A Multidisciplinary Approach to Studying the Nature and Occurrence of Saline Groundwater in the Gulf Islands
Bibliographic record
Abstract
A multidisciplinary study involving hydrogeochemical sampling and borehole geophysics was undertaken to study the nature and occurrence of saline groundwater on two islands in British Columbia, Canada. Saturna and Hornby Islands are located at the south and north ends, respectively, of the Canadian Gulf Islands situated off the lower mainland of British Columbia. Two large-scale geochemical sampling programs were undertaken to investigate the spatial distribution of saline groundwater and to describe the geochemical evolution of groundwater in the fractured aquifer systems. Major ion chemistry indicates that cation exchange between calcium-rich waters and sodium-rich sites complicates a simple mixing trend, and saline waters appear to represent mixing either between fresh type (calcium bicarbonate) groundwater and seawater (recent saltwater intrusion) or sodium-rich groundwater and seawater (resident saline waters). Sodium-rich exchange sites are speculated to be a remnant of ocean water intrusion during the Pleistocene when the islands were submerged. As a result of its high mobility and conservative nature, chloride has been flushed from the shallow bedrock during a process of natural desalinization, but may remain trapped in the pores and fractures at depth, giving rise to a transitional saltwater wedge. Modern saltwater intrusion, brought about by increased development on the islands, is now competing with natural desalinization along the coast, and has left many drinking water supplies contaminated. Borehole geophysical logs from coastal wells confirm that saline groundwater is present at depth, and that its occurrence is related to fracture locations.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.004 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".