Quantification of the relationship between surface morphodynamics and subsurface sedimentological product in sandy braided rivers
Why this work is in the frame
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Bibliographic record
Abstract
This paper presents an integrated dataset of digital elevation models (DEMs) and ground penetrating radar (GPR) surveys from the sandy braided South Saskatchewan River, Canada. Data were collected from the same sites in 2004, 2005, 2006 and 2007, allowing the evolution of the surface morphology to be tied explicitly to its associated depositional record. The occurrence of a large flood in 2005 also allowed the influence of discharge to be assessed with respect to the process-product relationship. The data demonstrated that the morphology of the study reach evolved even with modest discharges and could become organized into planforms that were either more compound bar-dominated or unit bar-dominated. The large flood was a trigger for switching between states and caused more erosion than is normally the case. The GPR surveys quantified the extent to which the subsurface deposits (the ‘product’) were modified by the surface morphodynamics (the ‘process). They revealed that during the large flood there was an increase in the proportion of facies associated with bar margin accretion and larger dune sets. Conversely, in subsequent years these facies became truncated and replaced with facies associated with smaller dune sets. In particular, this analysis showed that unit bars generally become truncated vertically but especially laterally. Thus, they lose the high-angle bar margin deposits and the smaller-scale deposits found on their surfaces. As a result, commonly the only fragments that remain are dune sets, thus making identification of the original unit barform problematic. This unique datasets raises implications for what may ultimately become preserved in the rock record.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| 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 it