title: Origins and development of the lakes

authors: Lowe, David J.

abstract: Because of a turbulent and complex recent geological history, New Zealand has an impressively diverse and dynamic landscape, and a correspondingly wide array of lake types, within a small land area (Irwin 1975a; Soons & Selby 1982;). The development of such an active geological environment in New Zealand has been governed largely by its location athwart the Australian and Pacific plate boundary, and its maritime mid-latitude position has made it particularly sensitive to the climatic fluctations and associated glaciations and sea level changes of the Quaternary Period (Suggate et al. 1978). At present, the rates of uplift and erosion of mountainous areas are among the fastest in the world. Earthquakes are common, and volcanism has characterised much of the North Island during the Quaternary with numerous volcanoes active in the last few thousand years. Large, explosive caldera volcanoes in central North Island have erupted repeatedly over the last million years, producing voluminous amounts of lava and widespread pyroclastic deposits. The landforms, soils and lakes are thus typically youthful, almost all being younger than two million years; indeed, much of the landscape is of late Pleistocene and Holocene age, and is still actively developing (Pillans et al. 1982).

Our purpose in this chapter is to outline the relationship between these often violent and spectacular geological processes which have led to the formation and development of the various lake types in New Zealand. Against this background we describe the classification and distribution of the main lake types, their ages and mechanisms of formation. We also comment on lake sedimentation patterns, palaeolimnological studies, and on features of lake bathymetry and morphology.

text: Origins and development of the lakes Because of a turbulent and complex recent geological history, New Zealand has an impressively diverse and dynamic landscape, and a correspondingly wide array of lake types, within a small land area (Irwin 1975a; Soons & Selby 1982;). The development of such an active geological environment in New Zealand has been governed largely by its location athwart the Australian and Pacific plate boundary, and its maritime mid-latitude position has made it particularly sensitive to the climatic fluctations and associated glaciations and sea level changes of the Quaternary Period (Suggate et al. 1978). At present, the rates of uplift and erosion of mountainous areas are among the fastest in the world. Earthquakes are common, and volcanism has characterised much of the North Island during the Quaternary with numerous volcanoes active in the last few thousand years. Large, explosive caldera volcanoes in central North Island have erupted repeatedly over the last million years, producing voluminous amounts of lava and widespread pyroclastic deposits. The landforms, soils and lakes are thus typically youthful, almost all being younger than two million years; indeed, much of the landscape is of late Pleistocene and Holocene age, and is still actively developing (Pillans et al. 1982).

Our purpose in this chapter is to outline the relationship between these often violent and spectacular geological processes which have led to the formation and development of the various lake types in New Zealand. Against this background we describe the classification and distribution of the main lake types, their ages and mechanisms of formation. We also comment on lake sedimentation patterns, palaeolimnological studies, and on features of lake bathymetry and morphology.

year: 1987

title: A comparison of utility heat exchanger network synthesis for total site heat integration methods

authors: Tarighaleslami, Amir Hossein

abstract: This paper compares Utility Heat Exchanger Network (UEN) design between two Total Site Heat Integration (TSHI) methods, the Conventional Total Site Targeting method (CTST) and the recently developed Unified Total Site Targeting (UTST) method. A large Kraft Pulp Mill plant has been chosen as a case study. Total Site targets have been calculated using a Excel ™ targeting spreadsheet and networks have been designed with the help of Supertaget ™ for both the CTST and UTST methods. To achieve heat recovery and utility targets, both series and parallel utility heat exchanger matches for non-isothermal utilities are allowed in the CTST method, while series matches are allowed in the UTST method if the heat exchangers in series are from the same process. Series matches based on CTST method may create a dependency on two or more separate processes, which operational and control issues may occur, higher piping costs may be imposed, and utility target temperatures may not be achieved in the consecutive processes if one or more processes were to be out of service. Relaxation of the network can resolve these issues for the CTST method; however, if the relaxation occurs on the side of the utility loop that constrains heat recovery, the net heat recovery targets may not be achieved within the Total Site. The UTST method with its modified targeting procedure may offer slightly lower heat recovery targets but with simpler UEN design compared to CTST method are more realistic and achievable. Finally, after UEN design, non-isothermal utility loops need to be balanced in terms of mass and energy for both methods.

text: A comparison of utility heat exchanger network synthesis for total site heat integration methods This paper compares Utility Heat Exchanger Network (UEN) design between two Total Site Heat Integration (TSHI) methods, the Conventional Total Site Targeting method (CTST) and the recently developed Unified Total Site Targeting (UTST) method. A large Kraft Pulp Mill plant has been chosen as a case study. Total Site targets have been calculated using a Excel ™ targeting spreadsheet and networks have been designed with the help of Supertaget ™ for both the CTST and UTST methods. To achieve heat recovery and utility targets, both series and parallel utility heat exchanger matches for non-isothermal utilities are allowed in the CTST method, while series matches are allowed in the UTST method if the heat exchangers in series are from the same process. Series matches based on CTST method may create a dependency on two or more separate processes, which operational and control issues may occur, higher piping costs may be imposed, and utility target temperatures may not be achieved in the consecutive processes if one or more processes were to be out of service. Relaxation of the network can resolve these issues for the CTST method; however, if the relaxation occurs on the side of the utility loop that constrains heat recovery, the net heat recovery targets may not be achieved within the Total Site. The UTST method with its modified targeting procedure may offer slightly lower heat recovery targets but with simpler UEN design compared to CTST method are more realistic and achievable. Finally, after UEN design, non-isothermal utility loops need to be balanced in terms of mass and energy for both methods.

year: 2017

title: A history of Māori literacy success

authors: Derby, Melissa

abstract: This article explores literacy in 19th century Māori society, and in particular, this work considers the initial interactions Māori tribal groups had with literacy following contact with British settlers. The overarching purpose of this article is to respond to the increasingly prevalent suggestion that literacy is a Western competency, and that to be concerned with ensuring Māori children are achieving well in reading and writing is an act of colonisation. This work illustrates that these narratives run counter to the history, behaviour, and values of many tribal groups in New Zealand. More specifically, the historical interactions Māori had with literacy illustrate that both the ability and the desire to succeed in reading and writing was a feature of Māori historical practices. Therefore, to ensure high levels of literacy achievement in contemporary times is not a colonising act but rather aligns with Māori history, behaviour, and values.

text: A history of Māori literacy success This article explores literacy in 19th century Māori society, and in particular, this work considers the initial interactions Māori tribal groups had with literacy following contact with British settlers. The overarching purpose of this article is to respond to the increasingly prevalent suggestion that literacy is a Western competency, and that to be concerned with ensuring Māori children are achieving well in reading and writing is an act of colonisation. This work illustrates that these narratives run counter to the history, behaviour, and values of many tribal groups in New Zealand. More specifically, the historical interactions Māori had with literacy illustrate that both the ability and the desire to succeed in reading and writing was a feature of Māori historical practices. Therefore, to ensure high levels of literacy achievement in contemporary times is not a colonising act but rather aligns with Māori history, behaviour, and values.

year: 2021