Comparison of Sequential and Variational Streamflow Assimilation Techniques for Short-Term Hydrological Forecasting
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Bibliographic record
Abstract
This study compares sequential and variational streamflow assimilation techniques for short-term hydrological forecasting based on a lumped conceptual rainfall-runoff model and two dissimilar watersheds (Canada and Germany). The assessment targets the Ensemble Kalman filter (EnKF) and variational data assimilation (VDA). Deterministic streamflow forecasts are computed on a daily time step over a 10-day forecast horizon, using meteorological observations as inputs to the model. Results show that the EnKF leads to the highest performance for all forecast horizons while the optimal set-up for the VDA, which often competes with the EnKF, varies from one watershed to the other. EnKF surpasses forecasts without assimilation for all horizons and for both watersheds where the NSE varies between 0.88 and 0.79 on the au Saumon watershed in Canada and between 0.92 and 0.87 on the Schlehdorf watershed in Germany on a 10-day horizon, which is not always true for the VDA. The naïve output assimilation is also assessed and is only helpful for the first two days of the forecasts.
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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 | 0.001 | 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 | 0.000 |
| 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