Hawkesbury River Sediment Contaminant and Nutrient Analysis

140 sediment samples from the Hawkesbury River system in New South Wales, Australia, were analyzed for texture, heavy metals, organochlorine pesticides, and nutrients. The dataset, published by the Australian Ocean Data Network, provides an integrated assessment of environmental impact in this large coastal catchment. The analysis reflects conditions at the time of sampling, with the record last updated in April 2026.

Use Cases

• Correlate sediment texture (gravel, sand, mud) with concentrations of heavy metals like Cd, Cu, Pb, and Zn to understand pollutant binding and transport.
• Identify sources of contamination by analyzing spatial patterns of organochlorine pesticides (DDT, DDD, DDE, chlordanes) and heavy metals relative to land use (urbanization, marinas, sewage treatment).
• Assess eutrophication risk by modeling the relationship between sediment nutrient levels (organic P, available P, total P, TOC, TKN) and potential for algal blooms in the upper river reaches.
• Compare contaminant profiles (heavy metals, pesticides, nutrients) between the main river channel and impacted tributaries like Cowan Creek to evaluate the effect of localized industrial and recreational activities.

Strengths

• Analysis of 140 distinct sediment samples provides a substantial spatial snapshot of the catchment.
• Measures a wide range of contaminants including 8 heavy metals, over 10 organochlorine pesticides, and multiple nutrient fractions.

Limitations

• Sample size of 140 may limit granular spatial analysis or robust statistical modeling for rare contaminants.
• Data is presented in report format (PDF/HTML), not a structured, machine-readable table, requiring extraction for computational use.
• Temporal coverage is a single snapshot; it does not provide time-series data to track changes in contaminant levels.

Provenance

Source

Australian Ocean Data Network

Collection Method

Laboratory analysis of physically collected sediment samples.

Freshness

Record metadata indicates a last update in April 2026, but the underlying study and sample collection date is not specified.

Geography

Hawkesbury River catchment, New South Wales, Australia, from Windsor to Broken Bay.