A Wind Tunnel Study of the Effect of Intermediate Density Ratio on Saltation Threshold
Bibliographic record
Abstract
An expression for aeolian saltation threshold -the minimum wind speed required to initially entrain sediment particles into saltation -is used in modeling aeolian processes and the formation of aeolian landforms on Earth and other planetary bodies.Previous experiments under high-fluid-density conditions in the Venus Wind Tunnel (VWT) concluded that this threshold is a function of the ratio of the density of the particle to the density of the entraining fluid (p/).A curve for the dimensionless threshold parameter, A, as a function of (p/), was derived [Iversen et al. 1987].In this work, we revisit this curve of A(p/) using data from the Titan Wind Tunnel (TWT) [Burr et al., 2015b].We use both previous and newly collected TWT data of freestream threshold wind speed spanning a range of density ratio conditions to derive friction wind speeds and then values for A. The TWT-derived data generally overly the VWT data used to derive the density ratio curve, although showing greater variability and an apparent offset to slightly higher values.We derive a new density ratio curve from the aggregated threshold data using the same format as the previous expression but with new values for the two exponential parameters.These TWT data provide additional constraints on the transitional portion of the density ratio curve between the low density ratio conditions of flume data and the high density ratio conditions of Mars Surface Wind Tunnel data.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".