title: Subseafloor Investigation of Sediments at Southern Tauranga Harbour, New Zealand, before Capital Dredging

authors: Jorat, M. Ehsan

subjects: Science & Technology

abstract: The Port of Tauranga plays a key role in New Zealand's export–import industry, and capital dredging commenced in October 2015 to extend the shipping channels to accommodate larger container vessels. This study investigated two-dimensional and three-dimensional subsurface estuarine sediment stratigraphy to predict the sedimentological conditions encountered during dredging operations to ensure that appropriate dredging methodologies were used to minimise the generation of turbidity. Eight cone penetration tests (CPTs), 14 core descriptions, and a high-resolution seismic investigation in Stella Passage (the main shipping channel of Tauranga Harbour) provided the basis for this research. Six major units comprise the stratigraphy; in ascending order they are lower pumiceous sand and silt (UNIT6), quartz-feldspar sand and silt (UNIT5), middle pumiceous sand and silt (UNIT4), silt–sand–clay (UNIT3), upper pumiceous sand and silt (UNIT2), and Holocene marine (UNIT1) sediments forming the modern seafloor. Three paleovalleys filled with sediments from UNIT2 were identified extending west to east across the channel. The CPT profiles were correlated with the seismostratigraphic units and their corresponding soil behaviour type to characterise each unit's sediment stiffness. The UNIT6 is unlikely to be encountered in current and future capital dredging operations because it is the lowest observed unit. A special dredging methodology may be required for UNIT5 and UNIT4 as they have high CPT tip resistance and undrained shear strength. For UNIT3, UNIT2, and UNIT1, which have very low CPT tip resistance and undrained shear strength, trailing suction and cutter suction dredging is appropriate. The potential turbidity of the water column, however, could impose a significant threat to marine biota and has to be taken into account.

text: Subseafloor Investigation of Sediments at Southern Tauranga Harbour, New Zealand, before Capital Dredging The Port of Tauranga plays a key role in New Zealand's export–import industry, and capital dredging commenced in October 2015 to extend the shipping channels to accommodate larger container vessels. This study investigated two-dimensional and three-dimensional subsurface estuarine sediment stratigraphy to predict the sedimentological conditions encountered during dredging operations to ensure that appropriate dredging methodologies were used to minimise the generation of turbidity. Eight cone penetration tests (CPTs), 14 core descriptions, and a high-resolution seismic investigation in Stella Passage (the main shipping channel of Tauranga Harbour) provided the basis for this research. Six major units comprise the stratigraphy; in ascending order they are lower pumiceous sand and silt (UNIT6), quartz-feldspar sand and silt (UNIT5), middle pumiceous sand and silt (UNIT4), silt–sand–clay (UNIT3), upper pumiceous sand and silt (UNIT2), and Holocene marine (UNIT1) sediments forming the modern seafloor. Three paleovalleys filled with sediments from UNIT2 were identified extending west to east across the channel. The CPT profiles were correlated with the seismostratigraphic units and their corresponding soil behaviour type to characterise each unit's sediment stiffness. The UNIT6 is unlikely to be encountered in current and future capital dredging operations because it is the lowest observed unit. A special dredging methodology may be required for UNIT5 and UNIT4 as they have high CPT tip resistance and undrained shear strength. For UNIT3, UNIT2, and UNIT1, which have very low CPT tip resistance and undrained shear strength, trailing suction and cutter suction dredging is appropriate. The potential turbidity of the water column, however, could impose a significant threat to marine biota and has to be taken into account.

year: 2017-03-01

title: Time in Early Modern Islam: Calendar, Ceremony, and Chronology in the Safavid, Mughal and Ottoman Empires [Book Review]

authors: Drury, Abdullah

abstract: This article reviews the book 'Time in Early Modern Islam: Calendar, Ceremony, and Chronology in the Safavid', Mughal and Ottoman Empires, by Stephen P. Blake.

text: Time in Early Modern Islam: Calendar, Ceremony, and Chronology in the Safavid, Mughal and Ottoman Empires [Book Review] This article reviews the book 'Time in Early Modern Islam: Calendar, Ceremony, and Chronology in the Safavid', Mughal and Ottoman Empires, by Stephen P. Blake.

year: 2013-07

title: Hoea Te Waka ki Uta: Critical Kaupapa Māori Research and Mormon Studies Moving Forward

authors: Simon, Hemopereki

abstract: The following is a reflective commentary on the place of Critical Indigenous Studies, with a focus on Kaupapa Māori Research, within Mormon Studies. Specifically, the piece explores the following questions: What does Kaupapa Māori Research look like when engaging in Mormon Studies? What positionality needs to be taken by Kaupapa Māori researchers and Critical Indigenous scholars when engaging in Mormon Studies? What are the main areas Critical Indigenous scholars and Kaupapa Māori scholars should engage when tackling issues around Mormonism? These questions are important in light of the growing importance of the cultural renaissance in Te Ao Māori and the rise of Kaupapa Māori Research.

text: Hoea Te Waka ki Uta: Critical Kaupapa Māori Research and Mormon Studies Moving Forward The following is a reflective commentary on the place of Critical Indigenous Studies, with a focus on Kaupapa Māori Research, within Mormon Studies. Specifically, the piece explores the following questions: What does Kaupapa Māori Research look like when engaging in Mormon Studies? What positionality needs to be taken by Kaupapa Māori researchers and Critical Indigenous scholars when engaging in Mormon Studies? What are the main areas Critical Indigenous scholars and Kaupapa Māori scholars should engage when tackling issues around Mormonism? These questions are important in light of the growing importance of the cultural renaissance in Te Ao Māori and the rise of Kaupapa Māori Research.

year: 2021