Booming sand dunes: field measurements
"Booming dunes" are large desert sand dunes that make a loud droning or humming noise during an avalanching of sand. The phenomenon has been observed for censturies, yet it remains largely unexplained. This note demonstrates that the booming frequency does not scale with the size of the particle or with the shearing speed of the avalanching sand. Instead, the dune may act as a waveguide with a fundamental frequency that depends on the sound speed within the dune and the depth of the loose dry sand layer.
We wish to thank Prof. Ron Scott, Prof. Norman Brooks, Prof. Lee Silver, Dr. Steve Hostler, Dr. Gustavo Joseph, Steve Gao, Nora DeDontney, Angel Ruiz-Angulo, Fu-Ling Yang, Patricio Romano-Pringles, and A. Ransom Williams.
Submitted - BRA226.pdf