title: Paleoliquefaction in Late Pleistocene alluvial sediments in Hauraki and Hamilton basins, and implications for paleoseismicity

authors: Kleyburg, Melissa Anita

abstract: Liquefaction susceptibility of the Late Pleistocene Hinuera Formation is of interest to the engineering community as it is unclear whether materials of this age will still be prone to activation by cyclic stresses. In this paper we report on rare paleoliquefaction features in the form of injection structures that we have identified at two sites near Hamilton. These structures are clearly earthquake induced, and indicate the potential for future liquefaction episodes. However, we suggest that the hazard is restricted to areas with impeded drainage that imparts a high water table. Such areas are localised, and may be recognised from the modern (pedological) soil distribution. Evaluating piezocone penetration test (CPTu) data from the sites of known paleoliquefaction indicates that the CPTu gives a meaningful indication of liquefaction potential, and questions the validity of applying aging factors to these deposits.

text: Paleoliquefaction in Late Pleistocene alluvial sediments in Hauraki and Hamilton basins, and implications for paleoseismicity Liquefaction susceptibility of the Late Pleistocene Hinuera Formation is of interest to the engineering community as it is unclear whether materials of this age will still be prone to activation by cyclic stresses. In this paper we report on rare paleoliquefaction features in the form of injection structures that we have identified at two sites near Hamilton. These structures are clearly earthquake induced, and indicate the potential for future liquefaction episodes. However, we suggest that the hazard is restricted to areas with impeded drainage that imparts a high water table. Such areas are localised, and may be recognised from the modern (pedological) soil distribution. Evaluating piezocone penetration test (CPTu) data from the sites of known paleoliquefaction indicates that the CPTu gives a meaningful indication of liquefaction potential, and questions the validity of applying aging factors to these deposits.

year: 2015-02-22

title: Discursive dissonance: Critical reflexivity for counselling supervision

authors: Esler, Ireni

subjects: supervision

abstract: When practitioners and supervisors do not share the same counselling language or theoretical orientation, how is shared meaning achieved and relational connection sustained in supervision? How are differences in theoretical orientation negotiated in supervision in ways that open space for collaborative, generative dialogue and critical reflection on the politics of practice? In response to these questions, this thesis presents a critical, reflexive practitioner-inquiry exploring the possibilities and limitations a social constructionist and narrative approach to supervision makes possible for students learning apolitical, humanistic approaches to counselling. Positioned in theoretical landscapes of social constructionism, feminist poststructuralism and Narrative Therapy, this study is a reflection-in-action of a supervisor’s practice. Central to the study’s argument is discursive positioning theory; the associated concepts of relational identity, authorship and agency; and the self as a storying subject. Two student counsellors and two newly qualified counsellors, whose practice was shaped by structuralist, humanistic theories, and who were already engaged in supervision, participated in the study. Employing narrative practices of co-inquiry to generate data, a series of supervision sessions were recorded, reviewed individually by supervisor and practitioner/participant and later discussed in reflective/research meetings. Using a critically reflexive approach to discourse analysis, selected data-texts were explored for moments of discursive dissonance and moments of movement in practice development and professional identity. Research findings highlighted the need for explicit supervision working agreements, theoretical transparency, and encouragement by counsellor training/education providers for students to make fuller use of supervision as a critical learning space. It identifies three processes that might inform supervision when theoretical orientations are non-aligned. These are: supervision as critical reflexivity, supervision as a socio-political conversation, and supervision as a storying practice.

text: Discursive dissonance: Critical reflexivity for counselling supervision When practitioners and supervisors do not share the same counselling language or theoretical orientation, how is shared meaning achieved and relational connection sustained in supervision? How are differences in theoretical orientation negotiated in supervision in ways that open space for collaborative, generative dialogue and critical reflection on the politics of practice? In response to these questions, this thesis presents a critical, reflexive practitioner-inquiry exploring the possibilities and limitations a social constructionist and narrative approach to supervision makes possible for students learning apolitical, humanistic approaches to counselling. Positioned in theoretical landscapes of social constructionism, feminist poststructuralism and Narrative Therapy, this study is a reflection-in-action of a supervisor’s practice. Central to the study’s argument is discursive positioning theory; the associated concepts of relational identity, authorship and agency; and the self as a storying subject. Two student counsellors and two newly qualified counsellors, whose practice was shaped by structuralist, humanistic theories, and who were already engaged in supervision, participated in the study. Employing narrative practices of co-inquiry to generate data, a series of supervision sessions were recorded, reviewed individually by supervisor and practitioner/participant and later discussed in reflective/research meetings. Using a critically reflexive approach to discourse analysis, selected data-texts were explored for moments of discursive dissonance and moments of movement in practice development and professional identity. Research findings highlighted the need for explicit supervision working agreements, theoretical transparency, and encouragement by counsellor training/education providers for students to make fuller use of supervision as a critical learning space. It identifies three processes that might inform supervision when theoretical orientations are non-aligned. These are: supervision as critical reflexivity, supervision as a socio-political conversation, and supervision as a storying practice.

year: 2011

title: The use of functionalised biochar to enhance phosphorus removal in woodchip bioreactors. The integration of mātauranga Māori to enhance the cultural aspects of woodchip bioreactors.

authors: Taoho, Brandon

subjects: Woodchip bioreactor

abstract: Nutrient pollution, resulting from excessive releases of nitrogen (N) and phosphorus (P) into waterways, poses a significant threat to aquatic ecosystems worldwide. Elevated nutrient levels can result in eutrophication, which can have detrimental effects on the health of waterbodies and their biota. Woodchip bioreactors are effective, edge-of-field technologies that can help mitigate nutrient pollution by lowering nutrient concentrations in agricultural drainage systems known to carry leached N and P into waterways. However, one limitation to their design is their ineffectiveness at removing P. The inclusion of functionalised biochar is one potential solution to enhance P removal in woodchip bioreactors. There is a growing need to mitigate nutrient pollution in New Zealand that does not depend on a western-centric perspective only. Integration of mātauranga Māori and western science into the design and operations of a woodchip bioreactor is one approach to incorporate both knowledge systems to the goal of mitigating nutrient pollution. In this dissertation, a column experiment was used to compare the P removal efficiencies of two treatments of functionalised biochar, and one treatment of woodchips when subjected to stream water spiked with P. Subsequently, a single phosphate extraction was done to determine the phosphate absorption capacities of each treatment. The results showed that the two functionalised biochar treatments had the highest efficacy in reducing P concentrations in the P-spiked stream water compared to the woodchip-only treatment. Both treatments also showed higher P absorption, evidenced from the Fe-P/Feox ratio, within the phosphate extraction experiment. A wānanga was organised at Matahuru Marae, Lake Waikare, to share mātauranga Māori on how to culturally enhance woodchip bioreactors from a Te Ao Māori perspective. Participants recommended that native woodchips be incorporated into woodchip bioreactors because of their inherent association to the land and people. Overall, the results implied that functionalised biochar is an effective solution to enhance P removal in woodchip bioreactors due to their biophysical properties to absorb and retain P. Secondly, incorporating native woodchips into woodchip bioreactors systems potentially offers a sustainable and culturally respected alternative to conventional wood chips, aligning with Māori values and tikanga

text: The use of functionalised biochar to enhance phosphorus removal in woodchip bioreactors. The integration of mātauranga Māori to enhance the cultural aspects of woodchip bioreactors. Nutrient pollution, resulting from excessive releases of nitrogen (N) and phosphorus (P) into waterways, poses a significant threat to aquatic ecosystems worldwide. Elevated nutrient levels can result in eutrophication, which can have detrimental effects on the health of waterbodies and their biota. Woodchip bioreactors are effective, edge-of-field technologies that can help mitigate nutrient pollution by lowering nutrient concentrations in agricultural drainage systems known to carry leached N and P into waterways. However, one limitation to their design is their ineffectiveness at removing P. The inclusion of functionalised biochar is one potential solution to enhance P removal in woodchip bioreactors. There is a growing need to mitigate nutrient pollution in New Zealand that does not depend on a western-centric perspective only. Integration of mātauranga Māori and western science into the design and operations of a woodchip bioreactor is one approach to incorporate both knowledge systems to the goal of mitigating nutrient pollution. In this dissertation, a column experiment was used to compare the P removal efficiencies of two treatments of functionalised biochar, and one treatment of woodchips when subjected to stream water spiked with P. Subsequently, a single phosphate extraction was done to determine the phosphate absorption capacities of each treatment. The results showed that the two functionalised biochar treatments had the highest efficacy in reducing P concentrations in the P-spiked stream water compared to the woodchip-only treatment. Both treatments also showed higher P absorption, evidenced from the Fe-P/Feox ratio, within the phosphate extraction experiment. A wānanga was organised at Matahuru Marae, Lake Waikare, to share mātauranga Māori on how to culturally enhance woodchip bioreactors from a Te Ao Māori perspective. Participants recommended that native woodchips be incorporated into woodchip bioreactors because of their inherent association to the land and people. Overall, the results implied that functionalised biochar is an effective solution to enhance P removal in woodchip bioreactors due to their biophysical properties to absorb and retain P. Secondly, incorporating native woodchips into woodchip bioreactors systems potentially offers a sustainable and culturally respected alternative to conventional wood chips, aligning with Māori values and tikanga

year: 2023