Evolution of foredune texture following dynamic restoration, Doughboy Bay, Stewart Island, New Zealand

Konlechner, Teresa M.; Ryu, Wansang; Hilton, Michael J.; Sherman, Douglas J.

doi:10.1016/j.aeolia.2015.06.003

Cited by 18 publications

(21 citation statements)

References 41 publications

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“…mechanical removal, grazing, herbicide-based devegetation, hand pulling) to 'rejuvenate' the variability and biodiversity of dune habitats (Figure 5) (Darke et al, 2016;Konlechner et al, 2014;Pye et al, 2014). Such destabilisation measures have been conducted in different dune systems, including Kennemerland dune in the Netherlands (Arens et al, 2004(Arens et al, , 2013, Nizzanim dunes in Israel (Bar, 2013), Steward Island in New Zealand (Hilton and Konlechner, 2010;Konlechner et al, 2014Konlechner et al, , 2015, Lanphere and Ma-le'l dunes in the northern California (Pickart, 2013) and Wickaninnish dunes in Canada (Darke et al, 2013(Darke et al, , 2016. Increased dune variety and dune reactivation were observed in these dune sites after the projects.…”

Section: Changes In Climatementioning

confidence: 99%

“…Over the past century, human activities have played an increasingly important role in altering dune mobility (Nordstrom, 1994). For example, afforestation programmes have accelerated in dune stabilisation in several countries (Avis, 1989;Reckendorf et al, 1985), while overgrazing and trampling have destroyed vegetated surfaces, resulting in dune mobilisation (Arens et al, 2007;Delgado-Fernandez et al, 2019a;Hesp et al, 2010;Konlechner et al, 2014Konlechner et al, , 2015. Urbanisation and coastal management have also altered dune mobility through landuse change (Hernández-Cordero et al, 2018;Malavasi et al, 2013;Marcomini et al, 2017;Sytnik and Stecchi, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Coastal dune mobility over the past century: A global review

Gao

Kennedy

Konlechner

2020

Progress in Physical Geography: Earth and Environment

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The mobility of coastal dunes is characterised by bio-geomorphological responses related to change in boundary conditions, particularly sediment supply, wind and vegetation cover, as well as human activities. There remains uncertainty regarding the relative importance of these drivers on dune mobility at a global scale. In this study, trends and dominant drivers of coastal dune mobility are synthesised through the literature review focusing on shifts in dune mobility over the last century (1870–2018). In total, 176 individual dunes, with 55 dunes from the Europe-Mediterranean area, 23 from Africa, 30 from North America, 23 from South America, 20 from Oceania and 23 from Asia, are reviewed in this work. The results show that there is a worldwide trend of dune stabilisation, with 93% (164 out of 176) of the reviewed sites showing a loss of bare sand area due to an increase in vegetation cover and urbanisation expansion. Multiple factors have contributed to the stabilisation process, including (a) land-use change such as the change of traditional farming practises, coastal urbanisation and tourism development; (b) dune stabilisation projects; (c) sediment decline caused by the riverine and coastal constructions; and (d) change in climate (i.e. the decrease in windiness, and the increase in temperature and rainfall) and storms. Our results suggest human intervention played a dominant role in altering dune mobility for most dunes during the past century, while climate and storms are also important drivers, especially for dune sites with limited human activities.

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Section: Changes In Climatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coastal dune mobility over the past century: A global review

Gao

Kennedy

Konlechner

2020

Progress in Physical Geography: Earth and Environment

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“…Since the early 1970s, there has been a rapid decline in active sand surface area (À28% from 1973, Heathfield and Walker, 2011. New Zealand, see Hilton et al, 2005;Hesp and Hilton, 2013;Konlechner et al, 2015) provide analogous case studies to aid in understanding the pre-invasion landscape. (primarily A. arenaria) colonization of the foredune has reduced sand supply to such a degree that aeolian processes are only operating locally within the landward transgressive dunefield, resulting in accelerated vegetation stabilization.…”

Section: Regional Settingmentioning

confidence: 99%

“…Cooper, 1958;Buell et al, 1995;Wiedemann and Pickart, 1996;Wiedemann, 1998;Pickart, 2013) and in other temperate dune systems in the world (e.g. New Zealand, see Hilton et al, 2005;Hesp and Hilton, 2013;Konlechner et al, 2015) provide analogous case studies to aid in understanding the pre-invasion landscape.…”

Section: Regional Settingmentioning

confidence: 99%

“…A group of recent studies in the Netherlands (e.g. Arens et al, 2013aArens et al, , 2013bGrootjans et al, 2013) and more recently in New Zealand (Hesp and Hilton, 2013;Konlechner et al, 2014Konlechner et al, , 2015 and the United States (Pickart, 2013;Seabloom et al, 2013) have examined changes to vegetation coverage and large-scale erosion/deposition patterns as well as vulnerabilities to wave overtopping. However, few studies have quantified or monitored sediment budget responses and related morphodynamics within coastal beach-dune systems following restoration actions.…”

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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Changes in the vegetation cover of transgressive dune fields: A case study in Cape Woolamai, Victoria

Gao

Kennedy

Konlechner

et al. 2021

Earth Surf Processes Landf

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Changes in vegetation cover and dune mobility of Woolamai dune fields on the southeast coast of Australia were quantified based on a time series of aerial imagery (1939 to 2020). Results showed that the dune fields have shifted from nearly all bare sand (with <5% vegetation cover) to a new quasi‐equilibrium state, being almost fully stabilized by vegetation (>80%) from 1939 to 2020. Three temporal stages of vegetation change were identified, namely: (I) early expansion over 1939–1975; (II) rapid growth from 1976 to 2010; and (III) recent ‘quasi‐equilibrium’ state in 2010–2020. In stage I, complex impacts of climate and human activities co‐existed with uncertainty of the dominant factor. In this early stage, vegetation growth was constrained to the low and sheltered areas, indicating the influence of topography. Rapid vegetation growth took place in 1976–2010 (stage II), during which a re‐vegetation programme combined with favourable climate conditions promoted vegetation growth. In the last decade (stage III), vegetation might have reached a new quasi‐equilibrium when the vegetation almost reached a maximum. The slight loss of vegetation could be attributed to weed control and an unfavourable climate for growth (drier and windier) in Woolamai dune fields. This study showed that variations in vegetation cover and dune mobility through time are not simply linked to a single factor but depend on the occurrence of multiple factors (e.g. topography, climate and human activities) that promote stability, or alternatively, mobility of the dune system. This research contributes to expanding our understanding of the complexity of the bio‐geomorphologic dynamics in dune fields. It also provides detailed observational evidence for the historical trajectory of vegetation expansion from the bare dune fields to a fully stabilized state, which can be used to verify and refine models for other similar dune sites.

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Evolution of foredune texture following dynamic restoration, Doughboy Bay, Stewart Island, New Zealand

Cited by 18 publications

References 41 publications

Coastal dune mobility over the past century: A global review

Coastal dune mobility over the past century: A global review

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

Changes in the vegetation cover of transgressive dune fields: A case study in Cape Woolamai, Victoria

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