Comment on "Relevant Length Scale of Barchan Dunes"

TL;DR

This paper critiques a recent experimental study on scaled-down dunes by proposing an alternative data analysis that yields different conclusions, thereby questioning the original similarity hypothesis.

Contribution

It introduces a new data analysis approach that challenges prior interpretations of laboratory dune experiments, offering fresh insights into dune scaling laws.

Findings

Alternative analysis leads to different conclusions from original study

Supports the similarity hypothesis through different reasoning

Provides a new perspective on dune size scaling

Abstract

In a recent experimental breakthrough, Hersen et al. [1] demonstrated that by changing the agitating medium from air to water, one can obtain, on laboratory scale, dunes that are downsized copies of desert dunes, thereby overcoming a major obstacle for their systematic study. Here we argue in two steps (i),(ii) that an alternative data analysis leads to some conclusions that are qualitatively and quantitatively different from Hersen et al.'s but justify their similarity hypothesis on different grounds. [1] P. Hersen, S. Douady, and B. Andreotti, Phys. Rev. Lett. 89 (2002) 264301