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
-29 The conditioned latin hypercube sampling technique consistently outperforms the other techniques. Interestingly, there was very little difference between the 2D and nD Spatially balanced designs. This suggests that either the sediment chemicals were relatively homogeneous over space or else patterns in one chemical species was countered by patterns in another chemical species. The conditioned latin hypercube sampling technique appeared to be able to tune its design on the underlying sediment chemical patterns better than the spatially balanced designs. Thus if the above assumptions are reasonable and the main intention of the sampling was to be able to describe the patterns in the sediment chemicals, then the sampling design derived from this technique seems most appropriate. If however, the purpose of the sampling design was be provide an unbiased representative sample of the general conditions across the spatial domain, then it could be argued that the 2D spatially balanced design was most appropriate - particularly if there was any doubt in the above assumptions.
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