Territory Stories

Darwin Harbour in good health

Details:

Title

Darwin Harbour in good health

Member

Westra Van Holthe, Willem

Political affiliation

Country Liberals

Collection

Media Releases for 12th Assembly 2012 - 2016; Media Releases; ParliamentNT

Date

2015-03-04

Location

Darwin

Notes

Made available by via the Publications (Legal Deposit) Act 2004 (NT)

Language

English

Subject

Oceans; Marine life

Publisher name

Northern Territory Government

File type

application/pdf

Use

Issued as a Media Release

Copyright owner

Northern Territory Government

Parent handle

https://hdl.handle.net/10070/254788

Citation address

https://hdl.handle.net/10070/528215

Related items

https://hdl.handle.net/10070/528211; https://hdl.handle.net/10070/528213

Page content

12 5.1.1. Dissolved Oxygen saturation Median dissolved oxygen ranged from 107% (Shoal Bay) to 88% saturation (Buffalo creek). Values for DO% were generally lower in the upper reaches of the harbour and higher in the outer zones such as the main body to outer harbour reporting zone. Results did not always comply with the WQO, for example elevated DO was observed in Shoal Bay (119%), Middle Harbour (105%) and Buffalo Creek (103%). These higher values were typically short-lived episodes usually driven by algal biomass (particularly for Buffalo Creek) and tidal slack in the upper reaches of systems examined. 5.1.2. Total Suspended Solids Suspended solids remained low in Darwin Harbour over neap dry season conditions. Medians across all reporting zones ranged from 1.2 mg/L (Shoal Bay) through to 10.8 mg/L (Buffalo Creek). Similarly corresponding turbidity across the harbour and Shoal Bay were also low (<10 NTU) with the exception of the upper reaches of Buffalo Creek where the median value was 15.6 NTU and elevations as high as 110 NTU were recorded. 5.1.3. pH Median pH ranged from 7.5 (Blackmore Upper) to 8.1 in the outer harbour zone. This limited range was typical of dry season conditions where negligble to no flow persists with the exception of the Blackmore River. 5.1.4. Salinity Median salinities ranged from 32-36 ppt with lower salinities detected in the upper reaches of the Blackmore River and Buffalo Creek. The freshwater flows continue during the dry season in the Blackmore contributing to lower salinities. The Buffalo Creek system is subject to treated discharge from the Leanyer-Sanderson treatment plant. 5.1.5. Temperature Temperature ranged from 23C to 32C. Systems such as Elizabeth River, Blackmore River, Middle Harbour, Shoal Bay and West Arm had a narrow temperature range. Conversely systems such as Buffalo Creek, Myrmidon Creek and East Arm revealed a wider range of water temperatures. 5.1.6. Chlorophyll a Median Chlorophyll ranged from 0.2 mg/L in Shoal Bay to 10mg/L in Buffalo Creek. Extremely high concentrations were observed in Buffalo Creek particularly in upper reach sites in association with treated wastewater entering the creek. Most systems recorded very low chlorophyll-a values (<4 mg/L) with higher algal biomass generally observed in upper reach sites and tidal creeks.


Aboriginal and Torres Strait Islander people are advised that this website may contain the names, voices and images of people who have died, as well as other culturally sensitive content. Please be aware that some collection items may use outdated phrases or words which reflect the attitude of the creator at the time, and are now considered offensive.

We use temporary cookies on this site to provide functionality.
By continuing to use this site without changing your settings, you consent to our use of cookies.