%0 Journal Article %1 WOS:000185445200008 %A Sauermann, G %A Andrade, JS %A Maia, LP %A Costa, UMS %A Araujo, AD %A Herrmann, HJ %C PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS %D 2003 %I ELSEVIER SCIENCE BV %J GEOMORPHOLOGY %K barchan dune} sand transport; velocity; {wind %N 3-4 %P 245-255 %R 10.1016/S0169-555X(02)00359-8 %T Wind velocity and sand transport on a barchan dune %V 54 %X We present measurements of wind velocity and sand flux performed on the windward side of a large barchan dune in Jericoacoara, northeastern Brazil. From the measured profile, we calculate the air shear stress using an analytical approximation and treat the problem of flow separation by an heuristic model. We find that the results from this approach agree well with our field data. Moreover, using the calculated shear velocity, we predict the sand flux according to well-known equilibrium relations and with a phenomenological continuum saltation model that includes saturation transients and thus allows for nonequilibrium conditions. Based on the field data and theoretical predicted results, we indicate the principal differences between saturated and nonsaturated sand flux models. Finally, we show that the measured dune moves with invariant shape and predict its velocity from our data and calculations. (C) 2003 Elsevier Science B.V. All rights reserved.

@article{WOS:000185445200008, abstract = {We present measurements of wind velocity and sand flux performed on the windward side of a large barchan dune in Jericoacoara, northeastern Brazil. From the measured profile, we calculate the air shear stress using an analytical approximation and treat the problem of flow separation by an heuristic model. We find that the results from this approach agree well with our field data. Moreover, using the calculated shear velocity, we predict the sand flux according to well-known equilibrium relations and with a phenomenological continuum saltation model that includes saturation transients and thus allows for nonequilibrium conditions. Based on the field data and theoretical predicted results, we indicate the principal differences between saturated and nonsaturated sand flux models. Finally, we show that the measured dune moves with invariant shape and predict its velocity from our data and calculations. (C) 2003 Elsevier Science B.V. All rights reserved.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, author = {Sauermann, G and Andrade, JS and Maia, LP and Costa, UMS and Araujo, AD and Herrmann, HJ}, biburl = {https://www.bibsonomy.org/bibtex/291939493264d45748cb26f02f93f689d/ppgfis_ufc_br}, doi = {10.1016/S0169-555X(02)00359-8}, interhash = {8c176cfc0b1a2f145e2abccd02a190e8}, intrahash = {91939493264d45748cb26f02f93f689d}, issn = {0169-555X}, journal = {GEOMORPHOLOGY}, keywords = {barchan dune} sand transport; velocity; {wind}, number = {3-4}, pages = {245-255}, publisher = {ELSEVIER SCIENCE BV}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Wind velocity and sand transport on a barchan dune}, tppubtype = {article}, volume = 54, year = 2003 }