title: Lagrangian measurements of turbulent dissipation over a shallow tidal ﬂat from pulse coherent Acoustic Doppler Profilers

authors: Mullarney, Julia C.

subjects: drifters

abstract: We present high resolution (25 mm spatial, 8 Hz temporal) profiles of velocity measured over a shallow tidal flat using pulse-coherent Acoustic Doppler Profilers mounted on surface drifters. The use of Lagrangian measurements mitigated the problem of resolving velocity ambiguities, a problem which often limits the application of high-resolution pulse-coherent profilers. Turbulent dissipation rates were estimated from second-order structure functions of measured velocity. Drifters were advected towards, and subsequently trapped on, a convergent surface front which marked the edge of a freshwater plume. Measured dissipation rates increased as a drifter deployed within the plume approached the front. A drifter then propagated with and along the front as the fresh plume spread across the tidal flats. Near-surface turbulent dissipation measured at the front roughly matched a theoretical mean-shear-cubed relationship, whereas dissipation measured in the stratified plume behind the front was suppressed. After removal of estimates affected by surface waves, near-bed dissipation matched the velocity cubed relationship, although scatter was substantial. Dissipation rates appeared to be enhanced when the drifter propagated across small subtidal channels.

text: Lagrangian measurements of turbulent dissipation over a shallow tidal ﬂat from pulse coherent Acoustic Doppler Profilers We present high resolution (25 mm spatial, 8 Hz temporal) profiles of velocity measured over a shallow tidal flat using pulse-coherent Acoustic Doppler Profilers mounted on surface drifters. The use of Lagrangian measurements mitigated the problem of resolving velocity ambiguities, a problem which often limits the application of high-resolution pulse-coherent profilers. Turbulent dissipation rates were estimated from second-order structure functions of measured velocity. Drifters were advected towards, and subsequently trapped on, a convergent surface front which marked the edge of a freshwater plume. Measured dissipation rates increased as a drifter deployed within the plume approached the front. A drifter then propagated with and along the front as the fresh plume spread across the tidal flats. Near-surface turbulent dissipation measured at the front roughly matched a theoretical mean-shear-cubed relationship, whereas dissipation measured in the stratified plume behind the front was suppressed. After removal of estimates affected by surface waves, near-bed dissipation matched the velocity cubed relationship, although scatter was substantial. Dissipation rates appeared to be enhanced when the drifter propagated across small subtidal channels.

year: 2012

title: Exploring children’s perspectives: Multiple ways of seeing and knowing the child

authors: Peters, Sally

subjects: Young children

abstract: This article focuses on human development in the early years, and the challenges for teachers and researchers in seeking to explore young children’s perspectives. The current interest in listening to children’s voices sits within competing developmental discourses about infants, toddlers and young children, which emphasise both their capability and confidence as well as their immaturity, especially with regard to oral language. Their “voice” can be heard and seen differently by teachers, researchers and families, who filter it according to their own perspectives and their image of the child. Drawing on a range of contemporary New Zealand studies, we discuss some key issues such as whether children need speech to have a voice? And in what ways can we gather children’s perspectives in research and education? To explore children’s perspectives and hear their voices requires skilled and flexible researchers and teachers, who watch and listen carefully whilst being mindful of their filtering/interpretive gazes. This takes time and patience and requires multiple ways of gathering data in order that the child is heard authentically.

text: Exploring children’s perspectives: Multiple ways of seeing and knowing the child This article focuses on human development in the early years, and the challenges for teachers and researchers in seeking to explore young children’s perspectives. The current interest in listening to children’s voices sits within competing developmental discourses about infants, toddlers and young children, which emphasise both their capability and confidence as well as their immaturity, especially with regard to oral language. Their “voice” can be heard and seen differently by teachers, researchers and families, who filter it according to their own perspectives and their image of the child. Drawing on a range of contemporary New Zealand studies, we discuss some key issues such as whether children need speech to have a voice? And in what ways can we gather children’s perspectives in research and education? To explore children’s perspectives and hear their voices requires skilled and flexible researchers and teachers, who watch and listen carefully whilst being mindful of their filtering/interpretive gazes. This takes time and patience and requires multiple ways of gathering data in order that the child is heard authentically.

year: 2015

title: A Journey Beyond the Bars: Participants' Experiences of Psychological Treatment in a Prison Setting

authors: Terrill, Damian James

subjects: Prison

abstract: This study explored the experiences of high-risk male offenders at varying stages of a prison-based residential rehabilitation programme. Information was elicited by means of 1:1 semi-structured interviews with three adult offenders: one programme completer, one approaching completion and one non-completer. The opinions of three members of unit staff (two programme facilitators and one custodial officer) were also included. Having identified a lack of process-focused qualitative research in the criminological literature, this thesis has attempted to provide an insight into the lived experiences of offenders undergoing a residential rehabilitative intervention. The results are presented through a combined postmodernist, social constructionist discourse. They identify a series of coherent themes which emphasise the importance of numerous contextual, linguistic and communicative variables in dictating the participants’ self-perspectives and engagement with treatment. I will examine in particular, the role of motivation, the importance of the therapeutic bond established between participants and therapists, the relevance of the therapeutic environment, and the impact of both bi-cultural therapy and notions of individual stigmatisation. The overall findings are related to the broader penological literature in order to inspire further experiential analyses of offenders undergoing treatment, and to offer points for consideration in the application of prison-based rehabilitative interventions.

text: A Journey Beyond the Bars: Participants' Experiences of Psychological Treatment in a Prison Setting This study explored the experiences of high-risk male offenders at varying stages of a prison-based residential rehabilitation programme. Information was elicited by means of 1:1 semi-structured interviews with three adult offenders: one programme completer, one approaching completion and one non-completer. The opinions of three members of unit staff (two programme facilitators and one custodial officer) were also included. Having identified a lack of process-focused qualitative research in the criminological literature, this thesis has attempted to provide an insight into the lived experiences of offenders undergoing a residential rehabilitative intervention. The results are presented through a combined postmodernist, social constructionist discourse. They identify a series of coherent themes which emphasise the importance of numerous contextual, linguistic and communicative variables in dictating the participants’ self-perspectives and engagement with treatment. I will examine in particular, the role of motivation, the importance of the therapeutic bond established between participants and therapists, the relevance of the therapeutic environment, and the impact of both bi-cultural therapy and notions of individual stigmatisation. The overall findings are related to the broader penological literature in order to inspire further experiential analyses of offenders undergoing treatment, and to offer points for consideration in the application of prison-based rehabilitative interventions.

year: 2010