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Louinord Voltaire - One of the best experts on this subject based on the ideXlab platform.

  • Contingent valuation analysis of willingness to pay for Beach Erosion control through the stabiplage technique: A study in Djerba (Tunisia)
    Marine Policy, 2017
    Co-Authors: Abderraouf Dribek, Louinord Voltaire
    Abstract:

    Beach Erosion can have major economic implications because of the potential impact on coastal recreation demand – particularly for countries where coastal tourism is one of the main sources of external revenue. Djerba Island (Tunisia) falls in that category. With about 125 km of coastline, Djerba Island is one of the most important Tunisian destinations. However, the island is experiencing coastal Erosion problems. The Tunisia government launched a project to fight costal Erosion through the Stabiplage technique. This study provides the first economic valuation of Beach Erosion control in Tunisia and is the first one that focuses on the Stabiplage technique. Specifically, a contingent valuation survey is carried out to elicit the public willingness to pay (WTP) for the project. An interval payment card question format is used to obtain information about WTP from representative samples of residents and tourists in Djerba. The results reveal a positive WTP for the project. Aggregate WTP estimates range from €133,459 (median value) to €5,180,269 (mean value). These values can help inform decisions about whether to undertake the project based on either the benefit-cost ratio rule or majority voting

  • contingent valuation analysis of willingness to pay for Beach Erosion control through the stabiplage technique a study in djerba tunisia
    Marine Policy, 2017
    Co-Authors: Abderraouf Dribek, Louinord Voltaire
    Abstract:

    Abstract Beach Erosion can have major economic implications because of the potential impact on coastal recreation demand – particularly for countries where coastal tourism is one of the main sources of external revenue. Djerba Island (Tunisia) falls in that category. With about 125 km of coastline, Djerba Island is one of the most important Tunisian destinations. However, the island is experiencing coastal Erosion problems. The Tunisia government launched a project to fight costal Erosion through the Stabiplage technique. This study provides the first economic valuation of Beach Erosion control in Tunisia and is the first one that focuses on the Stabiplage technique. Specifically, a contingent valuation survey is carried out to elicit the public willingness to pay (WTP) for the project. An interval payment card question format is used to obtain information about WTP from representative samples of residents and tourists in Djerba. The results reveal a positive WTP for the project. Aggregate WTP estimates range from €133,459 (median value) to €5,180,269 (mean value). These values can help inform decisions about whether to undertake the project based on either the benefit-cost ratio rule or majority voting rule.

Abderraouf Dribek - One of the best experts on this subject based on the ideXlab platform.

  • Contingent valuation analysis of willingness to pay for Beach Erosion control through the stabiplage technique: A study in Djerba (Tunisia)
    Marine Policy, 2017
    Co-Authors: Abderraouf Dribek, Louinord Voltaire
    Abstract:

    Beach Erosion can have major economic implications because of the potential impact on coastal recreation demand – particularly for countries where coastal tourism is one of the main sources of external revenue. Djerba Island (Tunisia) falls in that category. With about 125 km of coastline, Djerba Island is one of the most important Tunisian destinations. However, the island is experiencing coastal Erosion problems. The Tunisia government launched a project to fight costal Erosion through the Stabiplage technique. This study provides the first economic valuation of Beach Erosion control in Tunisia and is the first one that focuses on the Stabiplage technique. Specifically, a contingent valuation survey is carried out to elicit the public willingness to pay (WTP) for the project. An interval payment card question format is used to obtain information about WTP from representative samples of residents and tourists in Djerba. The results reveal a positive WTP for the project. Aggregate WTP estimates range from €133,459 (median value) to €5,180,269 (mean value). These values can help inform decisions about whether to undertake the project based on either the benefit-cost ratio rule or majority voting

  • contingent valuation analysis of willingness to pay for Beach Erosion control through the stabiplage technique a study in djerba tunisia
    Marine Policy, 2017
    Co-Authors: Abderraouf Dribek, Louinord Voltaire
    Abstract:

    Abstract Beach Erosion can have major economic implications because of the potential impact on coastal recreation demand – particularly for countries where coastal tourism is one of the main sources of external revenue. Djerba Island (Tunisia) falls in that category. With about 125 km of coastline, Djerba Island is one of the most important Tunisian destinations. However, the island is experiencing coastal Erosion problems. The Tunisia government launched a project to fight costal Erosion through the Stabiplage technique. This study provides the first economic valuation of Beach Erosion control in Tunisia and is the first one that focuses on the Stabiplage technique. Specifically, a contingent valuation survey is carried out to elicit the public willingness to pay (WTP) for the project. An interval payment card question format is used to obtain information about WTP from representative samples of residents and tourists in Djerba. The results reveal a positive WTP for the project. Aggregate WTP estimates range from €133,459 (median value) to €5,180,269 (mean value). These values can help inform decisions about whether to undertake the project based on either the benefit-cost ratio rule or majority voting rule.

Takaaki Uda - One of the best experts on this subject based on the ideXlab platform.

  • Beach Erosion Triggered by Spatial Imbalance of Longshore Sand Transport in Phan Thiet, Vietnam
    APAC 2019, 2019
    Co-Authors: Yasuhito Noshi, Takaaki Uda, Ayami Date, L. T. K. Thoa, Akio Kobayashi
    Abstract:

    In developing countries including Vietnam with rapid economic growth, the Beach Erosion has become severe. Various artificial facilities for economic development have been rapidly constructed on coasts, and once Erosion occurs, stop-gap measures against Erosion have been widely taken, resulting in further downcoast Erosion. In this study, Beach Erosion was investigated by comparing aerial photographs and actual field observations on October 23, 2016 with those on November 9, 2017, taking Beach changes in Phan Thiet as an example. The Erosion mechanism in this area was studied on the basis of these field data.

  • Beach Erosion on golden Beach in south Taiwan
    Coastal Engineering Proceedings, 2018
    Co-Authors: Chun-hung Pao, Takaaki Uda, Yu-hsiang Lin, Jia-lin Julie Chen
    Abstract:

    Golden Beach in Taiwan is a sandy Beach attracting many Beachgoers because of its wide sandy Beach and beautiful sunset. In recent years, this Beach has been eroded. The cause of the Beach Erosion is considered to be due to the wave-sheltering effect of the Anping Harbor breakwaters constructed 4 km north of the Beach. Now the restoration of sandy Beach is underway by the construction of groins as well as Beach nourishment using sand procured from the downcoast deposition area. This study aims to investigate the cause of the Beach Erosion of this Beach to work out the effective measures against Beach Erosion.

  • Essential Aspects of Beach Erosion - Lessons from Devastation of Ichinomiya Coast, Japan☆
    Procedia Engineering, 2015
    Co-Authors: Satoquo Seino, Takaaki Uda, Yasuro Ohtani, Yasuhiro Ohki
    Abstract:

    Abstract The fundamental issues of the Beach Erosion including the difficulty in social and comprehensive adjustments of the Beach Erosion were discussed through a case study, taking the Ichinomiya coast on south Kujukuri Beach as an example. On this coast, sand supply from the sea cliffs markedly decreased as a result of the preventive measures against cliff Erosion on upcoast, resulting in the downcoast Erosion. Artificial headlands have been constructed since the 1990 as a measure against shoreline recession, but this caused further downcoast expansion of the Beach Erosion. Finally, it became difficult to escape from a vicious cycle of seawall construction - downcoast Erosion - seawall construction - downcoast Erosion, permitting further expansion of the Erosion area. Such difficulties were analyzed.

  • Beach Erosion Arising from Artificial Land Modification
    Journal of Disaster Research, 2007
    Co-Authors: Takaaki Uda
    Abstract:

    The cause of Beach Erosion in Japan is classified into seven types. Of these, examples associated with the formation of wave-shelter zones and decreased fluvial sediment supply were studied, typified by changes in Beaches at the Shimobara fishing port and along the Enshu-nada coast caused by decreased fluvial sediment supply from the Tenryu River. Such Erosion is closely related to land management and the "sector-by-sector" system in Japan. The prevention of Beach Erosion thus requires both scientific research and improvement in coastal management through enhancing the public consensus.

  • INVESTIGATION OF CAUSES OF Beach Erosion ON SOUTHERN ISHIKAWA COAST BASED ON HISTORY OF LOCAL AREA
    PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEAN, 2001
    Co-Authors: Takaaki Uda, Hideto Hirota, Toshiro San-nami
    Abstract:

    Causes of Beach Erosion on the southern Ishikawa coast facing the Sea of Japan was investigated based on the history of local area. In this area, the shoreline has been retreating, and in the previous studies the cause was said to be due to the offshore sand movement. However, in this area sand mining has been extensively carried out at and around the shoreline as well as dredging at two river mouths, where river mouth closure was severe. Thus, artificial causes cannot be ignored as the causes of Beach Erosion.

Kristen Labonte - One of the best experts on this subject based on the ideXlab platform.

David P. Callaghan - One of the best experts on this subject based on the ideXlab platform.

  • Including longshore transport within a probabilistic Beach Erosion model
    2017
    Co-Authors: Katrina Smith, Bronte Martin, David P. Callaghan
    Abstract:

    The NSW coastline has several identified Erosion hot spots (e.g., Old Bar, Wooli) where chronic and episodic Beach Erosion has the potential to damage properties and infrastructure. To enable better risk assessment from Beach Erosion, a new model is developed that combines probabilistic wave forcing (storms and non-storm conditions) with parametric cross-shore Erosion (following Kriebel and Dean, 1993) and continuity based longshore transport model using CERC equation. The new aspect here is in combining probabilistic aspects (a maturing technique) with well-established cross and long-shore Beach Erosion methods. These two aspects were combined, with open source computing in mind, using the capacity rich environment of MATLAB. The various array of complex coding and computing required to implement the Joint probability method of Callaghan et al (2008) in FORTRAN was replaced with built-in function calls within MATLAB. That is, replacing 3238 lines of FORTRAN code with 361 lines of MATLAB code. Thus providing future users with an easy to modified implementation. For example, switching from the Generalised Pareto to Gamma distribution would require changing distribution fitting and simulating function calls (gpfit to gamfit and gpcdf to gamcdf). The Beach Erosion model was also implemented in MATLAB using 174 lines of code. The small coastal community of Wooli, located on the Clarence coast of northern New South Wales, which is currently under threat from severe Beach Erosion was used to demonstrate this new model. The model was able to reproduce the observed existing chronic Erosion and when combined with bootstrapping, provide non-stationary shoreline position probabilities that combined chronic and episodic Beach Erosion. This model currently takes a few hours on a high performance computer to run but can easily be calculated using a desktop computer across a few days.

  • An evaluation of methods available for quantifying extreme Beach Erosion
    Journal of Ocean Engineering and Marine Energy, 2014
    Co-Authors: Douglas Pender, David P. Callaghan, Harshinie Karunarathna
    Abstract:

    To allow for effective and sustainable coastal management and planning it is important to have the tools available to estimate extreme Beach Erosion levels. This paper, therefore, presents an evaluation of methods available for quantifying extreme Beach Erosion. Previous common practice is the use of a single benchmark (1 in \(N\) year) event to estimate the corresponding extreme Erosion level. The limitations of this approach led to the development of more sophisticated temporal simulation frameworks providing robust statistical quantification of extreme Beach Erosion. These developments have resulted in a number of follow on studies to progress the methodology in line with a range of coastal morphodynamic modelling approaches. The discussion presented here, begins with basic empirical techniques and progresses up to those conducted using the most up-to-date morphodynamic models. Each methodology is applied to Narrabeen Beach, NSW, Australia, to compare and assess their suitability. The development of these methodologies is a relatively new topic, meaning that there is much scope for further progression. Although the use of state-of-the-art morphodynamic models is shown to give a good representation of Erosion volumes, their impracticalities seem to outweigh the benefits. Incorporation of more realistic estimations of the storm and wave climate and the requirement for global evaluation are identified as central to further development.

  • The impact of various methods of wave transfers from deep water to nearshore when determining extreme Beach Erosion
    Coastal Engineering, 2013
    Co-Authors: David P. Callaghan, David Wainwright
    Abstract:

    Abstract Several levels of increasing complexity of transferring wave information from offshore to nearshore have been studied to quantify their influence on extreme Beach Erosion estimates. Beach profiles which have been monitored since 1976 were used to estimate extreme Beach Erosion and compared to predictions. Examination of the wave propagation assumptions revolves around two types of offshore to nearshore transfer: excluding or including wave breaking and bottom friction. A second complication is whether still water level variations (ocean tide plus storm surge) are included. The inclusion of various combinations of wave propagation processes other than shoaling and refraction in the wave transfer function changes on the extreme Erosion distribution tail through lowering estimates above one year return period. This brings the predicted tails closer to the observations, but does not capture the upper limit of storm demand implied by the extensive Beach profile data set. Including wave breaking has a marked effect on probabilistic estimates of Beach Erosion. The inclusion of bottom friction is less significant. The inclusion of still water level variability in the wave transfer calculation had minimal impact on results for the case study site, where waves were transferred from offshore to water at 20 m depth. These changes were put into perspective by comparing them to changes resulting from limiting Beach Erosion by adjusting the statistical distributions of peak wave height and storm duration to have maximum limits. We conclude that the proposed improvements on wave transformation methods are as significant as limiting wave Erosion potential and worth including.

  • Statistical simulation of wave climate and extreme Beach Erosion
    Coastal Engineering, 2008
    Co-Authors: David P. Callaghan, Peter Nielsen, Andrew D. Short, Rwmrjb Ranasinghe
    Abstract:

    Abstract Recent developments in extreme values modelling have been used to develop a framework for determining the coastal Erosion hazard on sandy coastlines. This framework quantitatively reproduced the extreme Beach Erosion volumes obtained from field measurements at Narrabeen Beach, Australia. This encouraging finding was achieved using Kriebel and Dean's [Kriebel, D.L. and Dean, R.G., 1993. Convolution method for time-dependent Beach profile response. Journal of Waterway, Port, Coastal and Ocean Engineering, 119(2): 204–226.] simple Beach Erosion and accretion model. The method includes allowances for joint probability between all basic Erosion variates including; wave height, period and direction, event duration, tidal anomalies and event spacing. A new formulation for the dependency between wave height and period has been developed. It includes the physical wave steepness limitation. Event grouping, where significantly more Erosion can occur from two closely spaced storms is handled by temporally simulating the synthetic wave climate and the resulting Beach Erosion and accretion.

  • Estimating extreme Beach Erosion frequency from a Monte Carlo simulation of wave climate
    Journal of Coastal Research, 2007
    Co-Authors: David P. Callaghan, Peter Nielsen, Roshanka Ranasinghe
    Abstract:

    CALLAGHAN, D. P., NIELSEN, P. and RANASINGHE, R., 2007. Estimating extreme Beach Erosion frequency from a Monte Carlo simulation of wave climate. Journal of Coastal Research, SI 50 (Proceedings of the 9th International Coastal Symposium), 88 - 92. Gold Coast, Australia, ISSN 0749.0208