Coastal Problems

Viles, Heather; Spencer, Tom

doi:10.4324/9781315832586

Cited by 17 publications

(3 citation statements)

References 173 publications

(222 reference statements)

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“…La complejidad de la erosión litoral ha sido tratada en numerosos estudios (Bird, 1985(Bird, , 1994Viles y Spencer, 1995;Williams et al, 1995), en los cuales se enfatizan las interrelaciones estrechas entre los procesos naturales (climáticos, oceanográficos, biológicos y geológicos) y las intervenciones antrópicas, en muchos casos actuando conjuntamente. En relación con el área de estudio, el muy poco conocimiento que se tiene de los factores oceanográficos y climáticos (en cuanto a controles de los aportes de sedimentos a la franja litoral y de los mecanismos, volúmenes y direcciones de transporte) impide por el momento cualquier evaluación profunda del problema.…”

Section: Discussionunclassified

Introducción Al Problema De La Erosión Litoral en Urabá (Sector Arboletes- Turbo) Costa Caribe Colombiana

Corrêa¹,

Vernette²

2016

BIM

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Shoreline retreat has been the net dominant historical trend along the 145 km-length littoral between Arboletes and Turbo (Southern Caribbean of Colombia). For the last four decades, there were identified in this littoral shoreline retreats of about 50-100m in several places (Uveros, Damaquiel, Zapata, Turbo) and a maximun of 1.6 km in the Punta Rey-Arboletes area, where land losses were of 4.5 k m2, at exceptional rates of 40m/year. The synthesis of the available information suggest that the general “susceptibility” to erosion between Arboletes and Turbo could be related primarily to relative sea level rise, associated to tectonic movements as well as to the effects of mud diapirism and hydroisostacy. In the more critical areas (Arboletes, Turbo), the natural erosive trends were accelerated by anthropic actions, including river diversion (Turbo), beach mining, and inadequate (or total absense) practices for controlling residual and natural waters. Up to August 2000, there were invested about $ Col 10.000 billions in 155 engineering defences (groins, sea walls and rip-rap which totalize 6.2 km of total length and a volume of materials of 37.000 m3). With few exceptions, groins have not been successful and are now part of the problem, accelerating shore erosion along the adyacent sectors. In the short term, the littoral erosion between Arboletes and Turbo is caused both by marine and by subaerial factors. It is facilitated by the poor lithological strengths of cliffs and marine terraces, mainly composed of highly fractured and weathered claystones and mudstones (with stratification and weakeness planes dipping toward sea) and nonconsolidated, easily liquefacted, fine sediments; both conditions facilitate the occurrence of rocks falls, slides and mud flows that result in high figures of cliff retreat (3 to 4m), specially during the first 15 days of the summer-winter transition (april) and in high waves periods. The case of the littoral erosion between Arboletes and Turbo illustrates well how the natural erosive trends of an area can be accelerated by human interventions and the urgent need for coordinating efforts to cope with littoral land losses.

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Section: Discussionunclassified

Introducción Al Problema De La Erosión Litoral en Urabá (Sector Arboletes- Turbo) Costa Caribe Colombiana

Corrêa¹,

Vernette²

2016

BIM

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“…The model parameters were identified and selected through an in-depth review of relevant literature (Viles and Spencer, 1995;Barua, 1997;Krantz, 1999;Ali, 1999;Mikhailov and Dotsenko 2007;Parvin et al, 2008;Masatomo, 2009;Rabbani et al, 2010;Hossain, 2012;Chowdhury, 2013;Brammer, 2014) available for the study area. However, relevant literature (Umitsu, 1997;Ahmed, 1999;Ali, 1999;Huq et al, 1999;Krantz, 1999;RRCAP, 2001;Islam, 2006;Karim and Mimura, 2006;Palinkas et al, 2006;Ali et al, 2007;Mikhailov and Dotsenko 2007;Shamsuddoha and Chowdhury, 2007;Sokolewiczand-Louters, 2007;Unnikrishnan and Shankar, 2007;Bird, 2008;Islam, 2008;Parvin et al, 2008;Masatomo, 2009;Rabbani et al, 2010;SDC, 2010;Sarker et al, 2011;Hossain, 2012;Khan, 2012;Smith, 2012;Taguchi et al, 2013;Brammer, 2014;Islam et al, 2016) was consulted to justify the influence and interrelationships of the model parameters on land susceptibility to erosion in the coastal area.…”

Section: Model Parametersmentioning

confidence: 99%

Modelling land susceptibility to erosion in the coastal area of Bangladesh: A geospatial approach

et al. 2018

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This research aimed to develop a widely applicable raster GIS-based model for analysing susceptibility of coastal lands to erosion. The model, Land Susceptibility to Coastal Erosion (LSCE), was applied for the coastal area of Bangladesh as a case study. This study included three coastal zones (western, central and eastern) that cover the entire coastal area of the country. The outputs of the model comprised physical susceptibility of the coastal lands to erosion according to five susceptibility classes. The overall results demonstrate that out of the entire coastal area about 0.59 % (266.32 km²) and 0.02 % (10.01 km²) of the coastal lands exhibit high and very high susceptibility to erosion, respectively. These make 276.33 km² in total as being highly susceptible to erosion, which is noteworthy for the densely populated coastal area of the country. The remaining 5.49 %, 20.56 % and 73.34 % of lands were identified as having moderate, low and very low susceptibility to erosion, respectively. The developed model is highly suitable for addressing the impacts of hydro-climatic parameters on susceptibility to coastal erosion. Hence, this study identified and mapped the influence of hydro-climatic parameters on the coast by assessing seasonal variations of susceptibility to erosion. The outputs were then validated by developing an inventory map and analysing the independent historical observations by using 'degree of fit' curves. The LSCE model could be useful for coastal researchers in assessing erosion susceptibility of dynamic coastal lands around the world.

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“…Mechanisms responsible for this landward sediment transport include tidal inlets, temporary inlets cut by storms, overwash of sand during storms, and aeolian transport (Boothroyd et al, 1985;Leatherman, 1985). The importance of overwash is increased as sea-level rise accelerates because transgressions typically lead to more frequent overwash events (Viles and Spencer, 1995). Different locations along the coast are influenced by unique combinations of sea-level rise rates, tidal range, storm tracks, wind and wave regimes, and sediment supply such that the dominant mechanism of barrier retreat is unique to each environment (Leatherman, 1985).…”

Section: Introductionmentioning

confidence: 99%

Quantifying overwash flux in barrier systems: An example from Martha's Vineyard, Massachusetts, USA

et al. 2013

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Coastal barriers are particularly susceptible to the predicted effects of accelerated of sea-level rise and the potential for increased impacts of intense storms. Over centennial scales, barriers are maintained via overtopping during storms, causing deposition of washover fans on their landward sides. This study examines three washover fans on the south shore of Martha's Vineyard using a suite of data including vibracores, ground penetrating radar, high resolution dGPS, and LiDAR data. From these data, the volumes of the deposits were determined and range from 2.1-2.4 x 10 4 M .Two overwashes occurred during Hurricane Bob in 1991. The water levels produced by this storm have a return interval of ~28 years, resulting in an onshore sediment flux of 2.4-3.4 m 3 /m/yr. The third washover was deposited by a nor'easter in January 1997, which has a water level return interval of ~6 years, resulting in a flux of 8.5 m 3 /m/yr. These fluxes are smaller than the flux of sediment needed to maintain a geometrically stable barrier estimated from shoreline retreat rates, suggesting that the barrier is not in long-term equilibrium, a result supported by the thinning of the barrier over this time interval.

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Coastal Problems

Cited by 17 publications

References 173 publications

Introducción Al Problema De La Erosión Litoral en Urabá (Sector Arboletes- Turbo) Costa Caribe Colombiana

Introducción Al Problema De La Erosión Litoral en Urabá (Sector Arboletes- Turbo) Costa Caribe Colombiana

Modelling land susceptibility to erosion in the coastal area of Bangladesh: A geospatial approach

Quantifying overwash flux in barrier systems: An example from Martha's Vineyard, Massachusetts, USA

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