Short-term vegetation succession and erosion identified by airborne remote sensing of Westerschelde salt marshes, The Netherlands

Thomson, A. G.; Huiskes, A.H.L.; Cox, R.; Wadsworth, Richard A.; Boorman, L.A.

doi:10.1080/01431160310001647688

Cited by 26 publications

(23 citation statements)

References 13 publications

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“…Many studies have used vegetation indices to aid in wetland vegetation mapping (Eastwood et al 1997;Thomson et al 2004;Zhang et al 1997). NDVI is considered an effective way to indicate presence of vegetation (Tuxen et al 2008), as it is usually highly correlated with green leaf biomass and green leaf area index and is often considered to be a proxy for primary production (Hardisky et al 1983(Hardisky et al , 1984Jensen 2000, Jensen et al 1998.…”

Section: Separation Of Vegetated and Non-vegetated Areasmentioning

confidence: 99%

Mapping changes in tidal wetland vegetation composition and pattern across a salinity gradient using high spatial resolution imagery

Tuxen

Schile

Stralberg

et al. 2010

Wetlands Ecol Manage

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Detailed vegetation mapping of wetlands, both natural and restored, can offer valuable information about vegetation diversity and community structure and provides the means for examining vegetation change over time. We mapped vegetation at six tidal marshes (two natural, four restored) in the San Francisco Estuary, CA, USA, between 2003 and 2004 using detailed vegetation field surveys and high spatial-resolution color-infrared aerial photography. Vegetation classes were determined by performing hierarchical agglomerative clustering on the field data collected from each tidal marsh. Supervised classification of the CIR photography resulted in vegetation class mapping accuracies ranging from 70 to 92%; 10 out of 12 classification accuracies were above 80%, demonstrating the potential to map emergent wetland vegetation. The number of vegetation classes decreased with salinity, and increased with size and age. In general, landscape diversity, as measured by the Shannon's diversity index, also decreased with salinity, with an exception for the most saline site, a newly restored marsh. Vegetation change between years is evident, but the differences across sites in composition and pattern were larger than change within sites over two growing seasons.

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Section: Separation Of Vegetated and Non-vegetated Areasmentioning

confidence: 99%

Mapping changes in tidal wetland vegetation composition and pattern across a salinity gradient using high spatial resolution imagery

Tuxen

Schile

Stralberg

et al. 2010

Wetlands Ecol Manage

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“…Nottage and a b c Fig. 2 a Location of The Wash, eastern England and Freiston Shore (after Thomson et al 2004 Robertson (2005) have described the preparatory work carried out before breach realignment to maintain defence capability and to encourage sedimentation and vegetation colonization in the area returned to tidal exchange. These works included the strengthening of seawall to the rear of the site, levelling of the site elevation, the creation of drainage channels within the site, and the excavation of three breaches in the existing flood defence.…”

Section: Study Area: Freiston Shorementioning

confidence: 98%

Surface elevation change in natural and re-created intertidal habitats, eastern England, UK, with particular reference to Freiston Shore

Spencer

Friess

Möller

et al. 2011

Wetlands Ecol Manage

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Quantification of processes contributing to overall surface elevation change is critical to the accurate assessment of saltmarsh sedimentary status, particularly when predicting system stability in relation to accelerated sea level rise. Rates of short-term (up to 5.5 years) surface elevation change and accretion on a temperate saltmarsh were measured at an open coast managed realignment (habitat creation) trial, and the surrounding intertidal zone using surface elevation table-marker horizon (accretion plate) methodologies. Mean surface elevation changes on vegetated saltmarsh control sites, at some distance from the hydrodynamic disturbance of breaches in a former sea defence line, showed rates of change compatible with marsh surface dynamics seen elsewhere in the region, exceeding rates of regional relative sea-level rise. Within the managed realignment, sites close to the breaches showed exceptionally high rates of both accretion and surface elevation change, most likely as a result of high localized sediment supply from breach and channel enlargement and the presence of surfaces left unnaturally low in the tidal frame. Positive surface elevation change on the landward side of the breaches reached [30.4 mm a -1 , up to one hundred times greater than rates of surface elevation change at locations 1 km from the breach entrances. Shallow sub-surface processes, or 'surface subsidence', was an important process on natural marshes outside the managed realignment but not seen within the site, due to the consolidated nature of the underlying substrate. The Freiston Shore managed realignment site shows remarkably similar time variation in mean elevation to that of the longer record from the Tollesbury managed realignment site, Blackwater estuary, Essex coast, UK. It is not clear how long it will take for re-created intertidal habitats at both Freiston Shore and Tollesbury to approach an 'equilibrium' elevation within the tidal frame but modelling suggests that in natural wetlands on the coast of eastern England this process takes at least 150 years.

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“…This was an issue if the remotely sensed data collected coincided with a time when the areas of the salt marshes were affected by different levels of inundation. The solution to this problem, suggested in the literature [21,26], was to use airborne remote sensing systems where the time of data collection could be related to tidal conditions. Airborne systems were also seen as appropriate for inter-tidal zones because of their generally higher spatial and spectral resolutions [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

“…The solution to this problem, suggested in the literature [21,26], was to use airborne remote sensing systems where the time of data collection could be related to tidal conditions. Airborne systems were also seen as appropriate for inter-tidal zones because of their generally higher spatial and spectral resolutions [26][27][28]. Even with the advent of satellite sensors such as Quickbird TM and Ikonos TM , which had spatial resolutions similar to airborne systems, there was still the lack of flexibility in relating satellite overpass time to tidal conditions.…”

Section: Introductionmentioning

confidence: 99%

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Spectral characteristics of plant communities from salt marshes: A case study from Chongming Dongtan, Yangtze estuary, China

Zhang

Gao

Armitage

et al. 2008

Front. Environ. Sci. Eng. China

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The spectral reflectance of recently formed salt marshes at the mouth of the Yangtze River, which are undergoing invasion by Spartina alterniflora, were assessed to determine the potential utility of remotely sensed data in assessing future invasion and changes in species composition. Following a review of published research on remote sensing of salt marshes, 53 locations along three transects were sampled for paired data on plant species composition and spectral reflectance using a FieldSpec TM Pro JR Field Portable Spectroradiometer. Spectral data were processed concerning reflectance, and the averaged reflectance values for each sample were reanalysed to correspond to a 12-waveband bandset of the Compact Airborne Spectral Imager. The spectral data were summarised using principal components analysis (PCA) and the relationships between the vegetation composition, and the PCA axes of spectral data were examined. The first PCA axis of the reflectance data showed a strong correlation with variability in near infrared reflectance and 'brightness', while the second axis was correlated with visible reflectance and 'greenness'. Total vegetation cover, vegetation height, and mudflat cover were all significantly related to the first axis. The implications of this in terms of the ability of remote sensing to distinguish the various salt marsh species and in particular the invasive species S. alterniflora were discussed. Major differences in species with various physiognomies could be recognised but problems occurred in separating early colonising S. alterniflora from other species at that stage. Further work using multi-seasonal hyperspectral data might assist in solving these problems.

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Short-term vegetation succession and erosion identified by airborne remote sensing of Westerschelde salt marshes, The Netherlands

Cited by 26 publications

References 13 publications

Mapping changes in tidal wetland vegetation composition and pattern across a salinity gradient using high spatial resolution imagery

Mapping changes in tidal wetland vegetation composition and pattern across a salinity gradient using high spatial resolution imagery

Surface elevation change in natural and re-created intertidal habitats, eastern England, UK, with particular reference to Freiston Shore

Spectral characteristics of plant communities from salt marshes: A case study from Chongming Dongtan, Yangtze estuary, China

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