ORCID Profile
0000-0003-3049-4622
Current Organisations
Geoscience Australia
,
James Cook University
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Publisher: American Geophysical Union (AGU)
Date: 02-2013
DOI: 10.1002/WRCR.20117
Publisher: Elsevier BV
Date: 06-2018
Publisher: Geological Society of London
Date: 07-2015
Publisher: Geoscience Australia
Date: 2011
Publisher: Elsevier BV
Date: 08-2006
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/MF16316
Abstract: High turbidity in reservoirs may negatively affect aquatic ecology and water infrastructure. Although many reservoirs are turbid, the origin and intra- and interannual variability of turbidity is not well understood. To examine the cause and variability of turbidity, we measured the concentration, particle size, organic content and mineralogy of suspended and benthic sediment s les from Lake Dalrymple, a large reservoir in northern dry tropical Queensland. S les were collected during the dry season (May–November) in 2004, 2005, 2006 and 2011. Water in the reservoir is turbid ( nephelometric turbidity units (NTU)) throughout the year, predominantly due to colloidal particles ( .9μm) composed of clay and mica minerals. Benthic sediments range from 1 to 30μm in size, suggesting that resuspension of lake bottom sediments has little effect on turbidity. Dry season turbidity levels are strongly affected by the magnitude and duration of inflow waters from the preceding wet season, reflecting the limited availability of suspended particles delivered from the upstream catchment. Elevated turbidity in the reservoir and downstream irrigation areas during the dry season is now a common feature and must be incorporated into all agricultural and wetland management plans.
Publisher: Geoscience Australia
Date: 2014
Publisher: CSIRO Publishing
Date: 2011
DOI: 10.1071/SR10121
Abstract: The pH is one of the fundamental soil properties governing nutrient availability, metal mobility, elemental toxicity, microbial activity, and plant growth. The field pH of topsoil (0–0.10 m depth) and subsoil (~0.60–0.80 m depth) was measured on floodplain soils collected near the outlet of 1186 catchments covering Mkm2 (6 × 1012 m2) or ~80% of Australia. Field pH duplicate data, obtained at 124 randomly selected sites, indicate a precision of 0.5 pH unit (or 7%), and mapped pH patterns are consistent and meaningful. The median topsoil pH is 6.5, while the subsoil pH has a median of 7 but is strongly bimodal (6–6.5 and 8–8.5). In most cases (64%) the topsoil and subsoil pH values are similar among the sites exhibiting a pH contrast, those with more acidic topsoils are more common (28%) than those with more alkaline topsoils (7%). The distribution of soil pH at the national scale indicates the strong controls exerted by precipitation and ensuing leaching (e.g. low pH along the coastal fringe, high pH in the dry centre), aridity (e.g. high pH where calcrete is common in the regolith), vegetation (e.g. low pH reflecting abundant soil organic matter), and subsurface lithology (e.g. high pH over limestone bedrock). The new data, together with existing soil pH datasets, can support regional-scale decision-making relating to agricultural, environmental, infrastructural, and mineral exploration decisions.
No related grants have been discovered for Michelle Cooper.