Sediment Quality Sampling Design for Darwin Harbour
Brinkman, Richard; Logan, Murray; Northern Territory. Department of Environment and Natural Resources; Australian Institute of Marine Science
E-Publications; E-Books; PublicationNT; Report Number 44/2019
In the context of increasing development and associated pressures, this project aims to inform the development of a first systematic, long-term, sediment monitoring program for Darwin Harbour which takes into consideration the physicochemical nature of Darwin Harbour sediment and the oceanographic processes which will influence the movement of contaminated sediment in the Harbour. The rationale for the program is that seabed and estuarine sediments are both an extensive habitat and the ultimate repository for many contaminants that enter waterways. In addition, monitoring of contaminants in sediment may facilitate the identification of increasing contaminant loads in the Harbour which may not be detected by water monitoring programs due to the high flushing rate within Darwin Harbour and infrequent water sample collection.
Made available by via Publications (Legal Deposit) Act 2004 (NT).
1. Executive summary -- 2. Introduction -- 3. Methods -- 3.1 Overview of methodology -- 3.2 Tidal Hydrodynamics -- 3.3 Wave Dynamics -- 3.4 Sediment Modelling -- 3.5 Sediment sampling design analysis -- 4. Results -- 4.1 Tidal and wave driven hydrodynamic processes -- 4.2 Sediment transport modelling -- 4.3 Sediment characteristics from previous sampling programs -- 4.4 Sediment sampling design analysis -- 4.4.1 Existing chemical sediment data, Outer Harbour sediment monitoring data, and designated sampling sites -- 4.4.2 Hydrodynamic modelling layers -- 4.4.3 Exclusion zone masks -- 4.5 Spatial Model fitting -- 4.5.1 Background on statistical techniques for designing sediment sampling program -- 4.5.2 Results from statistically derived sampling design - East Arm -- 4.5.3 Results from statistically derived sampling design - Outer Harbour -- 4.5.4 Representation of sampling sites mapped with hydrodynamic and sediment modelling parameters -- 4.6 Harbour Sediment Zonation, and conceptual representation: -- 5 Conclusions -- 6 References -- 7 Appendix 1
Sediment quality; Tidal hydrodynamics; sediment sampling; design analysis
Northern Territory Government
Report Number 44/2019
43, 74 pages : colour maps ; 30 cm
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
-15 0 25 50 75 100 Fines % Sand % Gravel % Grain size category % A bu nd an ce in s ed im en ts Figure 14: The percentage abundance of different sediment grain sizes observed across the Offsets Outer Harbour sediment sampling program. The distribution of hydrodynamic seabed shear stress and velocity (Figure 15) had an initial valley at 0.3. The distribution of wave derived seabed shear stress and velocity is illustrated in Figure 16, however, and suggests that the majority of the Outer Harbour was un-affected by high erosive wave shear forces.
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