Niue Island is a raised coral atoll with an area of 259 km² and a freshwater layer that varies from 40-170 meters thick, but disappears within 500 meters of the coast. The data, from Geoscience Australia, includes results from drilling, gravity and magnetic surveys, and aquifer tests. It describes a unique hydrogeological system where the classical freshwater lens does not exist due to fissures in the limestone.
Use Cases
- Modeling groundwater safe yield based on the described recharge conditions and aquifer thickness.
- Analyzing the irregular freshwater layer configuration based on described permeability differences in the limestone.
- Studying saltwater intrusion dynamics based on the described mixing along coastal fissures.
- Characterizing the subsurface geology based on the described Miocene limestone overlying volcanic bedrock.
Strengths
- Includes specific quantitative measurements, such as a freshwater layer thickness of 40-170 meters and a safe yield estimate of about 4000 m³/year/hectare.
- Describes a distinctive and well-studied hydrogeological system for a specific raised coral atoll (Niue Island, 259 km²).
- Data is derived from multiple survey methods, including drilling, electrical resistivity, gravity, and magnetic surveys.
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 PDF/HTML formats, which may require extraction for computational analysis.
Provenance
- Source
- Geoscience Australia Data
- Collection Method
- Drilling, electrical resistivity depth probes, gravity and magnetic surveys, and aquifer tests.
- Freshness
- Last updated 2026-04-20 01:57:04.719325; freshness should be verified.
- Geography
- Niue Island, South Pacific Ocean