Entity

Time filter

Source Type

Los Angeles, CA, United States

AECOM Technology Corporation is a professional technical and management support services firm. Ranked in terms of revenue from design projects, the company was the number one design firm for 2010 and 2011 by Engineering News-Record and ranked number one by Architectural Record for 2008. It provides services in the areas of transportation, planning, environmental, energy, water and government. With approximately 45,000 employees in 2012, AECOM is listed at #353 on the Fortune 500 list. Wikipedia.


Byrnes J.,AECOM Technology Corporation
Utilities Policy | Year: 2013

This paper provides a synopsis of the current regulatory and institutional arrangements that pertain to the urban water and wastewater sector in Australia. A short and selected institutional history of the urban water sectors in the Australian cities of Sydney and Melbourne is outlined, followed by an analysis of the relative effectiveness of the institutional structures in enabling the sector to respond to the challenges faced by the sector in the future. © 2012 Elsevier Ltd. Source


Gibbs M.T.,AECOM Technology Corporation | Thebaud O.,CSIRO
Fish and Fisheries | Year: 2012

While there has been a growing concern for the adverse ecological impacts of fishing, progress on incorporating these into operational fisheries management has been slow. Many fisheries management organizations have addressed the problem of overharvesting and over-capitalization first. In this domain, the question of access regulation has gained growing recognition as a key dimension of fisheries sustainability, leading to recommendation and progressive implementation of rights-based systems, in particular Individual Transferrable Quotas (ITQs). While adjustments in fishing capacity resulting from the implementation of these systems may entail a reduction in some unwanted ecosystem impacts of fishing, it is also recognized that they will not be sufficient to achieve the ecological outcomes increasingly demanded by the global community. There is thus a need to examine the possibilities for a common management framework for dealing with both over-capitalization of fisheries and adverse ecological effects of fishing. In this paper, we examine the feasibility of incorporating greater ecosystem goods and services into ITQ policy instruments initially designed with a narrow focus on commercial target species. We consider the advantages and limitations of alternative approaches in this respect and identify some of the practical issues associated with the different alternatives, in particular the underpinning knowledge requirements. We argue that given the need for increasingly streamlined management processes, further investigation into practical ways forward in this domain is crucial if management of fisheries is to achieve economic efficiency while fully encompassing the ecologically sustainable development objectives of ecosystem-based fisheries management. © 2011 Blackwell Publishing Ltd and Commonwealth of Australia. Source


Robin Sham S.H.,AECOM Technology Corporation
Proceedings of the Institution of Civil Engineers: Bridge Engineering | Year: 2015

The 6·15-km-long Padma road and rail bridge will become a landmark structure in Bangladesh and one of the largest river crossings in the world. The design encountered significant engineering challenges, particularly from the hostile site conditions and the merciless forces of nature. During the monsoon season the Padma River becomes fast flowing, and is susceptible to deep scour, demanding deep, piled foundations. The bridge site is also in an area of considerable seismic activity, leading to significant seismic loads being exerted on the structure. In the design, extensive engineering studies were conducted, advanced computational analyses were employed and innovative engineering solutions were developed to ensure that the bridge will be able to survive the challenges of nature in its long design working life. The project has accumulated a significant body of knowledge in seismic-resilient and scour-tolerant design, and it has advanced understanding of bridge behaviour in conditions of severe earthquake and deep riverbed scour. Source


Brumm A.,University of Wollongong | McLaren A.,AECOM Technology Corporation
Journal of Human Evolution | Year: 2011

This paper investigates patterns of scraper retouch at the Lower Palaeolithic site of High Lodge, England. The unifacial scrapers from High Lodge are intensively retouched tools with regular and complex shapes that have been routinely interpreted as evidence of intentional design. The primary aim is to determine whether the different scraper types identified in the assemblage represent discrete and discontinuous implement categories made according to fixed designs, or rather, points or stages along one or more reduction continuums. To achieve this, we apply a range of quantitative measures of artifact reduction to all complete single, double, convergent, and transverse scrapers from the site (n=165). Our results indicate that morphological and typological diversity in the High Lodge scraper assemblage can be parsimoniously explained as a result of both the extent to which implements were resharpened during use and subtle variability in the nature of blank forms selected for retouch. Accordingly, we critique the notion that high levels of morphological complexity in retouched Lower Palaeolithic tool types necessarily reflect the imposition of preconceived forms on stones. © 2010 Elsevier Ltd. Source


Cheuk C.Y.,AECOM Technology Corporation | White D.J.,University of Western Australia
Geotechnique | Year: 2011

The as-laid embedment of a seabed pipeline is an important design parameter. As a pipe is laid on the seabed it oscillates, owing to vessel motion and hydrodynamic loading of the hanging pipe. This movement significantly increases the pipe embedment beyond the theoretical value related to the static pipe weight, even when corrected for any stress concentration caused by the hanging catenary. Dynamic lay effects are either ignored in practice, or are accounted for by scaling up the static embedment by an empirical factor, leading to significant uncertainty in this important design parameter. A series of centrifuge model tests has been conducted using two clays - kaolin and a high-plasticity natural clay - to simulate the dynamic embedment process. The results indicate that only a few cycles of small-amplitude oscillation (60.05D) are required to double or triple the pipe embedment, owing to the combined effect of lateral ploughing and soil softening. In these experiments the pipe embedment increased to up to eight times the static embedment after 100 cycles of motion, which represents a typical lay process. A model is proposed for the cycleby- cycle embedment of a pipeline under a given sequence of small-amplitude oscillations at a given applied vertical force. The trajectory of the pipe movement is assessed using a flow rule derived from plasticity-based yield envelopes. The effect of soil remoulding is explicitly captured by linking the accumulated disturbance to the decay in soil strength. Using input parameters derived from theoretical considerations and T-bar penetrometer tests, the model captures the essential features of the dynamic embedment process. With modest optimization of the model parameters, the mean discrepancy between the calculated and measured embedment is only 12% for both clays. The ultimate states predicted by this cycle-bycycle model also provide a rough estimate of the maximum pipe embedment for fully remoulded conditions, which include some degree of water entrainment caused by the lay process, evident in the optimised parameters. This ultimate embedment is governed by the remoulded soil strength and the pipe weight (augmented by any stress concentration). The amplitude of the cyclic motion affects the rate of softening, and hence the rate of settlement. This model provides a framework for assessing the as-laid embedment of seabed pipelines on a more rigorous basis than current practice. Source

Discover hidden collaborations