Groundwater Recharge Assessment in the Chateauguay River Watershed
Why this work is in the frame
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Bibliographic record
Abstract
L’objectif de cette étude était d’évaluer la recharge des aquifères sur le territoire du bassin versant de la rivière Châteauguay. On a utilisé le modèle HELP (Hydrologic Evaluation of Landfill Performance) pour évaluer les valeurs journalières de recharge, d’évapotranspiration et de ruissellement. On a divisé la zone d’étude en mailles de 250 × 250 m pour un total de 47 616 éléments. Les données d’entrée incluent les propriétés physiques des sols, l’utilisation du territoire, le couvert végétal et les données climatiques. Le modèle HELP a été calé sur les estimations de débit de base et de ruissellement obtenues à partir de la séparation de cinq hydrogrammes de rivière. Sur une période de 39 ans, le taux de recharge annuel moyen a été évalué à 86 mm, ou 9% des précipitations totales. Dans le bassin versant, les zones ayant des niveaux piézométriques élevés et des conditions d’écoulement de nappe libre ont été identifiées comme étant les principales zones de recharge. Les résultats journaliers indiquent que la recharge se fait principalement au printemps et à l’automne. Durant la période d’observation, les variations annuelles d’évapotranspiration et de ruissellement sont directement corrélées aux précipitations, alors que les réponses annuelles de la recharge demeurent assez constantes. Le modèle HELP a aussi été utilisé pour évaluer des scénarios potentiels de changement climatique à partir des données des années les plus sèches et les plus humides. La recharge annuelle moyenne pour l’année la plus sèche est de 51 mm et pour l’année la plus humide, de 99 mm. Les différences dans la distribution spatiale de la recharge lors des scénarios indiquent que les zones les plus sensibles aux changements climatiques sont les zones de recharge préférentielles. \n \n<h2>Abstract</h2> \nThe objective of this study was to evaluate groundwater recharge in the Chateauguay River watershed. The Hydrologic Evaluation of Landfill Performance (HELP) model was used to assess daily values of recharge, evapotranspiration and runoff. The study area was divided into a regular grid, 250 m × 250 m, for a total of 47,616 grid elements. The input parameters included soil physical properties, land use, vegetation and climate data. Calibration of HELP was carried out against runoff and baseflow estimates obtained from separation of five river hydrographs. Over a 39 year period, the mean annual recharge rate was estimated at 86 mm, or 9% of the total precipitation. Areas characterized by high water level elevations and unconfined flow conditions were identified as the main recharge areas. Daily estimates show that recharge takes place mainly in spring and fall. Over the observed period, the annual variations of evapotranspiration and runoff were directly related to changes in precipitation, whereas the annual recharge response was subdued, with much lower variations. HELP was also used to assess potential climate change scenarios using data for the driest and most humid years. The mean annual recharge was 51 mm for the driest year and 99 mm for the most humid year. Differences in the spatial distribution of recharge for the predictive scenarios indicate that the areas most sensitive to climate change correspond to the preferential recharge areas.
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.000 | 0.002 |
| Insufficient payload (model declined to judge) | 0.003 | 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