Assessing significant geomorphic changes and effectiveness of dynamic restoration in a coastal dune ecosystem

Walker, Ian J.; Eamer, Jordan B.R.; Darke, Ian B.

doi:10.1016/j.geomorph.2013.04.023

Cited by 53 publications

(50 citation statements)

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“…Related research has explored novel techniques for DEM generation and change detection (see Walker et al, 2013). Essentially, each interval DEM from the swaths was compared against the initial (pre-restoration) LiDAR DEM.…”

Section: Geomorphic and Volumetric Change Detectionmentioning

confidence: 99%

“…Martinez and Psuty, 2004;Martinez et al, 2013;Walker et al, 2013). Martinez and Psuty, 2004;Martinez et al, 2013;Walker et al, 2013).…”

Section: Assessing Restoration Effectivenessmentioning

confidence: 99%

“…Martinez and Psuty, 2004;Martinez et al, 2013;Walker et al, 2013). This project explored the application of such metrics in the form of several geo-indicators that can be used to assess the effectiveness of dynamic dune restoration efforts according to Walker et al (2013), including: (1) increased aeolian activity (sand transport, erosion, deposition); (2) enlarged active sand surface areas; (3) a positive sediment budget; (4) increased dune mobility and morphodynamics; (5) improved geomorphic diversity; (6) enhanced geomorphic resilience as indicated by a return to the more dynamic pre-disturbance state, in this case pre-Ammophila invasion. This project explored the application of such metrics in the form of several geo-indicators that can be used to assess the effectiveness of dynamic dune restoration efforts according to Walker et al (2013), including: (1) increased aeolian activity (sand transport, erosion, deposition); (2) enlarged active sand surface areas; (3) a positive sediment budget; (4) increased dune mobility and morphodynamics; (5) improved geomorphic diversity; (6) enhanced geomorphic resilience as indicated by a return to the more dynamic pre-disturbance state, in this case pre-Ammophila invasion.…”

Section: Assessing Restoration Effectivenessmentioning

confidence: 99%

“…Results presented here are interpreted as a means to explore restoration responses at the often overlooked meso-scale, and to provide preliminary data from which to explore a more complete morphodynamic assessment of the Wickaninnish beach-dune system. The criteria for assessing restoration effectiveness was presented in Walker et al (2013), which defined six key indicators of geomorphic effectiveness including: (1) increased aeolian activity (sand transport, erosion, deposition); in an effort to restore dynamic habitat for native and endangered species within a coastal foredune and transgressive dune system on the west coast of Vancouver Island, British Columbia, Canada.…”

Section: Introductionmentioning

confidence: 99%

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Beach–dune sediment budgets and dune morphodynamics following coastal dune restoration, Wickaninnish Dunes, Canada

Darke

Walker

Hesp

2016

Earth Surf Processes Landf

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The results from three years of surveying and monitoring a dynamic foredune and dunefield restoration effort on Vancouver Island, Canada is presented. Complete removal of foredune vegetation occurred in three phases spaced a year apart in an effort to control invasive Ammophila spp. The collection of airborne LiDAR, orthophotographs, and bi‐monthly topographic surveys provided a means to quantify and examine sediment budgets and geomorphic responses. Three survey swaths, corresponding with each phase of vegetation removal, were established to provide detailed topographic coverage over the impacted beach, foredune, and dunefield landscape units. The swath corresponding with the first phase of removal recorded a positive sediment budget of 1·3 m3 m−2 after three years. A control swath, with data collected for a year prior and two years following removal, exhibited a distinct pulse of sediment delivery into the dunefield unit with a maximum gain of 0·03 m3 m−2 pre‐removal compared to 0·11 m3 m−2 post‐removal. Vegetation analysis zones, associated with each of the three swaths, demonstrate a range of vegetation responses due to variation in the vegetation removal and subsequent re‐invasion or removal methods employed. The first site to be cleared of vegetation, received ongoing invasive re‐growth control, and three years following removal vegetation cover dropped from 57% in 2009 to 13% in 2012 (−44%). An adjacent site was cleared of vegetation two years later (only one year of recovery) but experienced rapid Ammophila re‐invasion and percent cover changed from 61% in 2009 to 26% in 2012 (−35%). The data presented provides insights for improving the application of sediment budget monitoring in dynamic restorations and discusses the potential for detailed spatial–temporal survey data to improve our understanding of meso‐scale landscape morphodynamics following foredune disturbance. Overall, the vegetation removal treatments reduced the extent of invasive grass and increased dunefield mobility and dynamic activity. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Geomorphic and Volumetric Change Detectionmentioning

confidence: 99%

“…Martinez and Psuty, 2004;Martinez et al, 2013;Walker et al, 2013). Martinez and Psuty, 2004;Martinez et al, 2013;Walker et al, 2013).…”

Section: Assessing Restoration Effectivenessmentioning

confidence: 99%

Section: Assessing Restoration Effectivenessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Beach–dune sediment budgets and dune morphodynamics following coastal dune restoration, Wickaninnish Dunes, Canada

Darke

Walker

Hesp

2016

Earth Surf Processes Landf

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“…Among other factors, sea level rise and more frequent intense storms are projected to have important effects on the geomorphological and ecological processes regulating barrier island dynamics [e.g., Moore et al ., ; Zinnert et al ., ; Duran Vinent and Moore , ]. In particular, vegetation plays a central role in engineering dune topography by trapping and stabilizing the sand, and thus exerts a first‐order control on barrier island dynamics [e.g., Short and Hesp , ; Hesp , ; Hesp , ; Psuty , ; Duran and Moore , ; Walker et al ., ]. Burial‐tolerant species, such as Ammophila breviligulata , are known to increase sediment accumulation in dune areas [ Godfrey , ; Disraeli , ], whereas species less tolerant to burial, such as Spartina patens , are considered to be important in stabilizing low‐elevation areas and in promoting dune recovery after overwash events [ Godfrey , ; Ritchie and Penland , ; Wolner et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Coupled topographic and vegetation patterns in coastal dunes: Remote sensing observations and ecomorphodynamic implications

et al. 2017

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Vegetation plays a key role in stabilizing coastal dunes and barrier islands by mediating sand transport, deposition, and erosion. Dune topography, in turn, affects vegetation growth, by determining local environmental conditions. However, our understanding of vegetation and dune topography as coupled and spatially extensive dynamical systems is limited. Here we develop and use remote sensing analyses to quantitatively characterize coastal dune ecotopographic patterns by simultaneously identifying the spatial distribution of topographic elevation and vegetation biomass. Lidar‐derived leaf area index and hyperspectral‐derived normalized difference vegetation index patterns yield vegetation distributions at the whole‐system scale which are in agreement with each other and with field observations. Lidar‐derived concurrent quantifications of biomass and topography show that plants more favorably develop on the landward side of the foredune crest and that the foredune crestline marks the position of an ecotone, which is interpreted as the result of a sheltering effect sharply changing local environmental conditions. We conclude that the position of the foredune crestline is a chief ecomorphodynamic feature resulting from the two‐way interaction between vegetation and topography.

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Aeolian sand transport thresholds in excavated foredune notches

Nguyen

Hilton

Wakes

2021

Earth Surf Processes Landf

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Excavation of 'notches' in foredunes aims to facilitate sand transport through the foredune zone to enhance biodiversity and increase foredune resilience. Recent research has examined notch morphodynamics, however, the underlying aeolian processes in relation to sand transport have not been examined. This study determines:(i) the critical incident wind conditions resulting in sand transport inside the notch; and (ii) the pattern of wind flow and sand deposition/erosion inside the notch.Secondary winds are recorded using 12 ultrasonic anemometers deployed at crossnotch stations and compared with incident winds measured on a mast 6.5 m above foredune crest. Instantaneous sand transport is recorded using 12 laser particle counters located on four masts across the notch. Sand deposition is measured using erosion pins and digital surface models derived from remotely piloted aerial system.Field data are used to validate Computational Fluid Dynamic wind flow simulations to provide three-dimensional wind direction and speed contours in the notch. The study area is

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Assessing significant geomorphic changes and effectiveness of dynamic restoration in a coastal dune ecosystem

Cited by 53 publications

References 65 publications

Beach–dune sediment budgets and dune morphodynamics following coastal dune restoration, Wickaninnish Dunes, Canada

Beach–dune sediment budgets and dune morphodynamics following coastal dune restoration, Wickaninnish Dunes, Canada

Coupled topographic and vegetation patterns in coastal dunes: Remote sensing observations and ecomorphodynamic implications

Aeolian sand transport thresholds in excavated foredune notches

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