This dataset consists of 1 excel data files (.xlsx format) that contains the results from the in situ deployment of instruments
in Cleveland Bay to measure sediment deposition from a trailer suction hopper dredge working in Platypus channel. The aim
of the study was to measure sediment deposition rates caused by a working Trailer Suction Hopper dredge in Platypus channel
in Cleveland Bay.
Two deposition sensors were deployed on the seabed 100 m (-19.226083° 146.843500°) away from the edge of the Platypus channel
in Cleveland Bay near marker beacon P11 at a depth of 5–8 m. Single deposition sensors were also placed on a transect
line running at right angles from the shipping channel at distance of 200 m (19.225639° 146.842889°), 400 m (-19.224528°
146.841111), and 800 m (-19.222806° 146.837889°). The deposition sensors were calibrated according to methods described in
Ridd et al. (2001), Thomas et al. (2003), Whinney et al. (2017).
The deposition sensor uses infrared optical backscatters techniques to estimate the mass of sediment per unit area that
deposits on the sensor surface every 10– 20 minutes. After 1 h the surface is wiped clean and the process repeated.
Additional instruments were deployed alongside the sensors including a nephelometer measuring turbidity by means of optical
backscatter, a pressure sensor for estimating wave activity, and a tilt current meter for estimating current speed. For
instrument descriptions and calibration details see Macdonald et al. (2013), Marchant et al. (2014), Whinney et al. (2017).
Limitation of the data:
All data went through a quality assurance process involving an algorithm to remove occasional data spikes. This algorithm
compares each reading to the average of the readings directly before and after it, and if the reading is greater than twice
the average it is replaced by the average. Fouling of sensors was examined by looking for drift in values over the deployment
period and from observations of the condition of the sensors at the time of retrieval. Data that have been affected by fouling
This data is in a single Excel file
Site 1A - 100m from Channel
Site 1B - 100m from Channel
Site 2 – 200 m from Channel
Site 3 – 400 m from Channel
Site 4 – 800 m from Channel
Columns B – F : hourly sensor readings of sediment deposition as mg/cm2/day
per 10 minute intervals:
Column I: 2 – NTU (Nephelometric turbidity unit) at Site 2 – 200 m from Channel
Column J: m (metres, water depth) at Site 4 - 800 m from the Channel
Column K: m/s (metres per second) current sensor readings at Site 4 - 800 m from the Channel
Graphs of the data can be found in the Report in figures 16 B, 16 C, and 16 D: Ross Jones, Rebecca Fisher, David Francis,
Wojciech Klonowski, Heidi Luter, Andrew Negri, Mari-Carmen Pineda, Gerard Ricardo, Matt Slivkoff James Whinney. Risk Assessing
Dredging activities. Report to the National Environmental Science Program. Reef and Rainforest Research Centre Limited,
Cairns (74 pp).
Macdonald R, Ridd P, Whinney J, Larcombe P, Neil D (2013) Towards environmental management of water turbidity within open
coastal waters of the Great Barrier Reef. Mar Pollut Bull 74:82-94
Marchant R, Stevens T, Choukroun S, Coombes G, Santarossa M, Whinney J, Ridd P (2014) A Buoyant Tethered Sphere for Marine
Current Estimation. IEEE Journal of Oceanic Engineering 39:2-9
Ridd P, Day G, Thomas S, Harradence J, Fox D, Bunt J, Renagi O, Jago C (2001) Measurement of Sediment Deposition Rates using
an Optical Backscatter Sensor. Estuar Coast Shelf Sci 52:155-163
Thomas S, Ridd PV, Day G (2003) Turbidity regimes over fringing coral reefs near a mining site at Lihir Island, Papua New
Guinea. Mar Pollut Bull 46:1006-1014
Whinney J, Jones R, Duckworth A, Ridd P (2017) Continuous in situ monitoring of sediment deposition in shallow benthic environments.
Coral Reefs 36:521–533
Ross Jones, Rebecca Fisher, David Francis, Wojciech Klonowski, Heidi Luter, Andrew Negri, Mari-Carmen Pineda, Gerard Ricardo,
Matt Slivkoff James Whinney. Risk Assessing Dredging activities. Report to the National Environmental Science Program. Reef
and Rainforest Research Centre Limited, Cairns (74 pp).
This dataset is filed in the eAtlas enduring data repository at: data\nesp2\2.1.9-dredging-marine-response