Rates and patterns of bedrock denudation by coastal salt spray weathering: A seven‐year record

Mottershead, D. N.

doi:10.1002/esp.3290140504

Cited by 90 publications

(80 citation statements)

References 22 publications

(16 reference statements)

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“…A similar study by Sperling and Cooke (1985) observed a second phase of rapid breakdown in some rocks after the slower phase observed in the earlier paper. Others, such as Goudie and Viles (1995) and Mottershead (1989), observed fairly constant weathering rates. The study by Mottershead (1989) is interesting because unlike the aforementioned laboratory studies it was a field-scale study of rock weathering.…”

Section: Introductionmentioning

confidence: 98%

“…Others, such as Goudie and Viles (1995) and Mottershead (1989), observed fairly constant weathering rates. The study by Mottershead (1989) is interesting because unlike the aforementioned laboratory studies it was a field-scale study of rock weathering.…”

Section: Introductionmentioning

confidence: 98%

“…Previous studies have examined salt weathering phenomena in arid climates (both warm and cold deserts) where moisture supply is limited (Cooke, 1979;Fahey, 1985;Goudie and Viles, 1995), and coastal regions where moisture is laden with high levels of salt (Holmer, 1998;Mottershead, 1989). While chemical weathering in low latitudes is generally acknowledged as being intense (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory simulation of the salt weathering of schist: 1. Weathering of schist blocks in a seasonally wet tropical environment

Wells

Binning

Willgoose

et al. 2006

Earth Surf Processes Landf

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laboratory simulation of the salt weathering of schist: 1. Weathering of schist blocks in a seasonally wet tropical environment

Wells

Binning

Willgoose

et al. 2006

Earth Surf Processes Landf

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“…Swelling events, ranging in some extreme cases up to several millimetres, can persist for a few months up to a couple of years. They have been attributed to salt crystallization, although wetting and drying is thought to play a less important role (Kirk, 1977;Mottershead, 1989;Stephenson and Kirk, 2001). Only a few TMEM stations on the sandstone and basalt platforms in the Bay of Fundy recorded mean rates of platform swelling (rock surface elevation between measurement intervals), but they were common on the argillite platform at Mont Louis (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The gauge and probe sit on a low, triangular frame that, in use, is positioned on three metal bolts (a MEM station) permanently embedded in the rock surface (High and Hanna, 1970;Robinson, 1976). The instrument allows precise measurements to be made of slow rock downwearing (erosion in the vertical plane) and several workers have used it in the supra-and intertidal zones of rocky coasts (Kirk, 1977;Robinson, 1977;Gill and Lang, 1983;Mottershead, 1989;Stephenson and Kirk, 1998;Foote et al, 2001;Andrade et al, 2002). Unlike the MEM, which allows only three measurements to be made at each station, a traversing micro-erosion meter (TMEM) permits numerous measurements to be made within the triangular frame of the instrument (Trudgill et al, 1981;Stephenson, 1997).…”

Section: Fieldmentioning

confidence: 99%

Shore Platform Processes in Eastern Canada

Trenhaile

Porter

Kanyaya

2007

gpq

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This research is conducted on a mesotidal, argillite shore platform at Mont Louis in Gaspé, Québec, and on macrotidal platforms in the basalts of Scots Bay and the sandstones of Burncoat Head in Nova Scotia. Rock samples have been subjected to wetting and drying and to salt weathering cycles. The platforms were surveyed; rock hardness was determined with a Rock Test Hammer; waves were recorded in the field; and downwearing rates were measured at 56 micro-erosion meter stations over 1 to 3 years. Weathering is the dominant process at Mont Louis, although the horizontal platform may have been cut by waves at the high tidal level. Wave backwearing was much more important than downwearing by weathering during the Holocene at Scots Bay. Wave quarrying only occurs on a few scarps today, however, and without much abrasive material, slow downwearing now dominates over most of the platform surface. Waves probably help to remove loosened sand grains at Burncoat Head, thereby contributing to platform downwearing. Abrasion is also important in places, but the data suggest that backwearing by wave quarrying and probably frost has been a little more important than downwearing by abrasion and weathering during the Holocene.Processus des plates-formes littorales de l’est du Canada. Une plate-forme littorale d’argilites soumise à des marées modérées à Mont Louis en Gaspésie, Québec, et des plates-formes soumises à des fortes marées dans les basaltes de Scots Bay et les grès de Burncoat Head de la Nouvelle-Écosse furent étudiées. Des échantillons de roches ont été soumis à des cycles de mouillage et de séchage et d’haloclastie. Le profil des plates-formes a été mesuré, la dureté des roches a été établie par le test du marteau de Schmidt, les vagues ont été mesurées sur le terrain et le taux d’usure vertical a été quantifié à 56 stations avec des appareils détectant la micro-érosion, le tout sur une période d’un à trois ans. L’altération est le processus dominant à Mont Louis, bien que la plate-forme horizontale ait été entaillée par les vagues au maximum des marées hautes. L’usure horizontale par les vagues était plus importante que l’usure verticale par altération durant l’Holocène à Scots Bay. L’extraction de grands blocs par les vagues ne se produit toutefois de nos jours que sur quelques abrupts et, en l’absence de matériel abrasif, une lente usure verticale domine maintenant sur la plupart des plates-formes. Les vagues ont probablement aidé à éliminer les grains de sable produits par l’altération à Burncoat Head, contribuant ainsi à l’usure verticale de la plate-forme. L’abrasion est également importante à certains endroits, mais les données indiquent que l’usure horizontale par les vagues, et aussi par le gel, a été un peu plus importante que l’usure verticale par l’abrasion et l’altération durant l’Holocène

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Weathering effects on the geotechnical properties of argillaceous sediments in tropical environments and their geomorphological implications

Fan

Allison

Jones

1996

Earth Surf. Process. Landforms

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Outcrops of young, sedimentary, argillaceous rocks with well developed fabric display rapid changes in their properties when subject to tropical weathering. The change in the materials is often accompanied by mass movement activity and the geomorphological consequence in terms of landforms is usually the development of badlands topography. Detailed field and laboratory studies have been undertaken on the Joe's River Formation, Barbados, and the Lichi Melange, Taiwan. Both are sedimentary mudrocks with well developed, scaly fabrics. Physical and geotechnical laboratory tests have been conducted on samples collected from type site locations to elucidate associations between material properties, earth surface processes and landform development. While the inherent physical properties show little or no difference in the transition from unweathered to highly weathered materials, by applying the critical state model, the mudrock geotechnical properties can be shown to change significantly. As weathering commences, material strength surprisingly increases. Only after a period of more extensive weathering do mechanical properties confirm increasingly incompetent materials. The initial strength increase appears to be due to weathering-induced modification of the fabric. The subsequent strength drop is a product of weathering-induced modification of both the fabric and the in situ, intact sediment. It is suggested that by applying the critical state model, a greater consideration can be gained of the geotechnical response of the sediments to weathering.

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Rates and patterns of bedrock denudation by coastal salt spray weathering: A seven‐year record

Cited by 90 publications

References 22 publications

Laboratory simulation of the salt weathering of schist: 1. Weathering of schist blocks in a seasonally wet tropical environment

Laboratory simulation of the salt weathering of schist: 1. Weathering of schist blocks in a seasonally wet tropical environment

Shore Platform Processes in Eastern Canada

Weathering effects on the geotechnical properties of argillaceous sediments in tropical environments and their geomorphological implications

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