Arid
DOI10.1016/j.geomorph.2010.11.005
Meso-scale aeolian sediment input to coastal dunes: The nature of aeolian transport events
Delgado-Fernandez, Irene; Davidson-Arnott, Robin
通讯作者Delgado-Fernandez, Irene
来源期刊GEOMORPHOLOGY
ISSN0169-555X
EISSN1872-695X
出版年2011
卷号126期号:1-2页码:217-232
英文摘要

Observations of aeolian transport in coastal areas have focused on short-term experiments because of limitations imposed by instrumentation. This paper uses a case study at Greenwich Dunes, Prince Edward Island National Park, Canada, to analyze how sediment transport takes place at the beach over periods of weeks to months. A monitoring station provided hourly time series of vegetation cover, shoreline position, fetch distances, surficial moisture content, presence of ice and snow, wind speed and direction and transport processes over nine months. Analysis shows that high wind speeds may not generate any net transport into the dunes because of the limitations imposed by snow/ice cover, moisture, and short fetch distances. Despite extreme winds during intense storms, such events often lead to wave scarping rather than aeolian sediment input to the foredunes. When sediment was transported on the beach, the magnitude was regulated by a combination of factors including: angle of wind approach, fetch distance, moisture content, and duration of the wind event. In particular, angle of wind approach (and therefore fetch distance) may demote a high magnitude wind event with strong transport potential to one with no transport at all, which poses challenges for predicting the effects of individual storms over the course of several months. A significant proportion of sediment delivery to the foredunes was associated with wind events of low to medium magnitude. It is suggested here that large magnitude wind events have low probabilities of resulting in transport towards the foredune because factors such as wave inundation play an increasing role in preventing sediment movement across the beach. This has implications for modelling and management, and highlights differences between the magnitude and frequency of aeolian transport events in the coastal environment compared to those in deserts and to fluvial sediment transport. (C) 2010 Elsevier B.V. All rights reserved.


英文关键词Meso-scale Event frequency Event magnitude Foredune budget
类型Article
语种英语
国家Canada
收录类别SCI-E
WOS记录号WOS:000287055000017
WOS关键词PRINCE-EDWARD-ISLAND ; SAND TRANSPORT ; SURFACE MOISTURE ; WATER-CONTENT ; AIR-FLOW ; BEACH ; WIND ; FOREDUNE ; DYNAMICS ; THRESHOLDS
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/168263
作者单位Univ Guelph, Dept Geog, Guelph, ON N1G 2W1, Canada
推荐引用方式
GB/T 7714
Delgado-Fernandez, Irene,Davidson-Arnott, Robin. Meso-scale aeolian sediment input to coastal dunes: The nature of aeolian transport events[J],2011,126(1-2):217-232.
APA Delgado-Fernandez, Irene,&Davidson-Arnott, Robin.(2011).Meso-scale aeolian sediment input to coastal dunes: The nature of aeolian transport events.GEOMORPHOLOGY,126(1-2),217-232.
MLA Delgado-Fernandez, Irene,et al."Meso-scale aeolian sediment input to coastal dunes: The nature of aeolian transport events".GEOMORPHOLOGY 126.1-2(2011):217-232.
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