Time filter

Source Type

Wellington, New Zealand

Calder M.,Aurecon | Kennedy D.M.,University of Melbourne
Journal of Coastal Research | Year: 2013

Ground penetrating radar (GPR) is a new technique in field sciences and is now commonly applied to studies of coastal dunes and beaches. The technique has yet to be applied on hard rocky coasts, and its ability to discern subsurface stratigraphy has great potential for investigating landform evolution on tectonically active shorelines where erosional surfaces are often buried by sediments derived from marine and nonmarine sources. In this study, we test the resolution of a 100- and 250-MHz GPR system on a series of Holocene uplifted shore platforms and gravel beaches in Wellington, New Zealand. The sediment thickness at the sites investigated ranged from a thin veneer to many meters and is composed of a mix of sand and gravel-sized material. It was found that the 100-MHz antenna did not have the resolution of the 250-MHz antenna and could not distinguish the buried platform surface. Using the 250-MHz antenna, bedding features within the unconsolidated sediment and the bedrock-sediment interface could be discerned. The high relief of the bedrock (meter scale), which outcropped on the surface, and the presence of buried boulders caused significant interference to the radar profiles through the creation of multiple and hyperbolic reflections. Despite these reflections, the GPR was able to quantify the morphology of the buried shore platform, thus indicating the utility of this technique for rocky coast research. © 2013, the Coastal Education & Research Foundation (CERF). Source

Greaves P.,Aurecon
EngineerIT | Year: 2015

Data centres are strategic business assets and they facilitate a company's performance and the services they are able to provide their customers. The criticality of data centres continues to rise, leading more industry-wide discussions regarding what "mission critical" means and how data centre owners can minimise the risk of downtime in their facilities. Source

Olson D.,Victoria University of Wellington | Kennedy D.M.,Greater Wellington Regional Council | Dawe I.,Aurecon | Calder M.,Victoria University of Wellington
Earth Surface Processes and Landforms | Year: 2012

Uplift of the shoreline in tectonically-active areas can have a profound influence on geomorphology changing the entire process dynamics of the coast as the landforms are removed from the influence of the sea. Over decadal timescales it is possible for the landforms to return to their pre-earthquake condition and this paper examines the re-establishment of mixed sand and gravel beaches on the coast of Wellington, New Zealand, subsequent to an uplift event in 1855. Over 60 topographic profiles were surveyed, seven sets of aerial photographs from a 67year period were mapped and sediment size analyses conducted in order to quantify the nature of beach change following uplift, and associated relative sea level fall. These data were supported by surveys using ground penetrating radar. It is found that uplift raised the gravel beaches out of the swash zone thereby removing them from the littoral zone. Intertidal rocky reefs which occur between each embayment were also uplifted during the same event and completely interrupted the longshore transport system. Continued input of gravel material to the littoral zone allowed beaches to re-establish sequentially along the coast as each embayment was infilled with sediment. This reconnection of the embayments with the longshore drift system is associated with the beach planform being initially drift dominated during infill but then switching to swash alignment once the embayment becomes infilled. This has resulted in shoreline accretion of over 100m in some places, at rates of up to 4m/yr, covering shore protection works built in the past few decades. The ability of the shore to adjust back to its pre-uplift condition appears to be a function of the accommodation space created during uplift and the rate of sediment supply. © 2012 John Wiley & Sons, Ltd. Source

Varming C.,Aurecon
Coasts and Ports 2013 | Year: 2013

Aurecon in joint venture with Halcrow was retained by Dawei Development Company to assist with the Master Planning and detailed design of the proposed Dawei Port in Myanmar. Through an extensive trade projection study a range of local, national and international cargo origins were identified and potential volumes estimated. This was driving the port configuration as this has to match the cargo type and mode of movement of the cargo. Having gathered all the relevant site data an optimised port configuration was developed which offered significant benefits to the client including reduced capital cost and improved operations. The proposed development will potentially include 8 container berths, 8 dry bulk and 8 liquid bulk berths as well as 27 general cargo berths stretching across some 13,000 m. To accommodate some of the anchor tenants the port will need to be able to cater for large bulk carriers which require significant dredging and reclamation. Working closely with the client a suitable level of flexibility was built into the terminal quay design to optimise flexibility and minimise disruptions in future stages of development. Source

Nielsen R.,Aurecon
Coasts and Ports 2013 | Year: 2013

The final stage of the third Coal Export Terminal in the Port of Newcastle is nearing completion and will expand the coal export capacity of the Newcastle Coal Infrastructure Group (NCIG) to 66 million tonnes per annum (Mtpa). Completed in 2010, Stage 1 of the terminal was a greenfield project with the largest initial coal export capacity (30 Mtpa) of any Australian coal terminal. Right on the back of Stage 1, NCIG commenced Stage 2AA expansion and increased the coal export capacity to 53 Mtpa in 2012. NCIG is now completing the third expansion (Stage 2F) which will increase the terminal's capacity to the planned maximum 66 Mtpa. The design of the terminal was influenced by four key objectives: a) improving rail logistics by implementing dedicated stockpiles at the terminal and a stockpile driven supply chain; b) maximising coal storage capacity; c) reducing capital and operating expenditure through innovative automation, fewer yard machines and lower operating requirements; and d) improving shiploading efficiencies. Source

Discover hidden collaborations