http://ir.canterbury.ac.nz:80 The UC Research Repository digital repository system captures, stores, indexes, preserves, and distributes digital research material. Thu, 23 May 2013 00:23:37 GMT 2013-05-23T00:23:37Z http://hdl.handle.net/10092/4509 Title: Geomorphological and geophysical investigation of the effects of active tectonic deformation on the hydrogeology of North Culverden Basin, North Canterbury Authors: Armstrong, Mark James Abstract: This thesis examines the complex interaction between the tectonic evolution of Culverden Basin and the Late Quaternary sediments, which form the aquifer-bearing deposits, using geological and geomorphological mapping as well as near-surface geophysical investigations. Along the eastern margin of Culverden Basin, the deformation associated with the actively widening Australian-Pacific plate boundary zone, has resulted in the evolution of Culverden Basin and the progressive inversion of the basin floor. The eastern margin of the basin is structurally controlled by a NE trending, complexly segmented range-front fault system and associated thrust-propagated anticlines forming the basin boundary. Basin inversion is driven by the westward propagation of footwall imbricate thrusts and associated folds. The inversion of the basin floor lead to the creation of sub-basins within the larger basin, which have controlled the distribution and architecture of the Late Quaternary stratigraphy. The Late Quaternary sedimentary record documents periods of climatically induced aggradation during cold conditions and degradation in the intervening warmer times. The interaction between the sedimentation and ongoing tectonic deformation has resulted in complex lithological relationships between the locally sourced alluvial fans and the glacial outwash deposits of the major rivers entering the basin. The architecture of the aquifers is therefore controlled by the changing fluvial regime and its interaction with the evolving sub-basins. The progressive evolution of the sub-basins leads to increasing complexities in the facies relationships and to the confinement of the deposits into progressively smaller portions of the sub-basins. Once the basin boundaries become emergent, the basin becomes isolated, and potentially cut-off from its groundwater recharge source. Leonard Mound is an actively evolving imbricate thrust system along the eastern margin of Culverden Basin that has isolated the Wynyard sub-basin from the central portion of Culverden Basin, during the Late Pleistocene and present. The emergence of Leonard Mound is preventing the recharge to the Wynyard sub-basin from the high yielding aquifers of the central portion of the basin. In the central portion of Culverden Basin, high natural recharge combined with an irrigation scheme has allowed for transformation of the basin into a major dairy farming centre. In contrast, the Wynyard sub-basin is still subjected to frequent summer droughts, making it desirable to find a better source of groundwater for the eastern margin of the basin. The hydrogeological model provided by the Culverden Basin almost certainly has wider implications to the groundwater resources of other basins in similar active tectonic settings. Sat, 01 Jan 2000 00:00:00 GMT http://hdl.handle.net/10092/4509 2000-01-01T00:00:00Z http://hdl.handle.net/10092/7744 Title: Strategising towards 'inside-out' organisational change Authors: Jansen, C. Abstract: Overview • our change inquiry • frameworks for leading change • positive deviancy /outliers • diffusion of change • organisational change processes Sun, 01 Jan 2012 00:00:00 GMT http://hdl.handle.net/10092/7744 2012-01-01T00:00:00Z http://hdl.handle.net/10092/7743 Title: Travel adaptive capacity assessment for particular geographic, demographic and activity cohorts. NZ Transport Agency research report 486 Authors: Krumdieck, S.; Page, S.; Watcharasukarn, M. Abstract: Transport infrastructure and network planning must now consider oil shocks and future demand growth for more energy efficient transport modes. However, data and models for this type of fuel reduction planning are not available. Travel adaptive capacity is proposed as a measure of the resilience of travel demand to a reduction in fuel use for personal vehicle trips while not reducing participation in activities. Travel adaptive potential characterises the ways that populations can change modes to reduce fuel use without reducing participation in activities. The travel adaptive capacity assessment (TACA) survey can capture the data needed to assess adaptive capacity and the preferred mode alternatives. The survey asks for the essentiality of each trip and the alternative travel modes currently available. TACA surveys were carried out in Christchurch, Oamaru and Dunedin. Over 550 participants completed the survey in 2008–2010. The survey participant demographics, trip generation and mode data compared well with government data. The report found that for these three South Island centres, some adaptive capacity is possible, with Christchurch participants showing the greatest adaptive capacity. The TACA survey is a useful tool for further research into travel behaviour and mode choice. Sun, 01 Jan 2012 00:00:00 GMT http://hdl.handle.net/10092/7743 2012-01-01T00:00:00Z http://hdl.handle.net/10092/7742 Title: Chemical variability of groundwater samples collected from a coal seam gas exploration well, Maramarua, New Zealand Authors: Taulis, M.; Milke, M. Abstract: A pilot study has produced 31 groundwater samples from a coal seam gas (CSG) exploration well located in Maramarua, New Zealand. This paper describes sources of CSG water chemistry variations, and makes sampling and analytical recommendations to minimize these variations. The hydrochemical character of these samples is studied using factor analysis, geochemical modelling, and a sparging experiment. Factor analysis unveils carbon dioxide (CO2) degassing as the principal cause of sample variation (about 33%). Geochemical modelling corroborates these results and identifies minor precipitation of carbonate minerals with degassing. The sparging experiment confirms the effect of CO2 degassing by showing a steady rise in pH while maintaining constant alkalinity. Factor analysis correlates variations in the major ion composition (about 17%) to changes in the pumping regime and to aquifer chemistry variations due to cation exchange reactions with argillaceous minerals. An effective CSG water sampling program can be put into practice by measuring pH at the well head and alkalinity at the laboratory; these data can later be used to calculate the carbonate speciation at the time the sample was collected. In addition, TDS variations can be reduced considerably if a correct drying temperature of 180°C is consistently implemented. Tue, 01 Jan 2013 00:00:00 GMT http://hdl.handle.net/10092/7742 2013-01-01T00:00:00Z