Kuwait Coastline Evolution during 1989–2007

2011 ◽  
pp. 101-118 ◽  
Keyword(s):  
Coastline Evolution

scholarly journals Complex coastlines responding to climate change: do shoreline shapes reflect present forcing or "remember" the distant past?

2016 ◽  
Author(s):  
Christopher W. Thomas ◽  
A. Brad Murray ◽  
Andrew D. Ashton ◽  
Martin D. Hurst ◽  
Andrew K. A. P. Barkwith ◽  
...  
Keyword(s):  
Climate Change ◽  
Wave Climate ◽  
Quasi Equilibrium ◽  
Morphological Response ◽  
Antecedent Conditions ◽  
Coastline Evolution ◽  
Aspect Ratios ◽  
Order Of Magnitude ◽  
Offshore Wave ◽  
Hysteresis Behaviour

Abstract. A range of planform morphologies emerge along sandy coastlines as a function of offshore wave climate. It has been implicitly assumed that the morphological response time is rapid compared to the time scales of wave-climate change, meaning that coastal morphologies simply reflect the extant wave climate. This assumption has been explored by focussing on the response of two distinctive morphological coastlines – flying spits and cuspate cusps – to changing wave climates, using a coastline evolution model. Results indicate that antecedent conditions are important in determining the evolution of morphologies, and that sandy coastlines can demonstrate hysteresis behaviour. In particular, antecedent morphology is particularly important in the evolution of flying spits, with characteristic timescales of morphological adjustment on the order of centuries for large spits. Characteristic timescales vary with the square of aspect ratios of capes and spits; for spits, these timescales are an order of magnitude longer than for capes (centuries vs. decades). When wave climates change more slowly than the relevant characteristic timescales, coastlines are able to adjust in a quasi-equilibrium manner. Our results have important implications for the management of sandy coastlines where decisions may be implicitly and incorrectly based on the assumption that present-day coastlines are in equilibrium with current conditions.

The Oxford Handbook of Prehistoric Oceania

2014 ◽  
Keyword(s):  
New Zealand ◽  
New Caledonia ◽  
New Guinea ◽  
Future Research ◽  
Research Directions ◽  
Settlement Systems ◽  
Coastline Evolution ◽  
Aotearoa New Zealand ◽  
Key Points ◽  
Future Research Directions

The prehistory of Oceania begins with the occupation of New Guinea over 50,000 years ago, up to the settlement of Aotearoa/New Zealand in the last 700 years. The Oxford Handbook of Prehistoric Oceania presents this history in regional overviews and debates through 21 chapters by leading archaeologists and scholars of allied fields. Chapters present the latest findings and future research directions on the New Guinea region and archipelagos from Vanuatu, New Caledonia, Fiji, Tonga, and Samoa in the western Pacific. Micronesia, East Polynesia, Hawaii, Aotearoa/New Zealand, and Easter Island are also discussed in individual chapters. Chapters on wider disciplinary issues summarize key points of method and theory in Oceanic archaeology, including the generation of explanations, building chronologies, linguistic prehistory, coastline evolution, settlement systems, and maritime migration.

scholarly journals Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach

2016 ◽  
Author(s):  
Cristina Ponte Lira ◽  
Ana Nobre Silva ◽  
Rui Taborda ◽  
Cesar Freire de Andrade
Keyword(s):  
Coastal Management ◽  
Holistic Approach ◽  
Integrated Approach ◽  
Beach Erosion ◽  
Science Data ◽  
Coastal System ◽  
Dune Systems ◽  
Management Actions ◽  
Coastline Evolution

Abstract. Regional/global-scale information on coastline rates of change and trends is extremely valuable, but national-scale studies are scarce. A widely accepted standardized methodology for analysing long-term coastline change has been difficult to achieve, but is essential to conduct an integrated and holistic approach to coastline evolution and hence support coastal management actions. Additionally, databases providing knowledge on coastline evolution are of key importance to support both coastal management experts and users. The main objective of this work is to present the first systematic, global and consistent long-term coastline evolution data of Portuguese mainland low-lying sandy. The methodology used quantifies coastline evolution using an unique and robust coastline indicator (the foredune toe), which is independent of short-term changes. The dataset presented comprises: 1) two polyline sets, mapping the 1958 and 2010 sandy beach-dune systems coastline, both optimized for working at 1:50 000 scale or smaller, and 2) one polyline set representing long-term change rates between 1958 and 2010, estimated at each 250 m. The science data produced here are in Open Access at doi:10.1594/PANGAEA.853654 and can be used in other studies. Results show beach erosion as the dominant trend, with a mean change rate of −0.24 ± 0.01 m/year for all mainland Portuguese beach-dune systems. Although erosion is dominant, this evolution is variable in signal and magnitude in different coastal sediment cell and also within each cell. The most relevant beach erosion issues were found in the coastal stretches of Espinho – Torreira and Costa Nova – Praia da Mira, both at sub-cell 1b; Cova Gala – Leirosa, at sub-cell 1c and Cova do Vapor – Costa da Caparica, at cell 4. Cells 1 and 4 exhibit a history of major human interventions interfering with the coastal system, many of which originated and maintained a sediment deficit. In contrast, cells 5 and 6 have been less intervened and show stable or moderate accretion behaviour.

scholarly journals Géomatique appliquée à la géomorphologie littorale : Contribution à la connaissance théorique des techniques d’analyse spatiale de l’évolution du linéaire côtier

2021 ◽  
Vol 17 (28) ◽  
pp. 101
Author(s):  
Mamadou Thior
Keyword(s):  
Remote Sensing ◽  
Statistical Approach ◽  
Digital Processing ◽  
Remote Sensing And Gis ◽  
Aerial Images ◽  
Coastline Evolution ◽  
Système D’Information ◽  
The Subject ◽  
Methodological Approaches ◽  
Definition Of

L’analyse de l’évolution du trait de côte en cinématique du littoral exige tout d’abord le choix d’un indicateur linéaire. En effet, il existe plus d’une douzaine de lignes de référence matérialisant la position du trait de côte. Cette diversité d’indicateurs induit la recherche et la mise au point de nombreuses méthodes pour détecter, extraire et suivre la mobilité du trait de côte. Ces approches méthodologiques reposent sur la compilation et la comparaison de données acquises, soit sur le terrain par des instruments de topométrie (niveau de chantier, théodolite, tachéomètre électronique, lidar, récepteur DGPS, etc.), soit en laboratoire par le traitement numérique d’images satellites ou aériennes. Le but de ce travail est de contribuer à une meilleure connaissance de l’approche cartographique et statistique qui permet de calculer les taux de variation historique du trait de côte à travers les outils la géomatique: Télédétéction et Système d’Information Géographique (SIG). La technique faisant l’objet d’étude dans cette approche est une méthode statistique d’extrapolation et de calcul de tendances basée sur le traitement des images géospatiales. Dans un cadre théorique, le sujet discute la définition de la ligne de référence, du protocole méthodologique de son extraction et de la cartographie de l’évolution du trait de côte du littoral.   The analysis of coastline evolution in coastal kinematics requires first of all the choice of a linear indicator. Indeed, there are more than a dozen reference lines materializing the position of the coastline. This diversity of indicators leads to the research and development of numerous methods to detect, extract and monitor coastline mobility. These methodological approaches are based on the compilation and comparison of data acquired either in the field by topometry instruments (site level, theodolite, electronic tacheometer, lidar, DGPS receiver, etc.) or in the laboratory by digital processing of satellite or aerial images. The aim of this work is to contribute to a better knowledge of the cartographic and statistical approach that allows the calculation of historical coastline variation rates through geomatics tools: Remote sensing and GIS. The technique studied in this approach is a statistical method of extrapolation and calculation of trends based on the processing of geospatial images. In a theoretical framework, the subject discusses the definition of the reference line, the methodological protocol of its extraction and the mapping of the coastline evolution.

scholarly journals NORTH JETTY COASTLINE EVOLUTION AND SHORELINE ENGINEERING, GRAYS HARBOR, WASHINGTON

2018 ◽  
pp. 84
Author(s):  
Aaron Porter ◽  
Vladimir Shepsis ◽  
George Kaminsky ◽  
David Michalsen
Keyword(s):  
Sediment Transport ◽  
Sandy Beach ◽  
Transport Processes ◽  
Shoreline Erosion ◽  
Natural Sediment ◽  
Erosion Processes ◽  
The North ◽  
Coastline Evolution ◽  
Navigation Channel ◽  
The City

This study was initiated by the Port of Grays Harbor and the City of Ocean Shores, WA to address ongoing shoreline erosion processes, and sedimentation at the Grays Harbor Federal Navigation Channel. The North Jetty at the entrance to Grays Harbor Estuary, WA was constructed at the beginning of last century (1907) and resulted in major regional changes to the coastline. During the first 40 years post-construction of the jetty, approximately ten miles of sandy beach shoreline, two miles wide north of the jetty, was created by natural sediment transport processes. The accreted land was the base for the creation of the City of Ocean Shores. Since that time the shoreline has been periodically altered by extreme erosion events.

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