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Eriss Research Summary 2004–2005

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Eriss Research Summary 2004–2005 supervising scientist report 189 eriss research summary 2004–2005 KG Evans, J Rovis-Hermann, A Webb & DR Jones (editors) It is SSD policy for reports in the SSR series to be reviewed as part of the publications process. This SSR is a summary of the 2004–05 research program of the Environmental Research Institute of the Supervising Scientist and has been reviewed internally by senior staff and the editors of the volume. Kenneth G Evans – Environmental Research Institute of the Supervising Scientist, GPO Box 461, Darwin NT 0801, Australia. Jacqui Rovis-Hermann – Office of the Supervising Scientist, GPO Box 461, Darwin NT 0801, Australia. (Current address: Department of Employment & Workplace Relations, 11th Floor, QV1 Building, 250 St George's Terrace, Perth WA 6000, Australia) Ann L Webb – Office of the Supervising Scientist, GPO Box 461, Darwin NT 0801, Australia. David R Jones – Environmental Research Institute of the Supervising Scientist, GPO Box 461, Darwin NT 0801, Australia. This report should be cited as follows: Evans KG, Rovis-Hermann J, Webb A & Jones DR (eds) 2006. eriss research summary 2004–2005. Supervising Scientist Report 189, Supervising Scientist, Darwin NT. The Supervising Scientist is part of the Australian Government Department of the Environment and Heritage. © Commonwealth of Australia 2006 Supervising Scientist Department of the Environment and Heritage GPO Box 461, Darwin NT 0801 Australia ISSN 1325-1554 ISBN 0 642 24397 2 This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without prior written permission from the Supervising Scientist. Requests and inquiries concerning reproduction and rights should be addressed to Publications Inquiries, Supervising Scientist, GPO Box 461, Darwin NT 0801. e-mail: [email protected] Internet: www.deh.gov.au/ssd (www.deh.gov.au/ssd/publications) The views and opinions expressed in this report do not necessarily reflect those of the Commonwealth of Australia. While reasonable efforts have been made to ensure that the contents of this report are factually correct, some essential data rely on the references cited and the Supervising Scientist and the Commonwealth of Australia do not accept responsibility for the accuracy, currency or completeness of the contents of this report, and shall not be liable for any loss or damage that may be occasioned directly or indirectly through the use of, or reliance on, the report. Readers should exercise their own skill and judgment with respect to their use of the material contained in this report. Printed and bound in Darwin by uniprint NT Contents Preface ix PART 1: RANGER – CURRENT OPERATIONS 1 Development of a contaminant pathways conceptual model for Ranger mine 5 R van Dam & P Bayliss Preliminary assessment of bioaccumulation and trophic transfer of key metals from Ranger mine 9 R van Dam, C Sauerland, K Turner, C Humphrey, B Ryan & A Bollhöfer Influence of calcium on the ecotoxicity of magnesium: Implications for water quality trigger values 15 R van Dam, A Hogan, C McCullough, C Humphrey, S Nou & M Douglas Chronic toxicity of uranium to the tropical duckweed, Lemna aequinoctialis 20 R van Dam, S Nou & A Hogan Development of a reference toxicity testing program for Chlorella sp. and Hydra viridissima 24 A Hogan, R van Dam & S Nou Revision of the ecotoxicology laboratory manual 27 A Hogan Atmospheric radiological monitoring in the vicinity of Ranger and Jabiluka 28 A Bollhöfer, D Elphick & SA Atkins Monitoring of radionuclides in groundwater at Ranger 31 B Ryan Radon concentrations in air in the Alligator Rivers Region 32 A Bollhöfer & P Martin Introduction to SSD’s stream monitoring program for Ranger, 2004–05 35 C Humphrey iii Chemical and physical monitoring of surface waters in Magela and Gulungul Creeks 36 M Iles Creekside monitoring in Magela Creek 40 C Humphrey, D Buckle & R Luxon Monitoring using macroinvertebrate community structure 43 C Humphrey, J Hanley, C Camilleri & A Cameron Monitoring using fish community structure 46 R Pidgeon & C Humphrey Fish communities in channel billabongs 48 C Humphrey, D Buckle & R Pidgeon Fish communities in shallow lowland billabongs 54 R Pidgeon, R Luxon & D Buckle Publication of protocols for SSD’s stream monitoring program in Magela Creek and Quality Control and Quality Assurance of SSD’s stream monitoring program 58 C Humphrey Review of the bioaccumulation monitoring program 60 C Sauerland, B Ryan, C Humphrey & D Jones Surface water radiological monitoring in the vicinity of Ranger and Jabiluka 63 C Sauerland, P Medley & J Sellwood Surface water transport of uranium in the Gulungul catchment 67 C Sauerland, K Mellor, D Parry & A Bollhöfer PART 2: RANGER – REHABILITATION 71 Reliability assessment of Siberia model outputs 75 KG Evans & GR Willgoose iv Assessing the geomorphic stability of the currently proposed final landform at the Ranger mine using landform evolution modelling 77 JBC Lowry & KG Evans Radio- and lead isotopes in sediments of the Alligator Rivers Region 80 A Bollhöfer & A Frostick Radon exhalation at and around Ranger uranium mine 83 C Lawrence, R Akber, P Martin & A Bollhöfer Development of predictive habitat suitability models of vegetation communities associated with the rehabilitated Ranger final landform 86 C Humphrey, I Hollingsworth & G Fox Key aspects of native flora seed biology that support Ranger mine rehabilitation goals 99 P Bayliss & S Bellairs Key aspects of native flora seed biology that support Ranger mine rehabilitation goals. Part 1: Seed biology of selected Australian native grass species 100 K Sangster & S Bellairs Key aspects of native flora seed biology that support Ranger mine rehabilitation goals. Part 2: Progress on Kakadu Native Plant Supplies Project 103 M Gardener, P Christophersen & S McGregor Bioaccumulation in traditional Aboriginal bushfoods 106 B Ryan, A Bollhöfer & P Martin Assess Quickbird data for weed mapping and monitoring at Ranger 110 K Pfitzner Quantify stream sediment transport characteristics for Gulungul Creek to assess the impact of mine site erosion and rehabilitation performance of Ranger mine 112 DR Moliere, MJ Saynor & KG Evans v Feasibility study of implementation of sediment monitoring system in Corridor and Magela creeks upstream and downstream of Ranger mine 116 DR Moliere & MJ Saynor PART 3: JABILUKA 117 Monitoring during the care and maintenance phase at Jabiluka 120 M Iles Monitoring suspended sediment at Jabiluka 1998–2003: establishing baseline 123 KG Evans, DR Moliere, MJ Saynor, WD Erskine & MG Bellio Monitoring suspended sediment at Jabiluka: 2003–2005 127 DR Moliere, MJ Saynor & KG Evans Baseline stream channel stability characteristics in the Ngarradj catchment 130 MJ Saynor, WD Erskine, DR Moliere & KG Evans Gully initiation near the Jabiluka project area 134 MJ Saynor, WD Erskine, KG Evans & I Eliot Scour and fill in the Ngarradj catchment between 1998 and 2003 139 MJ Saynor, WD Erskine & KG Evans Cross-sectional changes in the Ngarradj catchment between 1998 and 2003 143 MJ Saynor, WD Erskine & KG Evans PART 4: NABARLEK 147 Vegetation monitoring techniques at Nabarlek mine site using remote sensing and ground-based studies 150 K Pfitzner Assess a variety of spatial, spectral and temporal scaled remotely sensed data for rehabilitation assessment 153 K Pfitzner vi Sediment and radionuclide fluxes from the former Nabarlek mine 157 GR Hancock, MK Grabham, P Martin, KG Evans & A Bollhöfer Assessing the geomorphic stability of the rehabilitated Nabarlek mine using landform evolution modelling 160 JBC Lowry, DR Moliere, GS Boggs & KG Evans Radiological impact assessment of the rehabilitated Nabarlek site 163 A Bollhöfer, B Ryan, P Martin & K Pfitzner PART 5: GENERAL ALLIGATOR RIVERS REGION 167 Mangrove response to environmental change, especially climate change 170 K Pfitzner Ecological risk assessment of Magela floodplain to differentiate mining and non-mining impacts 172 P Bayliss, R van Dam, J Boyden & D Walden Significant habitats and species in the Alligator Rivers Region 186 C Humphrey Radiological case study: South Alligator River 188 B Ryan, P Martin, A Bollhöfer & K Pfitzner RESEARCH CONSULTANCIES 191 Australia’s tropical rivers – an integrated data assessment and analysis 192 R van Dam A preliminary ecological risk assessment of the impact of Ginger ants (Solenopsis geminata) on colonies of seabirds at Ashmore Reef 193 P Bayliss Climate change vulnerability of wetlands 194 I Eliot, MJ Saynor, K Pfitzner & M Eliot vii Appendix 1 SSD publications for 2004–05 195 Appendix 2 ARRTC Key Knowledge Needs 2004–2005 203 viii Preface The Environmental Research Institute of the Supervising Scientist (eriss) is part of the Supervising Scientist Division of the Commonwealth Department of Environment and Heritage. Its primary role is to undertake monitoring of and research into the impact of uranium mining activities in the Alligators Rivers region to protect human and ecosystem health, and to provide advice to the Supervising Scientsist. eriss also conducts research on tropical river systems and the ecology and conservation of tropical wetlands with a focus on the sustainable use of water resources. This report contains summaries of research projects undertaken by eriss over the 2004–05 financial year. For additional information, readers are referred to the annual publications list (Appendix 1) which details all of the material published, and conference and workshop papers presented by eriss staff in 2004–05. The balance and strategic prioritisation of work within the uranium component of eriss’s project portfolio is defined by Key Knowledge Needs (KKNs) developed by consultation between the Alligator Rivers Region Technical Committee (ARRTC), the Supervising Scientist, Energy Resources of Australia and other stakeholders. Six thematic areas (based primarily on geographic provenance) have been identified as being the primary KKN’s topic areas to ensure the current and future protection of the environment of the Alligator Rivers Region (Appendix 2). The content of the research program developed for each of these areas is assessed and reviewed annually by ARRTC in consultation with stakeholder groups.
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