Foredune morphodynamics and sediment budgets at seasonal to decadal scales: Humboldt Bay National Wildlife Refuge, California, USA

Rader, Alana M.; Pickart, Andrea J.; Walker, Ian J.; Hesp, Patrick A.; Bauer, Bernard O.

doi:10.1016/j.geomorph.2018.06.003

Cited by 27 publications

(21 citation statements)

References 61 publications

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“…The zone occupied by the foredune, blowouts, and narrow, long-walled parabolic dunes (hereafter the foredune complex) ranges from 50-250 m along the axis of the parabolic dunes. Incipient foredunes sometimes form as transient features that can last several years in the absence of major storm surges (Rader et al, 2018). The foredune complex forms an undulating boundary with deflation basins and plains to the east.…”

Section: Geomorphology Of the Study Areamentioning

confidence: 99%

Spatio-temporal geomorphological and ecological evolution of a transgressive dunefield system, Northern California, USA

Pickart

Hesp

2019

Global and Planetary Change

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A series of historic aerial photographs in addition to the U.S. Coast Survey 1870 map were used to document evolution of the coastal barrier and transgressive dunefield system at the Lanphere-Ma-le'l Dunes on Humboldt Bay, California, USA, between 1870 and 2016. Geomorphic units (shorelines, foredunes, nebkha, blowouts, parabolic dunes, deflation basins, and dunefields) as well as vegetation alliance were mapped in ArcGIS at approximately decadal intervals and compared among three subareas delineated based on large scale geomorphic differences that coincided with contrasting biological invasion and management histories. Sand inundation events in the 1930s and 1940s led to deterioration of the foredune and burial of deflation basins in the south, with the transgressive dunefield directly abutting the backshore in places. The transgressive dunefield in the north differentiated into parabolic dunes that decoupled from the foredune complex earlier than in the southern subareas, which have retained undifferentiated transgressive dunefields. Shoreline progradation increased dramatically following the historic

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Section: Geomorphology Of the Study Areamentioning

confidence: 99%

Spatio-temporal geomorphological and ecological evolution of a transgressive dunefield system, Northern California, USA

Pickart

Hesp

2019

Global and Planetary Change

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“…The conceptual model can be an important tool in predicting blowout development under different environmental and ecological conditions. A first step towards application could be revisiting existing field datasets (e.g., [9,13,14,22,122,123]) and evaluating measured interactions between blowout form and vegetation colonization within the lens of the new conceptual model. Subsequently we need to include these concepts into a predictive model framework able to represent the aforementioned stages and transitions.…”

Section: Discussionmentioning

confidence: 99%

“…Validation of our conceptual model should start by revisiting existing field observations (e.g., [9,13,14,22,122,123]). However, to investigate time-scales and occurrences of stage transitions across various foredune systems around the globe additional field observations on blowout dynamics become crucial.…”

Section: Calibration and Validationmentioning

confidence: 99%

Feedbacks between Biotic and Abiotic Processes Governing the Development of Foredune Blowouts: A Review

Schwarz

Brinkkemper

Ruessink

2018

JMSE

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This paper reviews the initiation, development, and closure of foredune blowouts with focus on biotic-abiotic interactions. There is a rich body of literature describing field measurements and model simulations in and around foredune blowouts. Despite this abundance of data there is no conceptual framework available linking biotic and abiotic observations to pathways of blowout development (e.g., erosional blowout growth or vegetation induced blowout closure). This review identifies morphological and ecological processes facilitating the transition between blowout development stages and sets them in the context of existing conceptual frameworks describing biotic-abiotic systems. By doing so we are able to develop a new conceptual model linking blowout development to the dominance of its governing processes. More specifically we link blowout initiation to the dominance of abiotic (physical) processes, blowout development to the dominance of biotic-abiotic (bio-geomorphological) processes and blowout closure to the dominance of biotic (ecological) processes. Subsequently we identify further steps to test the proposed conceptual model against existing observations and show possibilities to include it in numerical models able to predict blowout development for various abiotic and biotic conditions.

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“…However, their coarser spatial resolution (>10 m) are unsuitable for monitoring the heterogenous environments found at the land-sea boundary, where the mixing of terrestrial and marine realms again can give rise to mixed pixels, ultimately reducing the success of delineating key landcover types. Aside from satellite platforms, data collected during airborne campaigns both with Light Detection and Ranging (LiDAR) and optical sensors have been utilised for coastal monitoring [22]. For example, LiDAR data have been used to aid the estimation of shoreline slope and position over hundreds of kilometres of coastline [23], to conduct shoreline change analysis on centennial and intra-decadal scales [24], and to complement ground based vegetation surveys to identify major habitat types to improve understanding of the relationship between dune structure and plant species occurrence [25].…”

Section: Introductionmentioning

confidence: 99%

Tracking Fine-Scale Structural Changes in Coastal Dune Morphology Using Kite Aerial Photography and Uncertainty-Assessed Structure-from-Motion Photogrammetry

et al. 2018

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Coastal dunes are globally-distributed dynamic ecosystems that occur at the land-sea interface. They are sensitive to disturbance both from natural forces and anthropogenic stressors, and therefore require regular monitoring to track changes in their form and function ultimately informing management decisions. Existing techniques employing satellite or airborne data lack the temporal or spatial resolution to resolve fine-scale changes in these environments, both temporally and spatially whilst fine-scale in-situ monitoring (e.g., terrestrial laser scanning) can be costly and is therefore confined to relatively small areas. The rise of proximal sensing-based Structure-from-Motion Multi-View Stereo (SfM-MVS) photogrammetric techniques for land surface surveying offers an alternative, scale-appropriate method for spatially distributed surveying of dune systems. Here we present the results of an inter- and intra-annual experiment which utilised a low-cost and highly portable kite aerial photography (KAP) and SfM-MVS workflow to track sub-decimetre spatial scale changes in dune morphology over timescales of between 3 and 12 months. We also compare KAP and drone surveys undertaken at near-coincident times of the same dune system to test the KAP reproducibility. Using a Monte Carlo based change detection approach (Multiscale Model to Model Cloud Comparison (M3C2)) which quantifies and accounts for survey uncertainty, we show that the KAP-based survey technique, whilst exhibiting higher x, y, z uncertainties than the equivalent drone methodology, is capable of delivering data describing dune system topographical change. Significant change (according to M3C2); both positive (accretion) and negative (erosion) was detected across 3, 6 and 12 months timescales with the majority of change detected below 500 mm. Significant topographic changes as small as ~20 mm were detected between surveys. We demonstrate that portable, low-cost consumer-grade KAP survey techniques, which have been employed for decades for hobbyist aerial photography, can now deliver science-grade data, and we argue that kites are well-suited to coastal survey where winds and sediment might otherwise impede surveys by other proximal sensing platforms, such as drones.

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Foredune morphodynamics and sediment budgets at seasonal to decadal scales: Humboldt Bay National Wildlife Refuge, California, USA

Cited by 27 publications

References 61 publications

Spatio-temporal geomorphological and ecological evolution of a transgressive dunefield system, Northern California, USA

Spatio-temporal geomorphological and ecological evolution of a transgressive dunefield system, Northern California, USA

Feedbacks between Biotic and Abiotic Processes Governing the Development of Foredune Blowouts: A Review

Tracking Fine-Scale Structural Changes in Coastal Dune Morphology Using Kite Aerial Photography and Uncertainty-Assessed Structure-from-Motion Photogrammetry

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