A 17-yr record of sediment accretion in the salt marshes of Maine (USA)

Goodman, Jody E.; Wood, Mark E.; Gehrels, W. Roland

doi:10.1016/j.margeo.2006.09.017

Cited by 41 publications

(19 citation statements)

References 45 publications

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“…Although subsurface sediment compaction could not be estimated in the study area, it seems unlikely to be a significant process contributing to changes in marsh elevation, at least over the time scale here investigated (Goodman et al, 2007). Although SLR apparently slows down the accretion rates in the Tagus salt marshes, there is still a positive balance with sea-level rise.…”

Section: Discussionmentioning

confidence: 79%

“…In contrast, in macrotidal marshes there is not such an evident relationship (Goodman et al, 2007). The fact that most marshes do show a significant build-up of vertical accretion, that exceeds the MSL, is in part attributed to the spatial variation in SAR being influenced by the topography of the estuary itself and consequently influencing the frequency and duration of tidal flooding at each marsh (French, 2006).…”

Section: Discussionmentioning

confidence: 98%

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Tagus estuary salt marshes feedback to sea level rise over a 40-year period: Insights from the application of geochemical indices

Duarte

Caçador

Marques

et al. 2013

Ecological Indicators

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a b s t r a c tSea level rise (SLR) has been evaluated using data acquired from two Tagus estuary salt marshes. Sediment accumulation rates over a 40-year study period were determined using 137 Cs along with an evaluation of several geochemical indices and ratios as proxies of the mechisms underlying these SAR variations. Correlating SLR data from 1963 to 2001 with the sediment accretion rates (SARs) an inverse pattern of interaction was observed, with lower SAR associated to periods of higher mean sea level (MSL) heights. This pointed out to an erosion effect of the salt marsh during higher tidal flooding. Although SLR apparently slows down SAR, it still presents a positive balance with SLR, similar to that identified in most mesotidal estuaries. The geochemical analysis of sediments and chemical alteration index (CAI) also suggest that the major processes inherent to the SAR vary inversely, being mostly based by physical disturbances. Geochemical ratio-based indices showed that both salt marshes presented enhanced highenergy transport driven inputs of sediments, although in Pancas salt marsh there is a slight evidence of chemical weathering of the sediments. Anthropogenic contamination of the sediments by heavy metals was identified and has been decreasing from 1963 to 2001, mostly linked to a marked reduction of industrial activities in some areas surrounding the Tagus estuary, rather than the sedimentary history of the estuary.

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Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 98%

Tagus estuary salt marshes feedback to sea level rise over a 40-year period: Insights from the application of geochemical indices

Duarte

Caçador

Marques

et al. 2013

Ecological Indicators

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“…Desde un punto de vista morfodinámico evolutivo, existe una relación directa entre desarrollo y crecimiento de marismas y oscilaciones del nivel del mar (Goodman et al, 2007;Rahman y Plater, 2014). En las marismas de nuestras latitudes, la tendencia general al ascenso eustático tras la última glaciación, unida a la compactación del sedimento arcilloso típico de los ambientes de marisma, han provocado un aumento de la profundidad de acomodación sedimentaria, favoreciendo la acreción vertical (Allen, 2000;Brain et al, 2015).…”

Section: Evolución Histórica De Las Marismas Y Salinas De La Bahía Deunclassified

Evolución histórica y geomorfología de las explotaciones salineras en marismas mareales. Ejemplos de la bahía de Cádiz

Prieto

Villalobos

Abarca

2017

CyG

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Las marismas son espacios explotados por el ser humano a lo largo de siglos debido a la importancia de sus recursos y a la posibilidad de obtenerlos con cierta facilidad. Diferentes AbstractThis work displays a synthesis about the current knowledge about the origin and historical development of the salines on the Bay of Cádiz. Geoarchaeological data suggest that the first salines were probably built in the area during the Phoenician period, although their development seems to have been greater in the Roman epoch, favored by a sedimentation rate increase in the marshes of the zone. Nowadays very few records exist of the ancient salt works and salt harvesting, due to the continuous reutilisation of these structures over centuries. The present location of salines in the Bay of Cádiz is in part controlled by the distribution of the sedimentation rates registered in the salt marshes, which are conditioned by the geometry of the tidal channels. After the last phase of saline expansion during the 19 th century, the Bay of Cádiz salinas have suffered a progressive abandonment and degradation, due both to human actions (infilling for agricultural, transportation, industrial and urban uses) and to natural processes (aeolian sand sedimentation, erosion due to the acceleration of tidal fluxes, etc.). Nevertheless, despite their deterioration, today their preservation as anthropogenic landscapes of heritage interest for public could be insured due to their membership of the Bay of Cádiz Natural Park, and to be placed within the public maritime-terrestrial domain (Spanish Shore Act).

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“…Tidal salt marshes are complex dynamic systems that can maintain their surface elevation relative to local sea levels given enough time and accretion potential (Goodman et al 2007;Reed 2002;Temmerman et al 2004). The biogeomorphic interplay of vegetation structure and hydric soil sedimentation processes are important in marsh development across geographic space and time (Reed 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Species composition, structure, and density of vegetation will influence sediment deposition and rooting pore spaces (Nyman et al 1990(Nyman et al , 2006. OM accumulation and biomass has been shown to be important components in maintaining marsh elevation (Goodman et al 2007;Reed 2002;Culberson et al 2004;Callaway et al 1997). Marsh vegetation can stabilize the substrate and trap sediment (preventing erosion) which can increase marsh surface elevation.…”

Section: Introductionmentioning

confidence: 99%

Importance of Biogeomorphic and Spatial Properties in Assessing a Tidal Salt Marsh Vulnerability to Sea-level Rise

Thorne

Elliott‐Fisk

Wylie

et al. 2013

Estuaries and Coasts

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We evaluated the biogeomorphic processes of a large (309 ha) tidal salt marsh and examined factors that influence its ability to keep pace with relative sea-level rise (SLR). Detailed elevation data from 1995 and 2008 were compared with digital elevation models (DEMs) to assess marsh surface elevation change during this time. Overall, 37 % (113 ha) of the marsh increased in elevation at a rate that exceeded SLR, whereas 63 % (196 ha) of the area did not keep pace with SLR. Of the total area, 55 % (169 ha) subsided during the study period, but subsidence varied spatially across the marsh surface. To determine which biogeomorphic and spatial factors contributed to measured elevation change, we collected soil cores and determined percent and origin of organic matter (OM), particle size, bulk density (BD), and distance to nearest bay edge, levee, and channel. We then used Akaike Information Criterion (AICc) model selection to assess those variables most important to determine measured elevation change. Soil stable isotope compositions were evaluated to assess the source of the OM. The samples had limited percent OM by weight (<5.5 %), with mean bulk densities of 0.58 g cm -3 , indicating that the soils had high mineral content with a relatively low proportion of pore space. The most parsimonious model with the highest AICc weight (0.53) included distance from bay's edge (i.e., lower intertidal) and distance from levee (i.e., upper intertidal). Close proximity to sediment source was the greatest factor in determining whether an area increased in elevation, whereas areas near landward levees experienced subsidence. Our study indicated that the ability of a marsh to keep pace with SLR varied across the surface, and assessing changes in elevation over time provides an alternative method to long-term accretion monitoring. SLR models that do not consider spatial variability of biogeomorphic and accretion processes may not correctly forecast marsh drowning rates, which may be especially true in modified and urbanized estuaries. In light of SLR, improving our understanding of elevation change in these dynamic marsh systems will play a crucial role in forecasting potential impacts to their sustainability and the survival of these ecosystems.

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A 17-yr record of sediment accretion in the salt marshes of Maine (USA)

Cited by 41 publications

References 45 publications

Tagus estuary salt marshes feedback to sea level rise over a 40-year period: Insights from the application of geochemical indices

Tagus estuary salt marshes feedback to sea level rise over a 40-year period: Insights from the application of geochemical indices

Evolución histórica y geomorfología de las explotaciones salineras en marismas mareales. Ejemplos de la bahía de Cádiz

Importance of Biogeomorphic and Spatial Properties in Assessing a Tidal Salt Marsh Vulnerability to Sea-level Rise

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