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A Uav Photogrammetry Dfn Modelling Approach Of Analysing Rockfall Along Aucklands Coastal Cliffs
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Book Synopsis A UAV Photogrammetry/DFN Modelling Approach of Analysing Rockfall Along Auckland's Coastal Cliffs by : Kathryn Ryder
Download or read book A UAV Photogrammetry/DFN Modelling Approach of Analysing Rockfall Along Auckland's Coastal Cliffs written by Kathryn Ryder and published by . This book was released on 2019 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rock fracture properties contribute significantly to rock slope stability across a range of lithological settings in New Zealand, and globally. However, there is often limited access to outcrops due to the hazards involved, which limits traditional field exposure mapping/logging. This project uses Unmanned Aerial Vehicle (UAV) photogrammetry to model selected rocky cliffs along Auckland's coast and then uses Sirovision software to delineate and model fractures. Fracture properties extracted from Sirovision can then be used for Discrete Fracture Network (DFN) modelling, which was used to assess the stability of the exposed slopes. The results show that this can be an effective approach for conducting realistic rock stability modelling at poorly accessible sites. However, there are limitations to the workflow of UAV photogrammetry and Sirovision. In particular, it is problematic to characterise fracture roughness, waviness, strength and spacing in Sirovision, given the resolutions involved. Nevertheless, the application of this method has great potential for rock stability modelling of natural slopes, tunnels, quarries, mines, or excavations where accessibility is an issue.
Book Synopsis Rockfall Patterns and Recession of Coastal Cliffs on the North Shore of Auckland, NZ by : Natasha Louise Goldring
Download or read book Rockfall Patterns and Recession of Coastal Cliffs on the North Shore of Auckland, NZ written by Natasha Louise Goldring and published by . This book was released on 2015 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Patterns of coastal cliff recession were measured at two sites composed of Waitemata Group rocks on the North Shore of Auckland, New Zealand. High resolution terrestrial laser scanning (TLS) and terrestrial digital photogrammetry (TDP) were used to investigate rock fall patterns and to quantify the geomechanical properties of each field site. Long Bay was scanned using TLS over a seven month period (12th June 2014 - 10th December 2014) while Rothesay Bay was scanned over an eleven month period (13th March 2014 - 7th January 2015). These datasets have been supplemented with data from historical laser surveys enabling medium term (≤ 13 years) recession patterns to be determined. Cliff recession rates in Auckland, ranging between 3.5-180mm y-1, have previously been determined using historical photographs, cliff-edge distances to structures, and using proxy data, such as shore platform widths. However, the research described in this thesis provides a much higher precision understanding of recession rates over scales of months to a decade (26± 7 mm y-1 recession). Change detection maps, cross-sectional profiles and volumetric statistics show a large contrast in rockfall patterns between the two field sites. Structural analyses confirm that these differences result from local geomechanical controls: weighted joint densities (1.31 and 2.92), maximum block volumes (81.7m3 and 13.07m3) and average rockfall volumes (0.1-0.2m3 and 0.0001-0.01 m3) show large differences between Rothesay Bay and Long Bay respectively. Long Bay change detection maps were characterised by sporadic, isolated block falls whereas Rothesay Bay maps showed spatial and temporal patterns, including upward rockfall propagation at the cliff toe. This upward propagation event combined with recent observations of wave transformation across the Rothesay Bay shore platform indicates that waves actively erode the cliff toe at the field site. Joint block fall has been confirmed through kinematic analysis to be the principal mechanism causing medium-term (≤ 13 years) erosion at both field sites. Upward propagation and joint block fall patterns were found to be facilitated by weak siltstone/mudstone units (UCS values of 136 KPa and 132 KPa) which, through their removal, induced cantilever failure of large jointed sandstone blocks. The two TLS datasets described in this study represent a substantial advance in the understanding of spatial and temporal patterns of rockfall for Waitemata Group rocks in Auckland, New Zealand. Both TDP and TLS datasets also highlight the advantage of high resolution datasets and the need to establish long term TLS monitoring datasets to enable accurate quantification and therefore effective management of coastal cliffs.
Book Synopsis Rock Mass Characterization and Numerical Modelling of Coastal Cliff Stability in the Auckland Region by : Megan Louise Baddiley
Download or read book Rock Mass Characterization and Numerical Modelling of Coastal Cliff Stability in the Auckland Region written by Megan Louise Baddiley and published by . This book was released on 2012 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fine-grained Sediments by : Dorrick A. V. Stow
Download or read book Fine-grained Sediments written by Dorrick A. V. Stow and published by . This book was released on 1984 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: