Influence of ground ice and permafrost on coastal evolution, Richards Island, Beaufort Sea coast, N.W.T.

1996 ◽  
Vol 33 (5) ◽  
pp. 664-675 ◽  
Author(s):  
Scott R. Dallimore ◽  
Stephen A. Wolfe ◽  
Steven M. Solomon
Keyword(s):  
Coastal Erosion ◽  
Sediment Budget ◽  
Storm Event ◽  
Ground Ice ◽  
Coastal Evolution ◽  
Thermal Erosion ◽  
Ice Wedge ◽  
Mechanical Erosion ◽  
Sea Coast

A long-term sediment budget (1947−1985) for northern Richards Island shows that, when ground ice and offshore erosion are accounted for, there is a near balance between headland erosion and coastal deposition. Excess ice constitutes about 20% of the total volume of eroded material from the headlands, with massive ground ice contributing nearly 9% and segregated ice lenses and ice wedges making up the remainder. Coastal response to major storms in 1987 and 1993 suggests that erosion is episodic, with short periods of intense disruption followed by readjustment of cliff profiles. Processes characteristic of this environment include mechanical erosion of ice-bonded sediments creating unstable erosional niches, mechanical failure of niches along ice-wedge planes, and longer term thermal erosion of ice-bonded sediments. Where ice contents are high, localized thaw slumps initiated by coastal erosion may retreat at rates substantially higher than those observed at other sections of the coast. Cliff-top retreat rates may be out of phase with storm-event chronology.

West Sole Pipeline Stabilisation

2005 ◽  
Author(s):  
Z. Chen ◽  
Eamon Sheehan
Keyword(s):  
Negative Impact ◽  
Optimal Solution ◽  
Sediment Budget ◽  
Gas Field ◽  
Critical Position ◽  
Coastal Evolution ◽  
Sea Bed ◽  
Pipeline Failure ◽  
The Uk

The BP West Sole gas field is located in Block 48/6 in the UK sector of the southern North Sea, about 70 km off the Holderness coast. Production from the gas field is exported to a shore terminal at Easington by two pipelines. Both pipelines were trenched at installation. Pipeline surveys over the last few years show that both pipelines are substantially exposed at the shore approach and inshore sections. This has occurred in part due to the retreat of the cliffs in Easington and subsequent lowering of the sea bed level and also the migration of sand from around the pipelines leaving them largely unburied and sitting on the local clay abrasion platform. It has been concluded that both pipelines require stabilisation sooner rather than later to reduce the risk of pipeline failure. Pipeline stabilisation options need to take account of the environment in which they have been placed. Easington is at a critical position along the Holderness coast. All net sediment transport from the Holderness coastline passes through this section. Any interruption to this movement could result in a change to the adjacent coast. Maintenance of the sediment budget is important to a wider area of the East coast of England. Stabilisation options must not reduce the net amount of sediment moving southwards past Dimlington and must not result in any long term negative impact on the coastal evolution. This paper outlines consultancy required and problems process regarding the geomorphological issues in getting acceptance from government and non-government bodies. A methodology has been developed that allows quantification of impacts of different options on the sediment budget and on the long-term coastal evolution (see also Chen et al 1998, 2001 and 2002). Application of this method aimed at providing understanding and information which is considered to be important in the process of selecting an optimal solution for the pipeline stabilisation in such an environmental sensitive coast.

scholarly journals Estimation of Background Erosion Rate at Janghang Beach due to the Construction of Geum Estuary Tidal Barrier in Korea

2020 ◽  
Vol 8 (8) ◽  
pp. 551
Author(s):  
Sahong Lee ◽  
Jung Lyul Lee
Keyword(s):  
Coastal Erosion ◽  
Sediment Budget ◽  
Coastal Development ◽  
Coastal Sediment ◽  
Littoral Cell ◽  
Watershed Development ◽  
Open Sea ◽  
Sediment Loss ◽  
The Future

In this study, a reduction in sediment budget due to the development of a river watershed, resulting in coastal erosion, was reviewed, and the rate of background erosion was calculated through an examination of the loss of coastal sediment into the open sea. The west coast of the Korean peninsula is severely impacted by the intercept of inflowing sediments from rivers, owing to the watershed development. However, the effects have not fully propagated into the entire coastal area, and thus, the long-term coastal erosion remains insignificant. However, a serious and irrevocable disaster may occur once the coastal erosion begins. Therefore, an analysis of the coastal erosion resulting from changes in the sediment budget, due to the development of the watershed, was conducted on Janghang Songrim Beach. A littoral cell of the Geum River was selected for a quantitative analysis of the decrease in the sediment budget from the watershed development. The rate of coastal sediment loss offshore, which reflects the characteristics of the Janghang Songrim Beach, and the future rate of coastal erosion were calculated. Then, the results were verified by employing geometrically corrected satellite photographs from previous years. This will enable us to predict the time of coastal erosion in the future due to a reduction in the sediment budget and watershed development, and prepare for future disasters resulting from the coastal erosion. Based on research into the components constituting the coastal development, the present study presents theoretical formulae allowing the prediction of the sediment budget and providing a practical contribution to the prevention of coastal erosion, for which additional reliable studies need to be conducted.

scholarly journals Single Extreme Strong Sequence Can Offset Decades of Shoreline Retreat by Sea-level Rise

2021 ◽  
Author(s):  
Mitchell Harley ◽  
Gerd Masselink ◽  
Amaia Ruiz de Alegría-Arzaburu ◽  
Nieves Valiente ◽  
Tim Scott
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Coastal Erosion ◽  
Sediment Budget ◽  
Positive Contribution ◽  
Volume Changes ◽  
Shoreline Retreat ◽  
Quantitative Understanding ◽  
The Uk

Abstract Extreme storms cause extensive beach-dune erosion and are universally considered to enhance coastal erosion due to sea-level rise (SLR). However, extreme storms can also have a positive contribution to the nearshore sediment budget by exchanging sediment between the lower and upper shoreface and/or between adjacent headlands, potentially mitigating adverse SLR impacts. Here we use three high-resolution morphological datasets of extreme storm-recovery sequences from Australia, the UK and Mexico to quantify the nearshore sediment budget and relate these episodic volume changes to long-term coastal forecasts. We show that sediment gains over the upper shoreface and beach were very significant (58-140 m3/m) and sufficient to offset decades of predicted shoreline retreat due to SLR, even for an upper SSP5-8.5 scenario. It is evident that increased confidence in shoreline predictions due to SLR relies fundamentally on robust quantitative understanding of the sediment budget, in particular any long-term contribution of sediment transport from outside the nearshore region.

scholarly journals Future Changes in Wave Conditions at the German Baltic Sea Coast Based on a Hybrid Approach Using an Ensemble of Regional Climate Change Projections

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 167
Author(s):  
Norman Dreier ◽  
Edgar Nehlsen ◽  
Peter Fröhle ◽  
Diana Rechid ◽  
Laurens M. Bouwer ◽  
...  
Keyword(s):  
21St Century ◽  
Wind Wave ◽  
Regional Climate ◽  
Hybrid Approach ◽  
Wave Modelling ◽  
Long Term Changes ◽  
Mean Wave Period ◽  
Wave Conditions ◽  
Sea Coast

In this study, the projected future long-term changes of the local wave conditions at the German Baltic Sea coast over the course of the 21st century are analyzed and assessed with special focus on model agreement, statistical significance and ranges/spread of the results. An ensemble of new regional climate model (RCM) simulations with the RCM REMO for three RCP forcing scenarios was used as input data. The outstanding feature of the simulations is that the data are available with a high horizontal resolution and at hourly timesteps which is a high temporal resolution and beneficial for the wind–wave modelling. A new data interface between RCM output data and wind–wave modelling has been developed. Suitable spatial aggregation methods of the RCM wind data have been tested and used to generate input for the calculation of waves at quasi deep-water conditions and at a mean water level with a hybrid approach that enables the fast compilation of future long-term time series of significant wave height, mean wave period and direction for an ensemble of RCM data. Changes of the average wind and wave conditions have been found, with a majority of the changes occurring for the RCP8.5 forcing scenario and at the end of the 21st century. At westerly wind-exposed locations mainly increasing values of the wind speed, significant wave height and mean wave period have been noted. In contrast, at easterly wind-exposed locations, decreasing values are predominant. Regarding the changes of the mean wind and wave directions, westerly directions becoming more frequent. Additional research is needed regarding the long-term changes of extreme wave events, e.g., the choice of a best-fit extreme value distribution function and the spatial aggregation method of the wind data.

AD EXEMPLUM SUSTAINABLE ACCOMMODATION PRACTICES ON THE BULGARIAN BLACK SEA COAST

2020 ◽  
Author(s):  
Katina Popova ◽  
◽  
Miroslava Malcheva ◽  
Keyword(s):  
Sustainable Development ◽  
Foreign Exchange ◽  
Black Sea ◽  
Local Community ◽  
Economic Benefits ◽  
Poverty Eradication ◽  
The Sustainable Development ◽  
Black Sea Coast ◽  
Sea Coast

Tourism in Bulgaria is a cross cutting sector of particular importance for unemployment and poverty eradication. As a source of foreign exchange earnings and direct investments it ensures viable medium and long-term economic benefits for both the destination and the local community. In recent years, the sustainable development of tourism on the Bulgarian Black Sea coast is seriously threatened, mainly due to the consequences of mass sea tourism, the short-sighted use of available resources and the territorial concentration of accommodation facilities. The aim of the present study is to establish the achievements of the hospitality business on the Bulgarian Black Sea coast in terms of sustainability and environmentally friendly lifestyle.

Reconstructing the initial shape of volcanic islands to quantify long-term coastal erosion

2021 ◽  
Author(s):  
Rémi Bossis ◽  
Vincent Regard ◽  
Sébastien Carretier
Keyword(s):  
Coastal Erosion ◽  
Erosion Rate ◽  
Developed Countries ◽  
Global Scale ◽  
Radial Symmetry ◽  
Wave Direction ◽  
Initial Shape ◽  
Vertical Movements ◽  
Volcanic Islands

<p>The global solid flux from continent to ocean is usually reduced to the input of sediments from rivers, and is estimated at approximately 20 Gt/year. Another input of sediments to ocean is coastal erosion, but this flux is difficult to estimate on a global scale and it is often neglected, perhaps wrongly according to regional studies [1,2]. Most studies attempting to quantify coastal erosion have focused on the coasts of developed countries and are limited to the timescale of decades or less [3]. The difficulty in quantifying long-term coastal erosion is that there are still many uncertainties about the factors controlling coastal erosion on this time scale, and it would be necessary to know the initial geometry of coastlines to calculate an eroded volume.</p><p>Volcanic islands, as geomorphological objects, seem to be very good objects of study to remedy these limitations. Indeed, many young volcanic islands are made of only one central edifice with a strong radial symmetry despite its degradation by erosion [4,5]. By knowing the age of an island and by comparing reconstructed shape with current shape, we can calculate a total eroded volume and an integrated average coastal erosion rate on the age of the island. Moreover, due to their geographical, petrological and tectonic diversity, volcanic islands allow to compare the influence of different factors on long-term coastal erosion, such as climate, wave direction and height, rock resistance or vertical movements. Thus, we will be able to prioritize them to propose coastal erosion laws that would applicable to all rocky coasts.</p><p>Here we built on previous works that have used aerial geospatial databases to reconstruct the initial shape of these islands [6,7] but we improve this approach by using offshore topographic data to determine the maximum and initial extension of their coasts. From both onshore and offshore topographies, we determine a long-term mean coastal erosion rate and we quantify precisely its uncertainty. Using the example of Corvo Island, in the Azores archipelago, we show how our approach allows us to obtain first estimates of long-term coastal erosion rate around this island.</p><p> </p><p><strong>References</strong></p><p> </p><p>[1] Landemaine V. (2016). Ph.D. thesis, University of Rouen.</p><p>[2] Rachold V., Grigoriev M.N., Are F.E., Solomon S., Reimnitz E., Kassens H., Antonow M. (2000). International Journal of Earth Sciences, 89(3), 450-460.</p><p>[3] Prémaillon M. (2018). Ph.D. thesis, University of Toulouse.</p><p>[4] Karátson D., Favalli M., Tarquini S., Fornaciai A., Wörner G. (2010). Journal of Volcanology and Geothermal Research, 193, 171-181.</p><p>[5] Favalli M., Karátson D., Yepes J., NannipierI L. (2014). Geomorphology, 221, 139-149.</p><p>[6] Lahitte P., Samper A., Quidelleur X. (2012). Geomorphology, 136, 148-164.</p><p>[7] Karátson D., Yepes J., Favalli M., Rodríguez-Peces M.J., Fornaciai A. (2016). Geomorphology, 253, 123-134.</p>

scholarly journals COASTAL CHANGES AT BETHANY BEACH, DELAWARE

1984 ◽  
Vol 1 (19) ◽  
pp. 112 ◽  
Author(s):  
Jennifer E. Dick ◽  
Robert A. Dalrymple
Keyword(s):  
Coastal Erosion ◽  
Coastal Processes ◽  
Short Term ◽  
Winter Storms ◽  
Barrier Beach ◽  
Commercial Activities ◽  
Long Term Trends ◽  
Coastal Changes ◽  
Summer Homes

The coastal processes affecting Bethany Beach, Delaware were studied and the short-term and long-term trends in coastal changes were determined in order to develop recommendations for protecting Bethany against coastal erosion (Dick and Dalrymple, 1983). Bethany Beach is located on the Delaware Atlantic coastline which is a wide sandy baymouth barrier beach distinguished by highlands at Rehoboth Beach and Bethany Beach. The shoreline is straight, with only minor bulges and indentations (see Figure 1). Bethany Beach is a residential and resort community. Privatelyowned properties front the publicly-owned beach. Construction of new motels and summer homes is anticipated along with the continued growth of commercial activities to accommodate the increased number of visitors. Bethany is protected by a series of nine groins built between 1934 and 1945. Many of these groins have deteriorated, and are flanked at the landward end. Winter storms severely erode the beach and damage shorefront property. The beach is generally narrow (approximately 45 m wide), especially along the southern portion, and is backed by low dunes (about 15-45 m above NGVD). A timber bulkhead extends along most of the backshore.

scholarly journals Erosion assessment in the middle Kali Gandaki (Nepal): A sediment budget approach

2013 ◽  
Vol 46 ◽  
Author(s):  
Monique Fort ◽  
Etienne Cossart
Keyword(s):  
Drainage Basin ◽  
Sediment Budget ◽  
Mountain Range ◽  
Primary Concern ◽  
Stream Power ◽  
Sediment Budgets ◽  
Relative Chronology ◽  
Wide Range ◽  
History Of

Active mountains supply the largest sediment fluxes experienced on earth. At mountain range scale, remote sensing approaches, sediments provenance or stream power law analyses, collectively provide rough long-term estimates of total erosion. Erosion is indeed controlled by rock uplift and climate, hence by a wide range of processes (detachment, transport and deposition), all operating within drainage basin units, yet with time and spatial patterns that are quite complex at local scale. We focus on the Kali Gandaki valley, along the gorge section across the Higher Himalaya (e.g. from Kagbeni down to Tatopani). Along this reach, we identify sediment sources, stores and sinks, and consider hillslope int eractions with valley floor, in particular valley damming at short and longer time scales, and their impact on sediment budgets and fluxes. A detailed sediment budget is presented, constrained by available dates and/or relative chronology, ranging from several 10 kyr to a few decades. Obtained results span over two orders of magnitude that can best be explained by the type and magnitude of erosional processes involved. We show that if large landslides contribute significantly to the denudation history of active mountain range, more frequent medium to small scales landslides are in fact of primary concern for Himalayan population.

scholarly journals Technical Considerations on the Management of Coastal Areas Rehabilitation Projects

2021 ◽  
Vol 343 ◽  
pp. 07008
Author(s):  
Georgiana Grigoras ◽  
Ionuţ Cristian Mihalache ◽  
Eduard Edelhauser
Keyword(s):  
Coastal Area ◽  
Coastal Erosion ◽  
Monitoring Program ◽  
Natural Process ◽  
Close Monitoring ◽  
The World ◽  
Economic Infrastructure ◽  
Marine Wildlife ◽  
Technical Considerations

Coastal erosion contributes to the loss of particularly valuable land, which can damage coastal ecosystems and cause economic and social damage to the area where they occur. Coastal erosion is a natural process that affects shores around the world. The article present aspects of coastal erosion in Romania as well as some solutions proposed to reduce this phenomenon. Submerged structures are exposed to erosion therefore a close monitoring is necessary. A malfunction will result in the damage of the structure as well as endangering marine wildlife. The proposed solutions are meant to protect the coastal area against erosion, protecting the shore, adjacent land and ecosystems. These solutions will also protect the economic infrastructure and social objectives endangered by marine erosion. A monitoring program will be implemented for a medium and long term, supporting the maintenance operations.

scholarly journals GUIA METODOLOGICA PARA UN MANEJO INTEGRAL COSTERO APLICADO A PEHUEN CO (ARGENTINA)

2017 ◽  
Vol 2 (6) ◽  
pp. 96
Author(s):  
María Luján Bustos
Keyword(s):  
Coastal Management ◽  
Coastal Erosion ◽  
Buenos Aires ◽  
Environmental Indicators ◽  
Decision Makers ◽  
Fundamental Issue ◽  
Integrated Coastal Management ◽  
Coastal Cities ◽  
Different Time Scales

Los planes de manejo integral costero (MIC) en Argentina son casi inexistentes. Al sur de la provincia de Buenos Aires (Argentina) es necesaria una planificación debido a la intensidad de la erosión costera que afecta en especial las zonas urbanizadas. Es necesario el trazado de estrategias de MIC que se puedan aplicar en toda la zona de forma sostenible. En este proceso es fundamental la participación y compromiso de los actores sociales. Por este motivo se construye una guía metodológica para un MIC con la participación social y se aplica a la localidad de Pehuen Co. Se obtuvo que la erosión costera y la estacionalidad turística son los ejes fundamentales, tanto para la visión científica como para la social. Sobre estos se delinearon acciones y estrategias a corto, medio y largo plazo e indicadores de seguimiento. Es necesario el compromiso de las autoridades locales, en trabajo conjunto con los actores sociales, para el correcto funcionamiento de los MIC.Palabras clave: Manejo Integral Costero; Indicadores Ambientales; Erosión; Estacionalidad Turística, Pehuen Co (Argentina).METHODOLOGICAL GUIDE FOR COASTAL MANAGEMENT INTEGRAL APPLIED TO PEHUEN CO (ARGENTINA)ABSTRACTThe integrated coastal managements (ICM) in Argentina are limited. To the south of the province of Buenos Aires (Argentina) is necessary the incorporation of planning activities due to the coastal erosion is increasing. This process affect especially coastal cities. For these reason, is necessary to carry out ICM strategies that can be applied throughout the area. In order to do this, the stakeholder's perception was consider as a fundamental issue. In this context, a methodological ICM was built considering the stakeholders participation. The study area was Pehuen Co, Buenos Aires (Argentina). As a results, it was obtained that coastal erosion and tourism seasonality are the main activities to guide the ICM in this town. As a consequence, strategies in different time scales (short, medium and long term) and monitoring indicators were made. As a conclusion, the sustainability of the ICM is only possible if stakeholder and decision makers work together.Keywords: Integrated Coastal Management; Environmental Indicators; Erosion; Tourism Seasonality; Pehuen Co (Argentina).GUIA METODOLÓGICO PARA A GESTÃO COSTEIRA INTEGRAL APLICADA À PEHUÉN CO (ARGENTINA) RESUMOOs planos de gestão costeira integrada (GCI) na Argentina são quase inexistentes. No Sul da província de Buenos Aires (Argentina), o planejamento por causa da intensidade da erosão costeira, que afeta especialmente as áreas urbanizadas, é necessário. É fundamental ainda traçar estratégias de GCI que possam ser aplicadas em toda a área de forma sustentável. Neste processo, a participação e o compromisso dos atores sociais são fundamentais. Por esta razão, um guia metodológico foi construído para uma GCI com participação social e aplica-se à localidade de Pehuen Co. Obteve-se como resultado que a erosão costeira e a sazonalidade do turismo são os pilares tanto para a visão científica quanto para a social. Sobre isso, foram delineadas ações e estratégias a curto, médio e longo prazos e indicadores de acompanhamento. Concluiu-se que é necessário o compromisso das autoridades locais, trabalhando em conjunto com as partes interessadas, para o bom funcionamento do GCI.Palavras-chave: Gestão Integrada Costeira; Indicadores Ambientais; Erosão; Sazonalidade do Turismo; Pehuen Co (Argentina).

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