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Longitudinal dunes can move sideways
Author(s) -
Hesp Patrick,
Hyde Robert,
Hesp Virginia,
Zhengyu Qian
Publication year - 1989
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.3290140510
Subject(s) - geology , aeolian processes , geomorphology , accretion (finance) , prevailing winds , sand dune stabilization , physical geography , paleontology , geography , oceanography , physics , astrophysics
Longitudinal dunes occur in all major sand areas in the world. Their dominant mode of migration or extension is considered to be either prevailing‐ or resultant wind‐parallel, the dunes extending downwind via accretion of the terminal nose. In the Qaidam Pendi in Northwest China a series of active longitudinal dunes extend downwind at 5–10 m yr −1 . Internal sedimentary structures examined in the dunes, however, display beds dipping in one direction rather than two opposed directions as is expected. Analysis of aerial photographs confirms that these dunes migrate laterally up to three metres per year, whilst maintaining a symmetrical longitudinal dune morphology.