DOI: 10.5281/zenodo.3362551
title: Data for Aeolian Ripple Migration and Associated Creep Transport Rates

description: <strong>Overview:</strong> The attached spreadsheet, "AeolianRippleMigration_ShermanEtAl2019.csv," summarizes the ripple migration and related data acquired from the wind tunnel and field experiment literature and from the field experiments at Jericoacoara, Ceará, Brazil (2008) and Oceano, California, USA (2015), associated with the article "Aeolian Ripple Migration and Associated Creep Transport Rates" by Douglas J. Sherman, Pei Zhang, Raleigh L. Martin, Jean T. Ellis, Jasper F. Kok, Eugene J. Farrell, and Bailiang Li. <br> <strong>Key to data sources:</strong> * indicates that the data from a particular study were included in our final analyses § indicates an estimate of threshold shear velocity (calculated as per Lorenz et al., 2011) with A = 0.1 † the value for ripple height in this study is the average of about 200 measurements for ripples in equilibrium or near-equilibrium with the wind field ‡ the data from this study were digitized as depicted in terms of ust/ust_th and u_r/(gd)^0.5 (see "Key to variables" below) ¶ Shear velocity (ust) values are from Martin & Kok, 2017. Median grain diameter (d) and threshold shear velocity (ust_th) values are from Martin & Kok, 2018 (see Table 2: "Date interval") <br> <strong>Key to variables [units]:</strong> Source - literature origin of previous studies or field location of observations for this study StudyType - classified as "field" or "wind tunnel" Date - date of observation for observations at Jericoacoara and Oceano ("N/A" for other sites) StartTime - start time of observation window (local time) for observations at Jericoacoara and Oceano ("N/A" for other sites) EndTime - end time of observation window (local time) for observations at Jericoacoara and Oceano ( "N/A" for other sites) u_r [mm/s] - calculated ripple migration speed ( "N/A" for Zhu et al, 2011, see "u_r_alt" below) sigma_u_r [mm/s] - uncertainty in ripple migration speed. Calculated as fixed percentage for Jericoacoara and as standard error for Oceano. For literare-derived values, "N/A" indicates lack of uncertainty estimates. For Oceano, "N/A" indicates inability to calculate standard error for certain measurement intervals containing only a single observation. u_r_alt - dimensionless proxy values for ripple migration speed for Zhu et al, 2011 (marked as "N/A" for other sites) calculated as u_r/(gd)^1/2, where "g" is gravitational acceleration and "d" is median surface grain diameter ust [m/s] - shear velocity ( "N/A" for Zhu et al, 2011, see "ust_over_ust_th" below) d [mm] - median surface grain diameter ("N/A" if not reported for literature studies) ust_th [m/s] - threshold shear velocity ("N/A" for Zhu et al, 2011, see "ust_over_ust_th" below) ust_over_ust_th - dimensionless proxy values for shear velocity for Zhu et al, 2011 (marked as "N/A" for other sites) calculated as ust/ust_th length [mm] - ripple wavelength ("N/A" if not reported or measured) height [mm] - ripple amplitude ("N/A" if not reported or measured) sigma_height [mm] - uncertainty in ripple amplitude. Calculated as fixed percentage for Jericoacoara and as standard error for Oceano. For literare-derived values, "N/A" indicates lack of uncertainty estimates. For Oceano, "N/A" indicates inability to calculate standard error for certain measurement intervals containing only a single observation. <br> <strong>References:</strong> Andreotti, B.; Claudin, P.; Pouliquen, O. Aeolian Sand Ripples : Experimental Study of Fully Developed States. 2006, 028001, 1-4. Borsy, Z. A homokfodrok. Fldrajzi rtesito 1973, 22, 109-115. Cheng, H.; Liu, C.; Zou, X.; Li, J.; He, J.; Liu, B.; Wu, Y.; Kang, L.; Fang, Y. Aeolian creeping mass of different grain sizes over sand beds of varying length. Journal of Geophysical Research: Earth Surface 2015, 120, 1404-1417. Cornish, V. On the formation of sand-dunes. The Geographical Journal 1897, 9, 278-302. Kindle, E.M. Recent and fossil ripple-mark; Canada Department of Mines, Geological Survey: 1917; pp 9-29. Ling, Y.-q.; Qu, J.-j.; Li, C.-z. Study on sand ripple movement with close shoot method. Journal of Desert Research 2003, 23, 118-120. Lorenz, R.D. Observations of wind ripple migration on an Egyptian seif dune using an inexpensive digital timelapse camera. Aeolian Research 2011, 3, 229-234. Martin, R.L.; Kok, J.F. Aeolian saltation fieldwork 30-minute wind and saltation values (Dataset). Zenodo, https://doi.org/10.5281/zenodo.291798: 2017. Martin, R.L., Kok, J.F. Distinct Thresholds for the Initiation and Cessation of Aeolian Saltation From Field Measurements. Journal of Geophysical Research - Earth Surface 2018, 123, 1546–1565. https://doi.org/10.1029/2017JF004416 Seppälä, M.; Lindé, K. Wind tunnel studies of ripple formation. Geografiska Annaler: Series A, Physical Geography 1978, 60, 29-42. Sharp, R.P. Wind ripples. The Journal of Geology 1963, 71, 617-636. Stone, R.O.; Summers, H.J. Study of Subaqueous and Subaerial Sand Ripples; University of Southern California: Los Angeles, 1972. Zhu, W. Investigations on the formation and evolution of aeolian sand ripples. Lanzhou University, 2011.
description: Work at Jericoacoara was supported by a U.S. National Science Foundation (NSF) grants #1063441 to JTE and #1061335 to DJS. Data analysis was partly supported by National Science Foundation of China, grant number 41771006. This project is registered with the Brazilian Ministry of the Environment, Sistema de Autorização e Informação em Biodiversidade, Number 18038-1. Work at Oceano was supported by NSF Postdoctoral Fellowship EAR-1249918 to RLM and NSF grant AGS-1358621 to JFK, and initial Oceano ripple analyses were executed by Kenyon Chow. Research was also sponsored by the Army Research Laboratory and was accomplished under grant number W911NF-15-1-0417. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.