Niue Island is a 259 km² raised coral atoll where the classical Ghyben-Herzberg freshwater lens does not exist. Electrical resistivity probes indicate the freshwater layer thickness varies from 40-80 m in the island's center to 50-170 m beneath the former atoll rim, decreasing to zero within 500 m of the coast. The data, from Geoscience Australia, includes findings from drilling, gravity, and magnetic surveys, with aquifer tests indicating a safe long-term pumping rate of about 8 l/s.
Use Cases
- Modeling freshwater lens geometry and safe yield based on thickness and recharge data
- Analyzing aquifer properties based on specific capacity and pumping rate tests
- Studying saltwater intrusion patterns based on coastal mixing along limestone fissures
- Investigating subsurface geology based on limestone depth and volcanic bedrock interface
Strengths
- Includes specific numerical measurements: island area of 259 km², freshwater layer thickness from 40-170 m, and safe yield estimates.
- Integrates multiple geophysical survey methods: drilling, electrical resistivity, gravity, and magnetic data.
- Provides concrete aquifer performance metrics: specific capacity of about 12 l/s per metre and safe pumping rate of about 8 l/s.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment.
- Data is presented in HTML/PDF formats, which may require extraction for computational analysis.
Provenance
- Source
- Geoscience Australia Data
- Collection Method
- Likely contains results from field drilling, electrical resistivity depth probes, gravity surveys, magnetic surveys, and aquifer tests.
- Time Range
- null
- Freshness
- Last updated 2026-03-25 19:13:27.582048; freshness should be verified.
- Geography
- Niue Island, South Pacific Ocean