Arid
DOI10.1016/j.geomorph.2016.10.033
Environmental controls, morphodynamic processes, and ecogeomorphic interactions of barchan to parabolic dune transformations
Yan, Na1,2; Baas, Andreas C. W.3
通讯作者Yan, Na
来源期刊GEOMORPHOLOGY
ISSN0169-555X
EISSN1872-695X
出版年2017
卷号278页码:209-237
英文摘要

The transformation of barchans into parabolic dunes has been observed in various dune systems around the world. Precise details of how environmental controls influence the dune transformation and stabilisation mechanism, however, remain poorly understood. A ’horns-anchoring’ mechanism and a ’neblchas-initiation’ mechanism have previously been proposed and selected environmental controls on the transformation have been explored by some modelling efforts, but the morphodynamic processes and eco-geomorphic interactions involved are unclear and comparison between different dune systems is challenging. This study extends a cellular automaton model, informed by empirical data from fieldwork and remote sensing, to fully explore how vegetation characteristics, boundary conditions, and wind regime influence the transformation process and the resulting dune morphologies. A ’dynamic growth function’ is introduced for clump-like perennials to differentiate between growing and non-growing seasons and to simulate the development of young plants into mature plants over multiple years. Modelling results show that environmental parameters interact with each other in a complex manner to impact the transformation process. The study finds a fundamental power-law relation between a non-dimensional parameter group, so-called the ’dune stabilising index’ (S.), and the normalised migration distance of the transforming dune, which can be used to reconstruct paleo-environmental conditions and monitor the impacts of changes in climate or land-use on a dune system. Four basic eco-geomorphic interaction zones are identified which bear different functionality in the barchan to parabolic dune transformation. The roles of different environmental controls in changing the eco-geomorphic interaction zones, transforming processes, and resulting dune morphologies are also clarified. (C) 2016 Elsevier B.V. All rights reserved.


英文关键词Barchan Parabolic dune Morphodynamic process Vegetation Eco-geomorphic interaction CA modelling
类型Article
语种英语
国家England
收录类别SCI-E
WOS记录号WOS:000392555000016
WOS关键词VEGETATION COVER ; COASTAL DUNES ; CONCEPTUAL-FRAMEWORK ; NORTH QUEENSLAND ; CLIMATIC CHANGES ; SAND TRANSPORT ; WIND ; DESERT ; FIELDS ; BRAZIL
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构University of London
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/199260
作者单位1.Kings Coll London, Dept Geog, London WC2R 2LS, England;
2.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England;
3.Kings Coll London, Dept Geog, London WC2R 2LS, England
推荐引用方式
GB/T 7714
Yan, Na,Baas, Andreas C. W.. Environmental controls, morphodynamic processes, and ecogeomorphic interactions of barchan to parabolic dune transformations[J]. University of London,2017,278:209-237.
APA Yan, Na,&Baas, Andreas C. W..(2017).Environmental controls, morphodynamic processes, and ecogeomorphic interactions of barchan to parabolic dune transformations.GEOMORPHOLOGY,278,209-237.
MLA Yan, Na,et al."Environmental controls, morphodynamic processes, and ecogeomorphic interactions of barchan to parabolic dune transformations".GEOMORPHOLOGY 278(2017):209-237.
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