%0 Journal Article %T Morphodynamics of barchan and dome dunes under variable wind regimes %+ Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, 818 South Beijing Rd, Urumqi 830011, Xinjiang, Peoples R China %+ Institut de Physique du Globe de Paris (IPGP) %+ Institut de Physique du Globe de Paris (IPGP) %A Gao, Xin %A Gadal, Cyril %A Rozier, Olivier %A Narteau, Clement %Z National Thousand Talents Program of China Y772091001High-level Talent Recruitment Program of Xinjiang Uygur Autonomous Region Y742071001"the Belt and Road" Special Project 131965KYSB20170038UnivEarthS LabEx program of Sorbonne Paris Cite ANR-10-LABX-0023ANR-11-IDEX-0005-02French National Research Agency (ANR)ANR-17-CE01-0014/SONO %< avec comité de lecture %@ 0091-7613 %J Geology %I Geological Society of America %V 46 %N 9 %P 743-746 %8 2018-07-19 %D 2018 %R 10.1130/G45101.1 %Z Sciences of the Universe [physics] %Z Sciences of the Universe [physics]/Earth SciencesJournal articles %X Dome dunes are traditionally interpreted as a transient or an independent class of bed-forms because of their rounded and smooth shape without slipfaces. Here we show that they can also reach a steady state and form dome dune fields, which entail the same interactions between flow, bed topography, and moving sediment as other dune types in the absence of grain-size segregation and vegetation. We study the transition from barchan to dome dunes by increasing the standard deviation of a normal distribution of sand flux orientation in a numerical model. We find that, under steady-state conditions, barchan and dome dunes exhibit the same relationships between their height and migration rate. As shown in Earth's deserts, dome dune shape and migration rate can then be used to estimate sand flux properties, including the variability in transport directionality. %G English %L insu-02925047 %U https://insu.hal.science/insu-02925047 %~ INSU %~ UNIV-PARIS7 %~ AFRIQ %~ CNRS %~ IPGP %~ USPC %~ SORBONNE-UNIVERSITE %~ UNIV-PARIS %~ ANR %~ ALLIANCE-SU