%0 Journal Article %1 WOS:000273178700011 %A Parteli, Eric J R %A Duran, Orencio %A Tsoar, Haim %A Schwaemmle, Veit %A Herrmann, Hans J %C 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA %D 2009 %I NATL ACAD SCIENCES %J PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA %K aeolian and critical erosion formation; phenomena; sedimentation} transport; {pattern %N 52 %P 22085-22089 %R 10.1073/pnas.0808646106 %T Dune formation under bimodal winds %V 106 %X The study of dune morphology represents a valuable tool in the investigation of planetary wind systems-the primary factor controlling the dune shape is the wind directionality. However, our understanding of dune formation is still limited to the simplest situation of unidirectional winds: There is no model that solves the equations of sand transport under the most common situation of seasonally varying wind directions. Here we present the calculation of sand transport under bimodal winds using a dune model that is extended to account for more than one wind direction. Our calculations show that dunes align longitudinally to the resultant wind trend if the angle theta(w) between the wind directions is larger than 90 degrees. Under high sand availability, linear self dunes are obtained, the intriguing meandering shape of which is found to be controlled by the dune height and by the time the wind lasts at each one of the two wind directions. Unusual dune shapes including the ``wedge dunes'' observed on Mars appear within a wide spectrum of bimodal dune morphologies under low sand availability.

@article{WOS:000273178700011, abstract = {The study of dune morphology represents a valuable tool in the investigation of planetary wind systems-the primary factor controlling the dune shape is the wind directionality. However, our understanding of dune formation is still limited to the simplest situation of unidirectional winds: There is no model that solves the equations of sand transport under the most common situation of seasonally varying wind directions. Here we present the calculation of sand transport under bimodal winds using a dune model that is extended to account for more than one wind direction. Our calculations show that dunes align longitudinally to the resultant wind trend if the angle theta(w) between the wind directions is larger than 90 degrees. Under high sand availability, linear self dunes are obtained, the intriguing meandering shape of which is found to be controlled by the dune height and by the time the wind lasts at each one of the two wind directions. Unusual dune shapes including the ``wedge dunes'' observed on Mars appear within a wide spectrum of bimodal dune morphologies under low sand availability.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA}, author = {Parteli, Eric J R and Duran, Orencio and Tsoar, Haim and Schwaemmle, Veit and Herrmann, Hans J}, biburl = {https://www.bibsonomy.org/bibtex/28c9372cbea6e58d5fdebab254b8e1d98/ppgfis_ufc_br}, doi = {10.1073/pnas.0808646106}, interhash = {ea2a6ff887e66e4da72c4b8cd1fd144e}, intrahash = {8c9372cbea6e58d5fdebab254b8e1d98}, issn = {0027-8424}, journal = {PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA}, keywords = {aeolian and critical erosion formation; phenomena; sedimentation} transport; {pattern}, number = 52, pages = {22085-22089}, publisher = {NATL ACAD SCIENCES}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Dune formation under bimodal winds}, tppubtype = {article}, volume = 106, year = 2009 }