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Comparing dune migration measured from remote sensing with sand flux prediction based on weather data and model, a test case in Qatar

Michel, Sylvain and Avouac, Jean-Philippe and Ayoub, François and Ewing, Ryan C. and Vriend, Nathalie and Heggy, Essam (2018) Comparing dune migration measured from remote sensing with sand flux prediction based on weather data and model, a test case in Qatar. Earth and Planetary Science Letters, 497 . pp. 12-21. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20180615-090858454

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Abstract

This study explores validating and calibrating the wind regime predicted by Global Circulation Models (GCM) on Earth and other planets using optical remote sensing of dune dynamics. We use Spot-5 images to track the migration of 64 Barchan dunes in Qatar using the COSI-Corr technique. We estimate the volume of the dunes using a scaling law calibrated from one particular dune, which was surveyed in the field. Using volume and migration rate, we determine the sand flux from a single dune, Q_(Dunes), and scale this estimate to the whole dune field. We compare the measured sand flux with those derived from wind velocity measurements at a local meteorological station as well as with those predicted from ERA-Interim (a Global Circulation Model). The comparison revealed that the wind velocity predicted by ERA-Interim is inappropriate to calculate the sand flux. This is due to the 6-h sampling rate and to systematic bias revealed by a comparison with the local wind data. We describe a simple procedure to correct for these effects. With the proposed correction, similar sand flux are predicted using the local and ERA-Interim data, independently of the value of the value of the shear velocity threshold, u_(*t). The predicted sand flux is about 65% of Q_(Dunes). The agreement is best assuming the value u_(*t)=0.244 m/s, which is only slightly larger than the value of u_(*t)=0.2612 m/s estimated based in the sand granulometry measured from field samples. The influence of the dune topography on the wind velocity field could explain the underestimation. In any case, the study demonstrates the possibility of validating GCM model and calibrating aeolian sand transport laws using remote sensing measurements of dune dynamics and highlights the caveats associated to such an approach.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.epsl.2018.05.037DOIArticle
ORCID:
AuthorORCID
Michel, Sylvain0000-0001-7878-6603
Avouac, Jean-Philippe0000-0002-3060-8442
Ewing, Ryan C.0000-0001-6337-610X
Additional Information:© 2018 Elsevier B.V. Received 23 January 2018, Revised 7 May 2018, Accepted 21 May 2018, Available online 15 June 2018. This study has been partially funded by the King Abdullah City for Science and Technology. Essam Heggy is funded by the United States Agency for International Development (USAID) under the Further Advancing the Blue Revolution Initiative (FABRI-Grant#1001624-13S-19790). We thank Michel Louge for the meteorological station data in Qatar and for his comments and suggestions. Collection of local wind data was made possible by grant NPRP 6-059-2-023 from the Qatar National Research Fund. The Spot-5 images (Copyright CNES) were acquired through the ISIS program. The use of the Spot data was made possible by the grant Earthquakes without Frontiers(NE/M017559/1). We thank Giovanni Scabbia, Annamaria Mazzoni and Jonathan Normand for their help during the fieldwork. We thank Simona Bordoni for the insightful discussion and help regarding in particular the use of the GCM and ERA-Interim data.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
King Abdullah City for Science and TechnologyUNSPECIFIED
United States Agency for International Development (USAID)1001624-13S-19790
Qatar National Research Fund6-059-2-023
Earthquakes without FrontiersNE/M017559/1
Subject Keywords:dunes dynamics; wind; remote sensing; planetary geomorphology; global circulation model
Record Number:CaltechAUTHORS:20180615-090858454
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180615-090858454
Official Citation:Sylvain Michel, Jean-Philippe Avouac, François Ayoub, Ryan C. Ewing, Nathalie Vriend, Essam Heggy, Comparing dune migration measured from remote sensing with sand flux prediction based on weather data and model, a test case in Qatar, Earth and Planetary Science Letters, Volume 497, 1 September 2018, Pages 12-21, ISSN 0012-821X, https://doi.org/10.1016/j.epsl.2018.05.037. (https://www.sciencedirect.com/science/article/pii/S0012821X18303200)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87146
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Jun 2018 18:25
Last Modified:15 Jun 2018 18:25

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