Coastal dunes

Pye, Kenneth

doi:10.1177/030913338300700403

Cited by 126 publications

(72 citation statements)

References 73 publications

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“…The presence of plants causes the deposition of sand (e.g., Hesp, 1989;Arens 1996;Kuriyama et al, 2005), leading to the formation of small dunes (Hesp, 1981;Pye, 1983). These incipient dunes have a typology that depends on the mechanism (plant, seed, rhizome, flotsam, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…The transition from washover terrace (a low surface) to a continuous dune requires individual incipient dunes to grow and merge, eventually developing into a single continuous ridge. Penland, 1988, 1990;Pye, 1983;Carter and Wilson, 1990;Davidson-Arnott and Fisher, 1992;Mathew et al, 2010;Montreuil et al, 2013). Such a conceptual model, consistent with widely observed field conditions, does not address why some initially hummocky foredunes coalesce to a linear foredune ridge, while others remain hummocky, having variable dune height in the alongshore direction, though Godfrey (1977) discussed the potential for recurring storm events to prevent the coalescing of hummocky dunes, even in locations where vegetation grows rapidly in the lateral direction.…”

Section: Introductionmentioning

confidence: 99%

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Lateral vegetation growth rates exert control on coastal foredune hummockiness and coalescing time

2017

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Abstract. Coastal foredunes form along sandy, low-sloped coastlines and range in shape from continuous dune ridges to hummocky features, which are characterized by alongshore-variable dune crest elevations. Initially scattered dune-building plants and species that grow slowly in the lateral direction have been implicated as a cause of foredune "hummockiness". Our goal in this work is to explore how the initial configuration of vegetation and vegetation growth characteristics control the development of hummocky coastal dunes including the maximum hummockiness of a given dune field. We find that given sufficient time and absent external forcing, hummocky foredunes coalesce to form continuous dune ridges. Model results yield a predictive rule for the timescale of coalescing and the height of the coalesced dune that depends on initial plant dispersal and two parameters that control the lateral and vertical growth of vegetation, respectively. Our findings agree with previous observational and conceptual work -whether or not hummockiness will be maintained depends on the timescale of coalescing relative to the recurrence interval of high-water events that reset dune building in low areas between hummocks. Additionally, our model reproduces the observed tendency for foredunes to be hummocky along the southeast coast of the US where lateral vegetation growth rates are slower and thus coalescing times are likely longer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lateral vegetation growth rates exert control on coastal foredune hummockiness and coalescing time

2017

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“…Runoff water was shown to be an important transport mechanism for plant parasites at the field level (Chabrier & Queneherve, 2008), while in coastal environments, transport in sea water is an additional possibility (de la Peña, Vandegehuchte, Bonte, & Moens, 2011). Sand dunes are subject to periodic erosion and redeposition by storms (Pye, 1983), providing ample opportunity for redistribution of organisms. Short distance dispersal trapped in mucilaginous foam at the surface (Thornton, 1999) or longer distance dispersal in vegetation rafts (Fuller, Schwarz, & Tierney, 2005) are theoretically possible.…”

Section: Persistence and Spread Of Populationsmentioning

confidence: 99%

Behaviour and Population Dynamics of Entomopathogenic Nematodes Following Application

Griffin

2015

Nematode Pathogenesis of Insects and Other Pests

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“…The most abundant, tallest, and youngest dune belt, which is the subject of this study, developed in association with the Tolleston Beach (184.5 m) shoreline, beginning with the Nipissing high (~4.5 ka) and continuing through to the present time (Hansel and Mickelson, 1988;Thompson, 1992). This youngest dune belt has a great variety of foredunes, blowouts and parabolic dunes, which will be described following the dune morphology classification scheme presented in Table 2 (modified after Pye, 1982Pye, , 1983Hesp, 2002). The geomorphic history of the youngest dune belt along the southern coast of Lake Michigan is revealed by the OSL sand ages collected from: (1) the Mount Baldy blowout (Table 1, …”

Section: Dune Geomorphologymentioning

confidence: 99%

“…Incipient foredunes, also known as primary, shadow, or embryo dunes (Pye, 1983), are new or developing foredunes that form within pioneer plant communities (Hesp, 2002). Incipient foredunes along southern Lake Michigan (Figure 2A) have a 1-3-m-high ramplike lakeward profile.…”

Section: Foredunesmentioning

confidence: 99%

Late Holocene dune development and shift in dune-building winds along southern Lake Michigan

Kilibarda

Venturelli

Goble

2014

Coastline and Dune Evolution Along the Great Lakes

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, "Late Holocene dune development and shift in dune-building winds along southern Lake Michigan" (2014 AbstractThe youngest dune belt along Lake Michigan's southern coast evolved through four stages. The first stage began during the Nipissing transgression, ~6.0 ka, and culminated at the Nipissing high, ~4.5 ka. Rising lake levels eroded the lake margins and generated sediment that was transported to southern Lake Michigan, creating the Tolleston barrier beach. The second stage, beginning ~4.5 ka with a rapid lake level fall and continuing to ~3.0 ka, represents a major episode of transgressive parabolic dune field development. Large, simple parabolic dunes, with easterly apices (85-105° azimuth) suggestive of westerly wind formation, developed in a sand belt ~1-2 km wide. The third stage, from ~3.0 to 1.0 ka, was characterized by strandplain progradation and transverse ridge development west of Miller, Indiana, and dune stabilization creating the Holland Paleosol east of Miller. Sporadic blowout activity from strong westerly winds redistributed the sand within the dune field, amalgamating simple dune forms into compound, rake-like, and nested parabolic dunes. The fourth and youngest stage, beginning ~1.0 ka, represents blowout development in a southeasterly direction (120-135° azimuth), indicating a wind direction shift to the northwest. Blowouts, whether developed in transverse ridges or in the northern arms of parabolic dunes, occur closest to the lake. The timing of this blowout initiation coincides with a rise in the level of Lake Michigan. However, a more likely development and maintenance mechanism for these dunes is increased storminess with strong northerly and northwesterly winds during the cooler months of the year.1

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Coastal dunes

Cited by 126 publications

References 73 publications

Lateral vegetation growth rates exert control on coastal foredune hummockiness and coalescing time

Lateral vegetation growth rates exert control on coastal foredune hummockiness and coalescing time

Behaviour and Population Dynamics of Entomopathogenic Nematodes Following Application

Late Holocene dune development and shift in dune-building winds along southern Lake Michigan

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