevation susceptibility to total submergence can be influenced by the technique used to assess deficits (Cahoon, 2015). For example, the amount of sediment deposited on the soil surface (vertical accretion) does not always correspond directly to VLM w (McKee and others, 2007), especially in an inactive delta (Nyman and others, 2006); however, vertical accretion is a large component of VLM w in many coastal wetlands (Cahoon and others, 1999;Lovelock and others, 2015 Coastal wetlands can actively build soil surface elevation by facilitating the deposition and retention of sediments during floods, stock-piling litter and woody debris, and promoting basal diameter and root volume expansion while limiting organic matter decomposition (Krauss and others, 2014).…”

Section: Pm3: Increasing Rates Of Soil Surface Elevation Gainmentioning

confidence: 99%

“…Cahoon (2015) defined another term, VLM c , that describes "the velocity of the substratum at the base of the [tide gage bench mark]"; for Maurepas Swamp, the proposed tide gage bench mark is the Grand Isle gage ( fig. 8).…”

Section: Repetitive Surveying Of Sets By Using High-precision D/ Rtk-mentioning

confidence: 99%

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Performance measures for a Mississippi River reintroduction into the forested wetlands of Maurepas Swamp

Krauss¹,

Shaffer²,

Keim³

et al. 2017

Scientific Investigations Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Krauss, K.W., Shaffer, G.P., Keim, R.F., Chambers, J.L., Wood, W.B., and Hartley, S.B., 2017, Performance measures for a Mississippi River reintroduction into the forested wetlands of Maurepas Swamp: U.S. Geological Survey Scientific Investigations Report 2017-5036, 56 p., https://doi.org/10.3133/sir20175036. ISSN 2328-0328 (online) iii AcknowledgmentsThe development of these performance measures was supported by the Coastal Protection and Restoration Authority (CPRA) of Louisiana. Specifically, we thank Carol Parsons Richards, Honora Buras, Brad Miller, and Richard Raynie, all with CPRA, for tasking this effort and providing much needed feedback along the way. Along with these partners, additional reviews of this document were provided by Danielle Richardi (CPRA), Christopher M. Swarzenski (U. S AbstractThe use of freshwater diversions (river reintroductions) from the Mississippi River as a restoration tool to rehabilitate Louisiana coastal wetlands has been promoted widely since the first such diversion at Caernarvon became operational in the early 1990s. To date, aside from the Bonnet Carré Spillway (which is designed and operated for flood control), there are only four operational Mississippi River freshwater diversions (two gated structures and two siphons) in coastal Louisiana, and they all target salinity intrusion, shellfish management, and (or) the enhancement of the integrity of marsh habitat. River reintroductions carry small sediment loads for various design reasons, but they can be effective in delivering freshwater to combat saltwater intrusion and increase the delivery of nutrients and suspended fine-grained sediments to receiving wetlands. River reintroductions may be an ideal restoration tool for targeting coastal swamp forest habitat; much of the area of swamp forest habitat in coastal Louisiana is undergoing saltwater intrusion, high rates of submergence, and lack of riverine flow leading to reduced concentrations of important nutrients and suspended sediments, which sustain growth and regeneration, help to aerate swamp soils, and remove toxic compounds from the rhizosphere.The State of Louisiana Coastal Protection and Restoration Authority (CPRA) has made it a priority to establish a small freshwater river diversion into a coastal swamp forest located between Baton Rouge and New Orleans, Louisiana, to reintrodu...

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Section: Performance Measure Discussion and Literaturementioning

confidence: 99%

Section: Pm3: Increasing Rates Of Soil Surface Elevation Gainmentioning

confidence: 99%

Section: Pm3: Increasing Rates Of Soil Surface Elevation Gainmentioning

confidence: 99%

Section: Pm3: Increasing Rates Of Soil Surface Elevation Gainmentioning

confidence: 99%

Section: Repetitive Surveying Of Sets By Using High-precision D/ Rtk-mentioning

confidence: 99%

See 3 more Smart Citations

Performance measures for a Mississippi River reintroduction into the forested wetlands of Maurepas Swamp

Krauss¹,

Shaffer²,

Keim³

et al. 2017

Scientific Investigations Report

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Regional Sea Level Variability and Trends, 1960–2007: A Comparison of Sea Level Reconstructions and Ocean Syntheses

Carson¹,

Köhl²,

Stammer³

et al. 2017

JGR Oceans

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Several existing statistical and dynamical reconstructions of past regional sea level variability and trends are compared with each other and with tide gauges over the 48 year period 1960–2007, partially predating the satellite altimetry era. Evaluated statistical reconstructions were built from tide‐gauge data (TGR), and dynamical reconstructions from ocean data assimilation (ODA) approaches. Although most of the TGRs yield global‐mean time series of sea level with trends deviating within only ±0.1 mm yr−1, the spatial anomalies of the trends deviate substantially between the reconstructions over the period predating altimetry. In contrast, TGRs match observed regional trend patterns fairly well during the satellite altimetry era. TGRs match tide‐gauge data better than ODA results; however, they exhibit less variability in the open ocean compared to altimetric data. Over the prealtimetry period, all reconstructed regional sea level trend patterns deviate substantially from each other. In terms of detrended correlations in this earlier period, the reconstructions match tide gauges, and each other, much better in the Pacific than in the Atlantic. An ensemble of all TGR and ODA estimates provides some improvements in correlations and trends to both tide gauges and altimetry. Nevertheless, a lack of independent open ocean sea surface height data predating altimetry makes impossible the validation of the ensemble for prealtimetry open ocean sea level trends and variability. Estimating regional sea level changes prior to altimetry therefore remains an unsolved challenge.

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Predicting landscape effects of Mississippi River diversions on soil organic carbon sequestration

et al. 2017

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Abstract. Large Mississippi River (MR) diversions (peak water flow >1416 m 3 /s and sediment loads >165 kg/s) have been proposed as part of a suite of coastal restoration projects and are expected to rehabilitate and rebuild wetlands to alleviate the significant historic wetland loss in coastal Louisiana. These coastal wetlands are undergoing increasing eustatic sea-level rise, land subsidence, climate change, and anthropogenic disturbances. However, the effect of MR diversions on wetland soil organic carbon (SOC) sequestration in receiving basins remains unknown. The rate of SOC sequestration or carbon burial in wetlands is one of the variables used to assess the role of wetland soils in carbon cycling and also to construct wetland carbon budgets. In this study, we examined the effects of MR water and sediment diversions on landscape-scale SOC sequestration rates that were estimated from vertical accretion for the next 50 yr (2010-2060) under two environmental (moderate and less optimistic) scenarios. Our analyses were based on model simulations taken from the Wetland Morphology model developed for Louisiana's 2012 Coastal Master Plan. The master plan modeled a "future-without-action" scenario as well as eight individual MR diversion projects in two of the hydrologic basins (Barataria and Breton Sound). We examined the effects that discharge rates (peak flow) and locations of these individual diversion projects had on SOC sequestration rates. Modeling results indicate that large river diversions are capable of improving basin-wide SOC sequestration capacity (162-222 g CÁm À2 Áyr À1 ) by up to 14% (30 g CÁm À2 Áyr À1 ) in Louisiana deltaic wetlands compared to the future-without-action scenario, especially under the less optimistic scenario. When large river diversions are placed in the upper receiving basin, SOC sequestration rates are 3.7-10.5% higher (6-24 g CÁm À2 Áyr À1 ) than when these structures are placed in the lower receiving basin. Modeling results also indicate that both diversion discharge and location have large effects on SOC sequestration in low-salinity (freshwater and intermediate marshes) as compared to high-salinity marshes (brackish and saline marshes).

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Estimating Relative Sea-Level Rise and Submergence Potential at a Coastal Wetland

Cited by 93 publications

References 31 publications

Performance measures for a Mississippi River reintroduction into the forested wetlands of Maurepas Swamp

Performance measures for a Mississippi River reintroduction into the forested wetlands of Maurepas Swamp

Regional Sea Level Variability and Trends, 1960–2007: A Comparison of Sea Level Reconstructions and Ocean Syntheses

Predicting landscape effects of Mississippi River diversions on soil organic carbon sequestration

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