MONITORING THE DYNAMICS OF THERMOABRASION COASTS AT KHARASAVEY AREA, WESTERN YAMAL (KARA SEA)

2017 ◽  
Author(s):  
Dmitry Kuznetsov ◽  
Dmitry Kuznetsov ◽  
Anatoliy Kamalov ◽  
Anatoliy Kamalov ◽  
Nataliya Belova ◽  
...  
Keyword(s):  
Human Impact ◽  
Remote Sensing Data ◽  
Kara Sea ◽  
Motor Vehicles ◽  
Yamal Peninsula ◽  
Western Coast ◽  
Frozen Ground ◽  
Coastal Dynamics ◽  
The North ◽  
Ice Content

The dynamics of thermoabrasion coasts on loose sediments under permafrost conditions are highly variable due to several factors: length of the dynamic period of the year, mechanic composition of the frozen ground and its ice content, hydrometeorological conditions, and human impact. Multiannual monitoring of the coastal zone was carried out by Lab. Geoecology of the North (Moscow State University) at the 22 km long Kharasavey deposit site, Western Coast of Yamal Peninsula (Kara Sea). The methods include direct measurements and observations (repeated topographic survey of shore transects from 1981 to 2012) along with remote sensing data analysis (images from 1964 to 2011). This allowed producing detailed characteristics of coastal dynamics. At the site, thermoabrasion coasts occupy the most part, and accumulative coasts are present in the north. Data on natural relief forming factors and ground composition are included in the detailed geomorphologic map of the site. Shore retreat rate shows correlation to amounts of wind-wave energy and to specific wind directions. Human impact on the coast includes dredging at the port channel, mining of sand, driving motor vehicles, and deposition of construction debris. Relations between shore retreat rate and aforementioned factors were studied, including dependencies on ice content, and shore segmentation was carried out. This allows for coastal dynamics forecasts in the region.

MONITORING THE DYNAMICS OF THERMOABRASION COASTS AT KHARASAVEY AREA, WESTERN YAMAL (KARA SEA)

2017 ◽  
Author(s):  
Dmitry Kuznetsov ◽  
Dmitry Kuznetsov ◽  
Anatoliy Kamalov ◽  
Anatoliy Kamalov ◽  
Nataliya Belova ◽  
...  
Keyword(s):  
Human Impact ◽  
Remote Sensing Data ◽  
Kara Sea ◽  
Motor Vehicles ◽  
Yamal Peninsula ◽  
Western Coast ◽  
Frozen Ground ◽  
Coastal Dynamics ◽  
The North ◽  
Ice Content

The dynamics of thermoabrasion coasts on loose sediments under permafrost conditions are highly variable due to several factors: length of the dynamic period of the year, mechanic composition of the frozen ground and its ice content, hydrometeorological conditions, and human impact. Multiannual monitoring of the coastal zone was carried out by Lab. Geoecology of the North (Moscow State University) at the 22 km long Kharasavey deposit site, Western Coast of Yamal Peninsula (Kara Sea). The methods include direct measurements and observations (repeated topographic survey of shore transects from 1981 to 2012) along with remote sensing data analysis (images from 1964 to 2011). This allowed producing detailed characteristics of coastal dynamics. At the site, thermoabrasion coasts occupy the most part, and accumulative coasts are present in the north. Data on natural relief forming factors and ground composition are included in the detailed geomorphologic map of the site. Shore retreat rate shows correlation to amounts of wind-wave energy and to specific wind directions. Human impact on the coast includes dredging at the port channel, mining of sand, driving motor vehicles, and deposition of construction debris. Relations between shore retreat rate and aforementioned factors were studied, including dependencies on ice content, and shore segmentation was carried out. This allows for coastal dynamics forecasts in the region.

IMPLEMENTATION OF DIFFERENT TIME REMOTE SENSING DATA IN INVESTIGATION OF DYNAMICS OF ARCTIC COASTS

2018 ◽  
Author(s):  
Д. Кузнецов ◽  
D. Kuznecov ◽  
А. Носков ◽  
A. Noskov ◽  
С. Огородов ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Human Impact ◽  
Remote Sensing Data ◽  
Kara Sea ◽  
The Arctic ◽  
Coastal Dynamics ◽  
Petroleum Resources ◽  
Coastal Retreat ◽  
Geomorphic Processes

Natural geomorphic processes set the rules of development of petroleum resources in offshore and coastal areas in the Arctic. Coastal zone here is highly dynamic due to contact with cryolithozone. Considering eventual human impact and forecasted climatic change, coastal retreat rate may increase significally. To study peculiarities of coastal dynamics at Yamal and Ural coasts of Baydaratskaya bay, Kara Sea, the network for instrumental monitoring was established. Long-term observations carried out there were largely complemented with results of analysis of different time imagery along with state maps with use of GIS. Precise reference, alignment and comparison of diverse materials was done using an array of specific distinguishable relief features. As the result, maps of coastal dynamics were produced. After correlation with instrumental monitoring data they were subsequently used as the base for synthetic maps showing classification and segmentation of shores. Following evaluation of the research, changes were made to the construction project for offshore and onshore pipelines in the studied area.

scholarly journals Cartographie De La Dynamique Historique Du Trait De Côte Des Plages De Guédiawaye Et Malika (Dakar, Sénégal)

2021 ◽  
Vol 17 (25) ◽  
pp. 214
Author(s):  
Papa Sagne ◽  
Kader Ba ◽  
Boubacar Fall ◽  
Jean Paul Marcel Youm ◽  
Gayane Faye ◽  
...  
Keyword(s):  
Development Policy ◽  
Remote Sensing Data ◽  
Coastal Development ◽  
Ecological Value ◽  
Human Pressure ◽  
Coastal Dynamics ◽  
The North ◽  
Digital Shoreline Analysis System ◽  
Analysis System ◽  
Sand Extraction

L’érosion côtière est une des causes de la disparition des plages, du recul des falaises et de la perte de terrains à valeur socio-économique et écologique. La compréhension de la dynamique côtière est donc primordiale avant d’entreprendre toute politique d’aménagement du littoral. Cette étude se propose de retracer la dynamique historique du trait de côte de la zone de Malibu à Malika au Nord de Dakar qui subit actuellement une forte pression humaine avec l’extension de la Voie de Dégagement Nord. Elle est basée sur l’analyse de données de télédétection au moyen du logiciel ArcGIS 10.4 et de l’extension DSAS 4.3 (Digital Shoreline Analysis System). Les résultats obtenus laissent apparaitre, entre 1942 et 2011, une évolution du trait de côte en faveur d’une érosion avec une vitesse moyenne de -0,15 m/an. Cette évolution, qui n’est pas uniforme d’un secteur à un autre mais aussi d’une période à une autre, serait essentiellement due à l’action des agents hydrodynamiques qui gouvernent les mouvements sédimentaires. Néanmoins, la pression humaine commence à se faire sentir avec l’extension de la Voie de Dégagement Nord, les extractions de sables et la coupe des filaos au profit des constructions humaines dont les conséquences sur la dynamique côtière peuvent être alarmantes. Coastal erosion is one of the causes of the disappearance of beaches, retreat of cliffs and loss of land with socio-economic and ecological value. Understanding coastal dynamics is therefore essential before undertaking any coastal development policy. This study aims to retrace the historical dynamics of the coastline from the Malibu to Malika area located in the north of Dakar which is currently under strong human pressure with the extension of the Northern Clearance Way. It is based on the analysis of remote sensing data using ArcGis 10.4 and the DSAS 4.3 extension (Digital Shoreline Analysis System). The results obtained show, between 1942 and 2011, an evolution of the coastline in favor of erosion with an average speed of -0.15 m/year. This evolution, which is not uniform from a sector to another, but also from one period to another, is essentially due to the hydrodynamic agents which govern sediment movements. However, human pressure is starting to be felt with the extension of the Northern Clearance Way, sand extraction and the cutting of casuarinas for human constructions benefit. The consequences of such practices on coastal dynamics can be alarming.

scholarly journals Dynamics of Permafrost Coasts of Baydaratskaya Bay (Kara Sea) Based on Multi-Temporal Remote Sensing Data

2018 ◽  
Vol 10 (9) ◽  
pp. 1481 ◽  
Author(s):  
Anna Novikova ◽  
Nataliya Belova ◽  
Alisa Baranskaya ◽  
Daria Aleksyutina ◽  
Alexey Maslakov ◽  
...  
Keyword(s):  
Human Impact ◽  
Industrial Development ◽  
Remote Sensing Data ◽  
Thermal Action ◽  
Weather Conditions ◽  
Kara Sea ◽  
Sea Waves ◽  
Multi Temporal ◽  
Key Sites ◽  
The 1960S

Arctic coasts that are composed of frozen deposits are extremely sensitive to climate change and human impact. They retreat with average rates of 1–2 m per year, depending on climatic and permafrost conditions. In recent decades, retreat rates have shown a tendency to increase. In this paper, we studied the coastal dynamics of two key sites (Ural and Yamal coasts) of Baydaratskaya Bay, Kara Sea, where a gas pipeline had been constructed. Based on multi-temporal aerial and satellite imagery, we identified coastal erosion rates at several time lapses, in natural conditions and under human impact, and discussed their temporal variability. In addition to planimetric (m/yr), we calculated volumetric (m3/m/yr) retreat rates of erosional coasts using ArcticDEM. We also estimated the influence of geomorphology, lithology, and permafrost structure of the coasts on spatial variations of their dynamics. Erosional coasts of the Ural key site retreat with higher mean rates (1.2 m/yr and 8.7 m3/m/yr) as compared to the Yamal key site (0.3 m/yr and 3.7 m3/m/yr) due to their exposure to higher open sea waves, more complex lithology, higher ice content and lower coastal bluffs. Since the 1960s, coastal retreat rates have been growing on both coasts of Baydaratskaya Bay; we relate this effect with Arctic climate warming. From the 1960s to 2005, such growth was moderate, while in 2005–2016 it became rapid, which may be explained by the enhanced wave and thermal action or by the onset of industrial development. The adjacent coastal segments, originally accumulative, remained relatively stable from the 1960s to 2005. After 2005, a considerable part of them began to retreat as a result of changing weather conditions and/or increasing human impact.

scholarly journals Evidence of Unknown Paleo-Tsunami Events along the Alas Strait, West Sumbawa, Indonesia

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 46
Author(s):  
Bachtiar W. Mutaqin ◽  
Franck Lavigne ◽  
Patrick Wassmer ◽  
Martine Trautmann ◽  
Puncak Joyontono ◽  
...  
Keyword(s):  
Radiocarbon Dating ◽  
Pyroclastic Flows ◽  
Western Coast ◽  
Eastern Shore ◽  
Tsunami Deposits ◽  
The West ◽  
Marine Deposits ◽  
Sedimentary Records ◽  
The North ◽  
Large Earthquakes

Indonesia is exposed to earthquakes, volcanic activities, and associated tsunamis. This is particularly the case for Lombok and Sumbawa Islands in West Nusa Tenggara, where evidence of tsunamis is frequently observed in its coastal sedimentary record. If the 1815 CE Tambora eruption on Sumbawa Island generated a tsunami with well-identified traces on the surrounding islands, little is known about the consequences of the 1257 CE tremendous eruption of Samalas on the neighboring islands, and especially about the possible tsunamis generated in reason of a paucity of research on coastal sedimentary records in this area. However, on Lombok Island, the eruption of the Samalas volcano produced significant volumes of pyroclastic flows that entered the sea in the North and East of the island. These phenomena must have produced a tsunami that left their traces, especially on Sumbawa Island, whose western coastline is only 14 km away from Lombok’s eastern shore. Therefore, the main goal of this study is to investigate, find evidence, and determine the age of marine-origin sediments along the shore of the Alas Strait, Indonesia. We collected and analyzed samples of coral and seashells from marine deposits identified along the west coast of Sumbawa, i.e., in Belang Island and abandoned fishponds in Kiantar Village, in order to identify the sources and the occurrence period of these deposits events. Based on the radiocarbon dating of coral and seashell samples, we concluded that none of the identified marine deposits along the western coast of Sumbawa could be related chronologically to the 1257 CE eruption of Samalas. However, possible tsunami deposits located in Belang Island and abandoned fishponds in Kiantar Village yielded 4th century CE, 9th century CE, and 17th century CE. We also conclude that past large earthquakes triggered these tsunamis since no known volcanic eruption occurred near the Alas Strait at that time that may have triggered a tsunami.

Creep Parameters for Pile Settlement Equations

1989 ◽  
Vol 111 (4) ◽  
pp. 258-263
Author(s):  
D. Stelzer ◽  
O. B. Andersland
Keyword(s):  
Static Load ◽  
Experimental Tests ◽  
Sand Particle ◽  
Shear Stresses ◽  
Frozen Ground ◽  
Creep Equation ◽  
Frozen Sand ◽  
Pile Settlement ◽  
Ice Content ◽  
Friction Pile

Friction pile settlement in frozen ground is tyically predicted on the basis of a creep equation relating shear stresses at the soil/pile interface to pile displacement rates. Creep parameters are used to characterize soil type, soil/ice structure, temperature, and loading conditions. Experimental tests involving model steel piles embedded in frozen sand provided data showing that change in a given test variable can alter the numerical value for some of the creep parameters. The test variables included static, incremental, and dynamic loading; pile surface roughness; soil ice content; and sand particle size. Changes observed included the apparent effect on creep rate when a small dynamic load was superimposed on the static load. A tabulation of observed creep parameter changes is included.

Biochemical responses of the marine mussel Mytilus galloprovincialis to petrochemical environmental contamination along the North-western coast of Portugal

Chemosphere ◽  
2007 ◽  
Vol 66 (7) ◽  
pp. 1230-1242 ◽  
Author(s):  
Inês Lima ◽  
Susana M. Moreira ◽  
Jaime Rendón-Von Osten ◽  
Amadeu M.V.M. Soares ◽  
Lúcia Guilhermino
Keyword(s):  
Environmental Contamination ◽  
Mytilus Galloprovincialis ◽  
Western Coast ◽  
Marine Mussel ◽  
Biochemical Responses ◽  
The North ◽  
North Western
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