Scallop dredging and sedimentation in Port Phillip Bay / Peter R. Greilach, Mark Rosenberg, Kerry P. Black, Greg D. Parry, Michael Forsyth.

Includes appendices.

Includes bibliographical references (page 46 of Volume 1, and page 22 of Volume 2).

Volume 1: Sediment and hydrodynamic measurements: field data collection and analysis / Mark Rosenberg, Kerry Black, Greg Parry ; Volume 2 : Sediment analysis / Peter R. Greilach, Kerry P. Black, Greg D. Parry, Michael Forsyth.

VOLUME 1 CONTENTS: Abstract -- 1. Introduction -- 2. Description of study region -- 3. Relevant related data and studies -- 4. Measurements and instrumentation -- 4.1 Sediment transport unit -- 4.2 Calibration of OBS sensors -- 4.3 Current meters and tide gauges -- 4.4 Sediment trap experiments -- 5. Data from the field experiments -- 5.1 Suspended sediment concentrations -- 5.2 Underwater video footage -- 5.3 Pumped sediment samples -- 5.4 Current meter data -- 5.5 Tide gauge data -- 5.6 Tidal analyses -- 5.7 Data files -- 5.8 Sediment trap data -- 5.9 Additional data -- 6. Instrument deployments -- 6.1 Sediment transport unit -- 6.2 Current meter/tide gauge moorings -- 6.3 Sediment traps -- 7. Retrieval success and data quality -- 7.1 Errors in positioning -- 7.2 Equipment condition/position on recovery -- 7.3 Irretrievably lost data -- 7.4 Recovered data -- 7.5 Interference in suspended sediment records -- 8. Data analysis -- 9. Meteorological data -- 10. Graphical output -- 10.1 Graphs of suspended sediment concentration data -- 10.2 Graphs of current data -- 10.3 Graphs of standard deviations from S4 burst measurements -- 10.4 Graphs of sea level data -- 10.5 Graphs of wind data -- 10.6 Graphs of barometric pressure and rainfall data -- 11. Comparison of underwater video footage with OBS measurements -- 12. Comparison of pumped concentrations with OBS measurements -- 13. Data observations-- 14. Acknowledgements -- 15. References -- Appendix 1: Description and examples of suspended sediment, current meter, tide gauge, and meteorological files -- Suspended sediment probe files -- Standard sediment files -- Average sediment files -- Current meter files -- Standard S4 current meter files -- S4 complete current meter files -- Neil Brown current meter files -- Tide gauge files -- Meteorological data -- Wind data files -- Barometric pressure and rainfall -- Files containing measured, predicted and residual values (MPR files) -- MPR files for currents -- MPR files for sea levels -- Summary of filenames and contents -- Appendix 2: Graphical output of data -- Appendix 3: Tables of tidal constituents from tidal current and height analyses -- Appendix 4: Observations from video recordings -- Appendix 5: Results from sediment trap experiments -- Appendix 6: Sled sampling and trawling information.

VOLUME 2 CONTENTS: 1. Introduction -- 1.1 Background -- 1.2 Description of the study region -- 2. Methodology -- 2.1 Sediment monitoring sled -- 2.2 Fall velocity and equivalent grain size -- 2.3 Determination of pump concentrations -- 2.4 Sediment traps -- 3. Results -- 3.1 Dromana sled sediments -- 3.2 Portarlington sled sediments -- 3.3 St Leonards sled sediments -- 3.4 Sediment concentrations in pumped samples -- 3.5 Sediment traps -- 4. Conclusion -- 5. Bibliography -- Appendix 1: Description of the grain size analysis techniques -- A1.1 Automated settling tube analysis -- A1.2 Pipette analysis -- A1.3 Merging of results from the settling tube and pipette analyses -- Appendix 2: Class definitions and statistical formulae -- A2.1 The phi size scale -- A2.2 Statistical description of sediments -- Appendix 3: Grain size analysis results from the sled trials -- A3.1 Dromana -- A3.2 Portarlington -- A3.3 St Leonards -- Appendix 4: Grain size analysis results from the sediment traps -- A4.1 Portarlington -- A4.2 St Leonards.

A project was undertaken to assess the effects of commercial scallop dredging practices in Port Phillip Bay, Victoria, on sediment disturbance and catch efficiency. In situ sediment transport and current measurements were made at various locations around the bay. Sediment transport was measured both under natural conditions, and during dredging trials by commercial scallop-fishing boats in the locality of the instruments. A unit was deployed which contained a video camera for observations of bed suspended sediment concentrations. Current meters and suspended sediment traps were deployed simultaneously near the sediment transport unit, and at some additional sites. Grain size analyses were performed on samples collected by the sediment traps. As part of the overall field program, additional biota related measurements were taken, including benthic grab and benthic sled samples, and trawl samples. The reduced data and data collection methods relevant to sediment transport and current measurements are presented in this report.

GRETA POINT: 551.35:627.74(945) GRE Vol. 1-2