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Persistent Waterhole 200m-Segment data for NAWRA
Persistent waterholes provide important refuge habitats. Waterhole persistence data shows the percentage of years where surface water has been identified along the stream channels during the driest period of the dry seasons from 1988 to 2015 and is derived from Landsat imagery. This dataset was created for the CSIRO Northern Australia Water Resourc... moree Assessment (NAWRA) project. This dataset uses another dataset (also available on the Data Access Portal titled ‘Persistent waterholes derived from Landsat archive for NAWRA’), where waterholes were mapped at the end of each dry season (based on available cloud-free Landsat scenes) using a Normalised Difference Water Index derived from Landsat imagery. This method is described in Sims et al. (2016) and only looks at the persistence of water within each pixel through time.
This dataset allows for the fact that a waterhole can vary in shape and local location through time, by providing the percentage of years that at least one water pixel is identified within along-stream segments at the end of each dry season.
Further information is provided as a supported attachment.
Fitzroy catchment (Western Australia)
Darwin catchments (Northern Territory)
Mitchell catchment (Queensland)
The end-of-dry-season waterhole images from 1988 to 2015 were used along with an in-channel mask containing a 500m buffer from the watercourse which was divided into 200m segments along each streamline. This was done in ArcGIS where point locations at 200m intervals were extracted from the river lines (XTools Pro-> Feature Conversions->Convert Features to Points, fixed interval = 200m). These points were used to create Theissen polygons (ArcTools->Analysis Tools->Proximity-> Create Theissen Polygons) which in turn were clipped to a 500m buffer either side of the river line.
The percentage of end-of-dry-seasons containing at least one pixel (30m x 30m) of water within each 200m segment was calculated. Permanent dams were masked out of the images.
The Australian Government commissioned CSIRO to complete the Northern Australia Water Resource Assessment (NAWRA) - an initiative of the Australian Government’s White Paper on Developing Northern Australia and the Agricultural Competitiveness White Paper, the government’s plan for stronger farmers and a stronger economy. Aspects of the Assessment were undertaken in conjunction with the Northern Territory Government, the Western Australian Government, and the Queensland Government.
Creative Commons Attribution 4.0 International Licence
Ticehurst, Catherine; Marvanek, Steve (2018): Persistent Waterhole 200m-Segment data for NAWRA. v1. CSIRO. Data Collection.
All Rights (including copyright) CSIRO 2018.
The metadata and files (if any) are available to the public.
Northern Australian Basin Assessment:: Water Resource Assessments
This metadata record relates specifically to the stated body of work and was created for the Northern Australia Water Resource Assessment (NAWRA) project. The NAWRA project has undertaken a comprehensive and integrated evaluation of the feasibility, economic viability and sustainability of water resource development in three priority areas in north... moreern Australia: the Fitzroy catchment (WA), the Darwin catchments and the Mitchell catchment (Qld).
Functionally, NAWRA implemented an activities-based approach with the following activity groups: climate, land suitability, surface water hydrology, groundwater hydrology, agriculture and aquaculture viability, water storage, socio-economics, Indigenous water values, rights and development aspirations, and aquatic and marine ecology contributing to the results.
The Assessment examined resource use unconstrained by legislation or regulations, and examined the monetary and non-monetary values associated with existing use of those resources, to enable a wide range of stakeholders to assess for themselves the costs and benefits of given courses of action. NAWRA is fundamentally a resource evaluation. This project did not seek to advocate irrigation development or assess or enable any particular development; rather it identified the resources that could be deployed in support of potential irrigation enterprises, evaluated the feasibility of development (at a catchment scale, not for individual paddocks or businesses) and considered the scale of the opportunities that might exist to support deliberation and decisions concerning sustainable regional development. less
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