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Accueil du site → Doctorat → Australie → 2012 → Spatio-temporal patterns and processes of dryland salinity in south-eastern Australia

University of Sydney (2012)

Spatio-temporal patterns and processes of dryland salinity in south-eastern Australia

Haron, Michelle

Titre : Spatio-temporal patterns and processes of dryland salinity in south-eastern Australia

Auteur : Haron, Michelle

Université de soutenance : University of Sydney

Grade : Doctor of Philosophy (PhD) 2012

Résumé
Salinisation of land and water resources has been at the forefront of environmental policy in Australia for some time. Dryland salinity is one type of salinisation process, and it affects agriculture, landscape processes, biodiversity and infrastructure. Michelle’s PhD investigates the change of dryland salinity at a farming district called Baldry in central west NSW, Australia. Baldry lies within the Macquarie River Basin, which is located within the Darling section of the Murray-Darling Basin. Michelle’s PhD is part of a larger NSW government project titled "Recharge Modelling and Validation”. This larger project examines salinity processes in several priority sub-catchments throughout NSW.
The pattern of salinity change at Baldry was calculated from 1958 to 2004 by using aerial photographs and ArcGIS. Salinity patterns were also observed at smaller spatio-temporal scales through monitoring of groundwater levels, sampling of groundwater and soil, and monitoring of surface salinity patterns along transects. Salinity patterns at each scale were linked with several of six possible influencing factors : climate (for example drought episodes), groundwater, geology, topography, soil types and land use (including vegetation and remediation). A hierarchical approach was adopted to investigate whether influencing factors were linked between scales. Hierarchical studies of dryland salinity patterns and relationships with influencing factors are, to date, unique in the field of salinity research.

Mots clés : Soil salinization — Australia, Southeastern.

Présentation

Page publiée le 9 juin 2014, mise à jour le 8 juin 2017