The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform
Nick Harvey - One of the best experts on this subject based on the ideXlab platform.
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Protecting private properties from the sea: Australian policies and practice
Marine Policy, 2019Co-Authors: Nick HarveyAbstract:Abstract The vulnerability of private Coastal properties is a global issue which has arisen largely because of a lack of understanding of Coastal processes. In some countries where government authorities have a long history of funding private property Protection works the sustainability and ethics of policies have been questioned together with debate over public rights and the rights of property owners. In Australia, where Coast Protection is a responsibility of state governments there is a variation in policies and legislation relating to planning approvals for Coast Protection works in front of private properties. This paper examines the different Australian policies and uses examples from practice to illustrate these differences. The paper notes a wide variation in the ratio of public versus private funding which does not always match the relative proportion of benefit gained from Protection works. The paper concludes that there is a complex pattern of individual state-based Coastal policies, legislation and guidelines related to Protection of private Coastal properties. These have an underlying principle that Protection works must be fully assessed in the context of effects on the adjacent Coast and neighbouring properties. In reality, this requires a detailed understanding of Coastal processes, particularly sediment movement, within broad sections of the Coast referred to as sediment cells. Such an integrated approach has been introduced to some state-based Australian Coastal legislation and strategies.
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Vulnerability and adaptation to climate change on the South Australian Coast: a Coastal community perspective
Transactions of the Royal Society of South Australia, 2015Co-Authors: Christopher Button, Nick HarveyAbstract:Over the last 20 years the intergovernmental panel on climate change has produced a number of assessments on global climate change impacts, adaptation and vulnerability. In 2009, the Australian government conducted its own assessment of climate change risks to the Australian Coast. In South Australia, there has been progress in actions to address issues for climate change mitigation and adaptation. Of particular note are the South Australian policies on Coast Protection and new Coastal development (1991), and Coastal erosion, flooding and sea-level rise (1992). These state policies remain in place despite recent debate in the literature over global and regional rates and potential impacts of sea-level rise, which show sea-level rise is tracking at the upper end of projections. An increasing Coastal population and a growing amount of Coastal property and related infrastructure deemed ‘at risk’, is also creating pressure to review Coastal policies nationwide. This paper presents an assessment of the vulnera...
Jim W. Hall - One of the best experts on this subject based on the ideXlab platform.
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Simulating the Shore and Cliffs of North Norfolk
Advances in Global Change Research, 2015Co-Authors: Mike Walkden, Mark E. Dickson, James Thomas, Jim W. HallAbstract:This chapter describes geomorphic modelling of the main Norfolk study area, the 50 km of the Coast between Blakeney Spit and Winterton Ness, specifically the eroding cliffs, shore platforms, beaches, dunes and Coast Protection structures. The models represent both the natural eroding Coastal system and past and future management interventions. Numerical experiments are also used to explore the possible dynamics of this Coast if it were in a natural state.
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Flood Risk Assessment for Shoreline Management Planning
2003Co-Authors: Richard Dawson, Jim W. Hall, Paul Sayers, P B BatesAbstract:This paper describes how modeling and decision-support that are currently becoming available will make it possible to conduct quantified risk-based appraisals of options for shoreline management. These methodologies form part of a hierarch of risk-based methods that also include a national-scale methodology for flood risk-assessment and detailed methods for the appraisal of individual Coast Protection and flood defense projects. This paper focuses on the assessment of Coastal flood risk as part of the Shore Management Planning process. A methodology is proposed for the analysis of the performance and interaction of systems of defenses that will protect low-lying Coastal areas from flooding. The methodology includes the statistical analysis of waves and water levels, simplified reliability analysis of flood defense systems, rapid hydrodynamic modeling of inundation of Coastal floodplains and the evaluation of the economic and social impacts of flooding. The method s demonstrated in a flood risk analysis at Towyn Bay on the Northern Coast of Wales.
Mike Walkden - One of the best experts on this subject based on the ideXlab platform.
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MODELLING RAPID CoastAL CATCH-UP AFTER DEFENCE REMOVAL ALONG THE SOFT CLIFF Coast OF HAPPISBURGH, UK
Coastal Engineering Proceedings, 2018Co-Authors: Andres Payo, Mike WalkdenAbstract:There are currently no well-established methods of predicting Coastal catch-up, i.e. the response of shores to the removal of existing Coast Protection. Such estimates are vital to inform decisions around the renewal of such structures. At a deeper level, the lack of predictive methods undermines progress towards more sustainable approaches to Coastal management, and the implementation of policies of managed realignment. Some progress has been made in recent years using the SCAPE numerical modelling tool (e.g. Walkden et al, 2015). That study demonstrated Coastal response that included retreat beyond the position the shore would have been expected to reach in the absence of Coast Protection (i.e. Coast Protection apparently causing a net loss of land). That study raised important questions, but was limited in the respect that it represented the Coast in two-dimensions (i.e. without alongshore interactions). In this work we illustrate how the novel Coastal Modelling Environment (CoastalME, Payo et al. 2017) is able to reproduce Coastal catch-up at Happisburgh at the East Coast of UK, and to do so with more physical realism than was possible with the SCAPE model, including accounting for alongshore variations).
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Simulating the Shore and Cliffs of North Norfolk
Advances in Global Change Research, 2015Co-Authors: Mike Walkden, Mark E. Dickson, James Thomas, Jim W. HallAbstract:This chapter describes geomorphic modelling of the main Norfolk study area, the 50 km of the Coast between Blakeney Spit and Winterton Ness, specifically the eroding cliffs, shore platforms, beaches, dunes and Coast Protection structures. The models represent both the natural eroding Coastal system and past and future management interventions. Numerical experiments are also used to explore the possible dynamics of this Coast if it were in a natural state.
A. Anonymous - One of the best experts on this subject based on the ideXlab platform.
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A Case Study Documenting Monitoring and Modelling Techniques used at Bournemouth, UK: A Local-Specific Approach to Coastal Monitoring
2005Co-Authors: A. AnonymousAbstract:Predictions of the state of the future Coastline as a reaction to the changes in climate have lead to revisions in the future Coast Protection policies necessary to protect the Bournemouth Coastline. In optimising the most economic solutions for the future Coast Protection of the Coastline, alternative defences have been examined and costed, together with an assessment of the level of benefits if such defences were to be implementd(www.bournemouth.gov.uk/Residents/Environment/Coastal_Management.asp, 2005). A vital part of any Coastal defence scheme is accurate monitoring data that allows for an understanding of current and past patterns in Coastal evolution. This information is essential to inform shoreline management planning and design conditions for operational flood and Coastal defence strategies. Long-term local Coastal monitoring programmes as operated by Bournemouth Borough Council, have demonstrated considerable cost-savings, allowing greater confidence in efficient design of Coastal works.
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Structural design report for LCS (low crested structures): Final report
2004Co-Authors: A. AnonymousAbstract:This report presents additional information and new formulae not included in Delos report D22. Existing formulae for the design of LCS's for Coast Protection structures can be found in D22 and are therefore not repeated in this report.
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Low cost rock structures for beach control and Coast Protection: Practical design guidance SR 631
2003Co-Authors: A. AnonymousAbstract:Coastal rock structures are widely used in Coastal engineering for a variety o f purposes, includiag controlling the morphological development of beaches and providing Protection against Coastal erosion or flooding by wave overtopping. Strict adherence to existing design guidance has resulted in many of these structures being built using multiple layers of different rock sizes, high quality imported rock and carefully prepared foundations. Some innovative structures have, however, used locally available rock with simpler cross-sections placed on unprepared foundations, apparently without significant reduction to the overall erformance of the scheme. This report gives guidance from a short research project which examined practical experience on rock structures firom around the UK, with particularly emphasis on those that depart from conventional design rules. The report demonstrates that there are opportunities for lower cost rock structures for beach control and Coast Protection. Established design guidance provides a good degree of confidence in predictions of performance o f Coastal structures, but it is widely perceived that simple design rules can be overly prescriptive, particularly for nearshore structures in shallow water depths. The opportunities for lower cost structures principally relate to improved assessment of armour size for depth-limited waves, reduction in armour size for closer armour packing, and the need for complex underlayer / filters. The report emphasises the need to understand the performance of individual structures in the context of the overall scheme and ultimately national objectives, which provides an incentive to re-explore the balance between cost and structure performance. It also encourages the consideration of cost issues during the design of rock structures. Although the use of lower cost structures may also provide safety and environmental advantages, the stractures described are envisaged to be of greatest benefit in locations where conventional stractures would not be economically justified.
W. Allsop - One of the best experts on this subject based on the ideXlab platform.
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Surf reefs - physical modelling results, not pipe dreams
2013Co-Authors: T. Rigden, W. Allsop, T. Stewart, A. JohnsonAbstract:This paper discusses the diverse needs for near-shore reefs required to serve for both Coast Protection and to improve surfing, and how they impact on each other when a multi-purpose reef is designed. Two case studies using extensive physical modelling are discussed. At Borth, the modelling looked at optimising the design of two offshore multi-purpose reefs as part of a wider Coastal defence scheme. Initial designs were changed to a single multi-purpose reef after the physical modelling showed that wave interactions between the reefs reduced their overall surfability, further contribution to Coast Protection were provided by an additional low crested breakwater. At Jumeirah, the modelling tested a single multi-purpose reef and its effect on the shoreline position in its lee. The modelling showed that the reef was able to produce a degree of surfable waves and also had an impact on the Coast Protection behind it. The authors of this paper believe that the physical modelling of the reefs allowed beneficial design refinement of the multi-purpose reefs to increase their effectiveness for both surfing and Coast Protection.
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Low Cost Rock Structures for Beach Control and Coast Protection: Practical design guidance
2003Co-Authors: M. Crossman, S. Segura-dominguez, W. AllsopAbstract:Coastal rock structures are widely used in Coastal engineering for a variety of purposes, including controlling the morphological development of beaches and providing Protection against Coastal erosion or flooding by wave overtopping. Strict adherence to existing design guidance has resulted in many of these structures being built using multiple layers of different rock sizes, high quality imported rock and carefully prepared foundations. Some innovative structures have, however, used locally available rock with simpler cross-sections placed on unprepared foundations, apparently without significant reduction to the overall performance of the scheme. This report gives guidance from a short research project which examined practical experience on rock structures from around the UK, with particularly emphasis on those that depart from conventional design rules. The report demonstrates that there are opportunities for lower cost rock structures for beach control and Coast Protection. Established design guidance provides a good degree of confidence in predictions of performance of Coastal structures, but it is widely perceived that simple design rules can be overly prescriptive, particularly for nearshore structures in shallow water depths. The opportunities for lower cost structures principally relate to improved assessment of armour size for depth-limited waves, reduction in armour size for closer armour packing, and the need for complex underlayer / filters. The report emphasises the need to understand the performance of individual structures in the context of the overall scheme and ultimately national objectives, which provides an incentive to re-explore the balance between cost and structure performance. It also encourages the consideration of cost issues during the design of rock structures. Although the use of lower cost structures may also provide safety and environmental advantages, the structures described are envisaged to be of greatest benefit in locations where conventional structures would not be economically justified.
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Stability of rock armoured beach control structures
1994Co-Authors: W. Allsop, R.j. JonesAbstract:Control of shingle beaches for Coast Protection and/or sea defence may require use of rock groynes or shore-detached breakwaters. Experience from Coast Protection schemes on shingle beaches along the south Coast of England however suggests that some control structures, including rock groynes and rubble revetments, have suffered greater damage than had been expected. This damage seems to have been most closely associated with steeper beach slopes. This report summarises information from recent research studies on the stability/damage behaviour of rock armour on 4 general beach control structures: a) simple 1:2 rubble sea wall slope; b) rock bastion or roundhead groyne; c) inclined crest rock groyne; d) L-shaped rubble groyne adapted from b) above. The report is aimed at Coastal engineers who require information on the analysis/design of rock armoured beach control structures. It summarises data from a number of previous studies by HR Wallingford and co-workers, and includes results from recent wave basin tests.