A Surface Model for Aeolian Dune Topography
- 572 Downloads
A surface model for aeolian bedform topography is adapted from a surface model of subaqueous bedform topography. The aeolian bedform surface model is developed using a uniform grid with a cell-centered finite volume approximation of the sediment continuity equation. The resulting modeling framework approximates the dynamic motions of aeolian bedform topography driven by bedform field boundary conditions. The numerical model is applied to simulate bedforms growing from unimodal and bimodal transport regimes from both a fixed elevation (sediment source area) and within a domain with fully periodic boundary conditions. The rates at which modeled aeolian bedforms grow and morphologically mature are sensitive to the chosen boundary conditions. Video files of model simulations and source code for the presented aeolian bedform surface modeling framework are available in supplemental materials. The aeolian bedform surface model code is malleable and readily modified for exploratory study of dynamic bedform topography that inherits morphological traits from aeolian bedform field boundary conditions.
KeywordsAeolian Dune Bedform Exploratory numerical model
Caroline Hern generously provided continuous feedback and conceptual steering for this project. We thank Matthew Wolinsky and Mauricio Perillo for helpful guidance and suggestions concerning code development. The authors are grateful for the thoughts and comments provided by Roussos Dimitrakopoulos and Brad Murray during the revision of this manuscript. Funding for this work was provided by Shell International Exploration & Production Inc. This work does not reflect the views of Shell International Exploration & Production Inc.
- Bagnold RA (1941) The physics of blown sand and desert dunes. Methuen, LondonGoogle Scholar
- Diniega S (2010) Modeling aeolian dune and dune field evolution. Dissertation, The University of ArizonaGoogle Scholar
- Exner FM (1925) Über die Wechselwirkung zwischen Wasser und Geschiebe in Flüssen (in German). Sitz Acad Wiss Wien Math Naturwiss Abt 2a 134:165–203Google Scholar
- Kocurek G, Townsley M, Yeh E, Havholm K, Sweet M (1992) Dune and dune-field development on Padre Island, Texas, with implications for interdune deposition and water-table-controlled accumulation. J Sediment Res 62(4):Google Scholar
- Meyer-Peter E, Müller R (1948) Formulas for bed-load transport. Proceedings of the 2nd meeting. IAHR, Stockholm, pp 39–64Google Scholar
- Press WH, Teukolsky S, Vetterling W, Flannery B (1988) Numerical recipes in C. Cambridge University Press, CambridgeGoogle Scholar