title: Change in geomorphology, hydrodynamics and surficial sediment of the Tauranga entrance tidal delta system

authors: Brannigan, Adrian Mark

subjects: Residual Distance Plot

abstract: Historical change in the geomorphology, hydrodynamics, and surficial sediment of the tidal delta system of Tauranga Harbour are investigated with the general aim of analysing The general aims of this thesis are: firstly to analyse historical changes to inlet delta system geomorphology using historical hydrographic charts, secondly, to conduct hydrodynamic numerical modelling using historical bathymetries to access changes in peak spring flow and potential net tidal sediment transport, and thirdly, to analyse historical changes in surficial sediment and bedforms. Geomorphic change was investigated through plotting difference in bathymetry graphs and conducting cross sections taken from digisitied bathymetries obtained from historical hydrographic charts from 1852, 1879, 1901, 1927, 1954 and a modern bathymetry from 2006. Two-dimensional hydrodynamic numerical modelling was conducted to investigate the changes in peak tidal current flow and potential net sediment transport between 1852 and 2006. Changes in surficial sediment patterns were determined through completing a side scan sonar survey with associated sediment samples for ground truthing of grain size and underwater videography to gather surficial shell coverage information. This was used to produce a surficial sediment coverage map which was compared to historical studies Major geomorphological findings include that the shipping channel appears to have induced minor change in the geomorphology of the FTD but such changes are similar to those identified in the historical bathymetries of 1852, 1879, 1901, 1927, 1954 prior to dredging. Significant changes have occurred on the ETD, with the majority of the ETD showing scour of 1 m while the terminal lobe has extended seawards. This is associated with historical (since 1852) narrowing of the inlet from Panepane Point to Mt Maunganui by ~ 900 m. Hydrodynamic numerical modelling has shown a significant increase in potential net tidal sediment transport in the Cutter Channel due to dredging, while the Maunganui Roads Channel shows a reduction of net potential tidal sediment transport that is associated with the dredging of this channel.
The area surrounding Panepane Point undergoes significant increases and decreases in net potential tidal sediment transport both before and after dredging
Investigation of the surficial sediment patterns over the FTD and ETD from sidescan sonar and bottom samples show that between 1983 and 2007 there has been a northwards extension of the area of major shell (greater than 50 %) converge in the main ebb channel as well as reduction in major shell converge in flood tidal delta ebb shield region. The Maunganui Roads Channel changes from sitly sands to medium and fine sands.

text: Change in geomorphology, hydrodynamics and surficial sediment of the Tauranga entrance tidal delta system Historical change in the geomorphology, hydrodynamics, and surficial sediment of the tidal delta system of Tauranga Harbour are investigated with the general aim of analysing The general aims of this thesis are: firstly to analyse historical changes to inlet delta system geomorphology using historical hydrographic charts, secondly, to conduct hydrodynamic numerical modelling using historical bathymetries to access changes in peak spring flow and potential net tidal sediment transport, and thirdly, to analyse historical changes in surficial sediment and bedforms. Geomorphic change was investigated through plotting difference in bathymetry graphs and conducting cross sections taken from digisitied bathymetries obtained from historical hydrographic charts from 1852, 1879, 1901, 1927, 1954 and a modern bathymetry from 2006. Two-dimensional hydrodynamic numerical modelling was conducted to investigate the changes in peak tidal current flow and potential net sediment transport between 1852 and 2006. Changes in surficial sediment patterns were determined through completing a side scan sonar survey with associated sediment samples for ground truthing of grain size and underwater videography to gather surficial shell coverage information. This was used to produce a surficial sediment coverage map which was compared to historical studies Major geomorphological findings include that the shipping channel appears to have induced minor change in the geomorphology of the FTD but such changes are similar to those identified in the historical bathymetries of 1852, 1879, 1901, 1927, 1954 prior to dredging. Significant changes have occurred on the ETD, with the majority of the ETD showing scour of 1 m while the terminal lobe has extended seawards. This is associated with historical (since 1852) narrowing of the inlet from Panepane Point to Mt Maunganui by ~ 900 m. Hydrodynamic numerical modelling has shown a significant increase in potential net tidal sediment transport in the Cutter Channel due to dredging, while the Maunganui Roads Channel shows a reduction of net potential tidal sediment transport that is associated with the dredging of this channel.
The area surrounding Panepane Point undergoes significant increases and decreases in net potential tidal sediment transport both before and after dredging
Investigation of the surficial sediment patterns over the FTD and ETD from sidescan sonar and bottom samples show that between 1983 and 2007 there has been a northwards extension of the area of major shell (greater than 50 %) converge in the main ebb channel as well as reduction in major shell converge in flood tidal delta ebb shield region. The Maunganui Roads Channel changes from sitly sands to medium and fine sands.

year: 2009

title: Limited role of climate change in extreme low rainfall associated with southern Madagascar food insecurity, 2019–21

authors: Harrington, Luke J.

abstract: Southern Madagascar recently experienced a severe food security crisis, made significantly worse by well below average rainfall from July 2019 to June 2021. This exceptional drought has affected a region with high pre-existing levels of vulnerability to food insecurity (subsistence agriculture and pastoralism in the region is rain-fed only), while impacts have been compounded further by COVID-19 restrictions and pest infestations. The rainy seasons of both 2019/20 and 2020/21 saw just 60% of normal rainfall across the Grand South region and was estimated as a 1-in-135 year dry event, only surpassed in severity by the devastating drought of 1990–92. Based on a combination of observations and climate modelling, the likelihood of experiencing such poor rains in the region was not significantly increased due to human-caused climate change: while the observations and models combine to indicate a small shift toward more droughts like the 2019–2021 event as a consequence of climate change, these trends remain overwhelmed by natural variability. This result is consistent with previous research, with the Intergovernmental Panel on Climate Change (IPCC)'s Sixth Assessment Report concluding that any perceptible changes in drought will only emerge in this region if global mean temperatures exceed 2 °C above pre-industrial levels.

text: Limited role of climate change in extreme low rainfall associated with southern Madagascar food insecurity, 2019–21 Southern Madagascar recently experienced a severe food security crisis, made significantly worse by well below average rainfall from July 2019 to June 2021. This exceptional drought has affected a region with high pre-existing levels of vulnerability to food insecurity (subsistence agriculture and pastoralism in the region is rain-fed only), while impacts have been compounded further by COVID-19 restrictions and pest infestations. The rainy seasons of both 2019/20 and 2020/21 saw just 60% of normal rainfall across the Grand South region and was estimated as a 1-in-135 year dry event, only surpassed in severity by the devastating drought of 1990–92. Based on a combination of observations and climate modelling, the likelihood of experiencing such poor rains in the region was not significantly increased due to human-caused climate change: while the observations and models combine to indicate a small shift toward more droughts like the 2019–2021 event as a consequence of climate change, these trends remain overwhelmed by natural variability. This result is consistent with previous research, with the Intergovernmental Panel on Climate Change (IPCC)'s Sixth Assessment Report concluding that any perceptible changes in drought will only emerge in this region if global mean temperatures exceed 2 °C above pre-industrial levels.

year: 2022-12-01

title: Applying Kaupapa Māori Processes to Documentary Film.

authors: Waititi, Kahurangi Rora

subjects: Maori documentary

abstract: This thesis explores the application of Kaupapa Māori processes to documentary filmmaking through practiced-led research. The need for this research came to light through the experience of witnessing unacceptable behaviour shown by film crews towards kaumātua who were attending the 2006 28th Māori Battalion Reunion. In reflecting on this experience and considering my own filming experience as a person with a Te Ao Māori background, the basis for this argument was conceived. This thesis argues that there are alternative ways in which filming can be conducted by considering processes that already exist within Māori practices and philosophies.          

This Thesis, therefore, investigates alternative processes of filming that have developed from a Kaupapa Māori perspective through practical filming experience.  An historical overview of the relationship between Māori, media and filming practices have been provided to give context to this discussion.  The application of Kaupapa Māori processes to film was considered through the use of Marae protocol and philosophies. The application of these concepts was supported by the creative research which was utilised by referencing specific examples. The reader is, therefore, instructed to refer to the DVD in the front of the thesis as referenced in the written text.

text: Applying Kaupapa Māori Processes to Documentary Film. This thesis explores the application of Kaupapa Māori processes to documentary filmmaking through practiced-led research. The need for this research came to light through the experience of witnessing unacceptable behaviour shown by film crews towards kaumātua who were attending the 2006 28th Māori Battalion Reunion. In reflecting on this experience and considering my own filming experience as a person with a Te Ao Māori background, the basis for this argument was conceived. This thesis argues that there are alternative ways in which filming can be conducted by considering processes that already exist within Māori practices and philosophies.          

This Thesis, therefore, investigates alternative processes of filming that have developed from a Kaupapa Māori perspective through practical filming experience.  An historical overview of the relationship between Māori, media and filming practices have been provided to give context to this discussion.  The application of Kaupapa Māori processes to film was considered through the use of Marae protocol and philosophies. The application of these concepts was supported by the creative research which was utilised by referencing specific examples. The reader is, therefore, instructed to refer to the DVD in the front of the thesis as referenced in the written text.

year: 2007