Dye tracing used in effluent dispersal study in Darwin Harbour
Monitoring the dilution and movement of a tracer introduced into the water column provides an excellent means of determining the path that may be followed by a discharge and the rate at which dilution is likely to take place. Fluorescent dyes such as Rhodamine, Fluorescein or Agma are the most frequently used tracers for such investigations. CTG has been providing dye tracing systems since 1982.
Typical applications include:
- Dye tracing operations to determine water retention and flow in newly commissioned or modified oil or gas sub-sea pipelines
- Sewer and storm water drainage analysis into estuaries & seas
- Natural water flow analysis (rivers, lakes, ocean currents, cave water flows, groundwater filtration etc)
- Pollution studies
The CTG systems can be configured for a wide variety of tracers, are highly sensitive, robust, and deliver real-time data. They can be moored, profiled, towed or affixed to ROVs, gliders or AUV platforms.
Case Study: UniLux dye tracing fluorometer used in effluent dispersal study in Darwin Harbour
Internationally recognized expert and Charles Darwin University's Professor of Civil Engineering, Eric Valentine is leading a research project tracking the flow of waste from sewerage outlets as part of a modelling study for a new outfall into Darwin Harbour.
Professor Valentine chose the Chelsea UniLux fluorometer to conduct Rhodamine WT dye tracing studies in the area. Professor Valentine’s team discharged quantities of Rhodamine WT dye and a second tracer, radio-isotope, Technetium 99m into the seawater to determine where the tide carries waste water pumped into the harbour.
The UniLux fluorometer along with other sensors were attached to an aluminium frame and profiled behind a small diving boat. The boat did transects through the dye plume and measured the concentrations of the dye at a variety of GPS-mapped locations over a number of hours. Real-time information was provided directly from the UniLux to a laptop on the boat.
Ruth Patterson, Research Fellow at Charles Darwin University said, “We are very grateful to Chelsea for supplying the UniLux fluorometer at such short notice. The data will now be used to validate the hydrodynamic and water quality model and determine better waste water management in Darwin Harbour”.
Products to choose from include:
UniLux Dye Tracing Sensor CTG can offer portable systems based on the UniLux in situ fluorometer configured to measure common dyes used in such practices as Rhodamine WT or Fluorescein. The high sensitivity obtained from these sensors allows for minimum volumes and concentrations of these chemicals to be introduced to the plant.
Subsea Pipeline Leak Detection System: The system finds leaks in sub-sea pipelines by sensing the fluorescence of dyes (such as Rhodamine, Fluorescein or Agma) introduced into the pipeline.
AquaTracka III Fluorometer: The industry standard fluorometer enables real-time, highly sensitive, in-situ detection of Chlorophyll a, tracer dyes or turbidity