scholarly journals Neolithic developments in the Gorgan Plain, south-east of the Caspian Sea

Antiquity ◽  
2017 ◽  
Vol 91 (358) ◽  
Author(s):  
Kourosh Roustaei ◽  
Jebrael Nokandeh
Keyword(s):  
Caspian Sea ◽  
Large Scale ◽  
The Caspian Sea ◽  
North East ◽  
Ceramic Assemblages

Until about two decades ago, the Neolithic of north-east Iran was known only from a few brief excavation reports: the sites of Yarim Tappeh (Stronach 1972) and Turang Tappeh (Deshayes 1967) on the Gorgan Plain, and preliminary reports of large-scale excavations at the twin mound of Sang-e Chakhmaq in the southern foothills of the eastern Alborz Mountains (e.g. Masuda 1984). In the absence of absolute chronologies, these sites were dated by ceramic assemblages to the sixth millennium BC, and were considered to relate to the so-called ‘Jeitun Culture’ of southern Turkmenistan (Figure 1; Roustaei 2016a).

scholarly journals STATE OF POPULATION OF PIKE PERCH OF THE LOWER FLOW OF THE URAL RIVER

2018 ◽  
pp. 83-89
Author(s):  
Sergey Vladimirovich Kuzmenko ◽  
Arkadii Fedorovich Sokolsky ◽  
Alexander Nickolaevich Nevalennyy ◽  
Nikolay Nikolayevich Popov
Keyword(s):  
Caspian Sea ◽  
Fishing Ground ◽  
Commercial Fishing ◽  
The Caspian Sea ◽  
Foreign Markets ◽  
North East ◽  
The North ◽  
Pike Perch ◽  
Exploration And Production ◽  
Commercial Species

In domestic and foreign markets a great demand for pike perch is caused by the fact that its meat is a digestible and dietetic product. Due to growing scales of exploration and production of oil, as well as of poaching in the last years pikeperch and other species suffer from anthropogenic load. In 1990 spike perch catches reached 4.49.000 tons and made 1/3 of total catch of semi anadromous and river fish. During the last decade pike perch catches have decreased in the Ural-Caspian region up to 380 t, according to data of 2016. The study of pike perch populations on fishing zones of the Ural (delta, Malaya Dambinskaya fishing ground) covered the data obtained in 2010-2016. There have been studied migrating periods of pike perch to the spawning grounds. Since 2011 there has been stated a drastic decrease of sire number and a much less catch of pike perch per one casting in autumn, which was caused by the permission for fishing in the coastal part of the Caspian Sea. According to the research data, there have been given size-weight parameters of pike-perch producers in the Ural river during 10 years (2006-2016). The tendency to juvenation of spawning pike perch species is stated due to increasing share of the first spawning species, as well as due to decreasing number of male species in the catches as their age increased. Fultin and Clark’s condition coefficients are shown. Importance of pike perch as a commercial species in the ecosystem of the Ural-Caspian fishery zone contributes to define the following recommendations on saving and restoring pike perch population: to reduce commercial catches in the estuarine area of the Ural; to forbid commercial fishing in the coastal area of the north-east part of the Caspian Sea; to intensify fishery inspection in the Urals.

Large-Scale Pore Pressure Prediction after Pre-Stack Depth Migration in The Caspian Sea

2008 ◽  
Author(s):  
Norbert van de Coevering ◽  
Hazim Hameed Al-Dabagh ◽  
Liau Min Hoe and Tony Jolly
Keyword(s):  
Pore Pressure ◽  
Caspian Sea ◽  
Large Scale ◽  
The Caspian Sea ◽  
Depth Migration ◽  
Pore Pressure Prediction

scholarly journals La place de la mer Caspienne dans la politique étrangère russe

1970 ◽  
pp. 13
Author(s):  
Khagani Guliyev
Keyword(s):  
Foreign Policy ◽  
Soviet Union ◽  
Caspian Sea ◽  
Large Scale ◽  
Russian Foreign Policy ◽  
The Caspian Sea ◽  
The Soviet Union ◽  
New Challenges ◽  
The 19Th Century

This study focuses on the question of the role of the Caspian Sea at a large scale in the current Russian foreign policy. It is noted that though in the historical perspective the Caspian Sea basin had been totally dominated by Russia since the beginning of the 19th century, this domination was contested and considerably reduced after the collapse of the Soviet Union. Paradoxically, in parallel for various reasons exposed in the paper, the Caspian Sea gained more importance in the Russian foreign policy giving rise to new challenges for the future of the Russian power in the region.

Large-scale pore pressure prediction after pre-stack depth migration in the Caspian Sea

First Break ◽  
2007 ◽  
Vol 25 (1111) ◽  
Author(s):  
N. van de Coevering ◽  
H. Hameed Al-Dabagh ◽  
L. Min Hoe ◽  
T. Jolly
Keyword(s):  
Pore Pressure ◽  
Caspian Sea ◽  
Large Scale ◽  
The Caspian Sea ◽  
Depth Migration ◽  
Pore Pressure Prediction

Spill Response Planning in the Republic of Kazakhstan1

2003 ◽  
Vol 2003 (1) ◽  
pp. 1185-1187
Author(s):  
Mark Shepherd
Keyword(s):  
Oil Spill ◽  
Caspian Sea ◽  
Former Soviet Union ◽  
Oil Industry ◽  
The Caspian Sea ◽  
Large Country ◽  
North East ◽  
Response Planning ◽  
Tier 1 ◽  
The Republic

ABSTRACT In recent years the international oil industry has been increasingly active in the former Soviet Union region. The Caspian Sea area alone has estimated reserves of 70 billion barrels of oil. The northeast Caspian region, the focus of major exploration campaigns in the last two years, is a unique environment where the sea level can vary between zero and 10 metres purely as a consequence of the wind direction. Temperatures range between +40 degrees Celsius in the summer to −40 degrees in winter, with the north east Caspian sea being frozen for some four to five months of the year. These factors not only make the region very challenging from an operational point of view, but present a whole new set of challenges for the oil spill response planners. The Republic of Kazakhstan (RoK) is a very large country and industry is widely distributed with operational oil spill risks arising from pipeline operations, exploration, production and distribution of refined product. The goal was set by the oil industry to assess the spill risks in the region and firstly to identify individual Tier 1 requirements. Having established the Tier 1 needs, the study progressed to a review of the logistics and of the available infrastructure. Using a combination of these resources, one could determine whether a credible Tier 2 capability could be developed or whether additional stockpiles and trained personnel would be required.

Abrupt changes in wave climate of regional seas caused by large-scale atmospheric forcing and teleconnections

2020 ◽  
Author(s):  
Nadia Kudryavtseva
Keyword(s):  
Baltic Sea ◽  
Caspian Sea ◽  
Large Scale ◽  
Wave Climate ◽  
The Baltic Sea ◽  
The Caspian Sea ◽  
Abrupt Changes ◽  
Wave Heights ◽  
The Baltic

<p>Climate warming is expected to change the functioning of regional seas substantially. However, it is still an open question how the global climate processes will affect in the future the regional seas, their wave climate, changes in the storm surges and, consequently, the coastal erosion, flooding risks, and coastal communities. In this study, we perform a detailed analysis of the wave climate of the Baltic Sea and the Caspian Sea based on the multi-mission satellite altimetry data in 1990 – 2017. The dataset of significant wave heights (SWH) from ten satellites was cross-validated against regional in situ buoy and echosounder measurements. In the Caspian Sea, due to the limited availability of the in-situ measurements, the satellite data were validated with visual wave measurements. After correction for systematic differences, the visual observations showed excellent correspondence with monthly averaged satellite data with a typical root mean square difference of 0.06 m. Even though several satellite pairs (ENVISAT/JASON-1, SARAL/JASON-2, ERS-1/TOPEX) exhibit substantial mutual temporal drift, and calm wave conditions are ignored, the overall picture is very consistent. The averaged over the whole basin annual mean SWH in the Baltic Sea shows an increase of 0.005 m/yr but no significant trend is detected in the Caspian Sea.</p><p>Interestingly, in both Baltic and Caspian seas, changes in the average SWH exhibit a strong spatial pattern. In the Baltic Sea, a meridional pattern is detected: an increase in the central and western parts of the sea and a decrease in the eastern part. This pattern has a timescale of ~13 yr. We also found a faster-varying region in the Baltic Proper where trends in the wave heights experience abrupt changes with a timescale of 3 years and show a strong relation to changes in the North Atlantic Oscillation. In the Caspian Sea, the wave height decreased by 0.019 ± 0.007 m/yr in the eastern segment of the central basin and by 0.04 ± 0.04 m/yr in the western segment of the southern basin when the other parts showed an increase of wave heights. These changes can be explained by an increase in the frequency of westerly winds at the expense of southerly winds. Analysing the changes in the atmospheric forcing we found that there is a cyclic behaviour with a timescale of ~12 years which result in abrupt changes in the wave climate every 12 years, causing the trends in different regions to reverse its sign.</p><p>We demonstrate that the impact on the coast and coastal community is caused by a complex chain of events, starting from changes in the wind direction due to large-scale atmospheric variability and atmospheric teleconnections, which create abrupt shifts in the wave climate of regional seas. We discuss that regional seas have a different response to the changing climate compared to the open ocean condition, which can lead to accelerated coastal erosion and a higher risk of flooding.</p>

scholarly journals Applicability of GRACE and GRACE-FO for monitoring water mass changes of the Aral Sea and the Caspian Sea

2020 ◽  
Vol 26 (2) ◽  
pp. 443-453
Author(s):  
Lorant Földváry ◽  
Victor Statov ◽  
Nizamatdin Mamutov
Keyword(s):  
Gravity Field ◽  
Caspian Sea ◽  
Large Scale ◽  
Aral Sea ◽  
Water Volume ◽  
Satellite Mission ◽  
The Caspian Sea ◽  
Gravity Fields ◽  
Range Rate ◽  
Sea Area

The GRACE gravity satellite mission has provided monthly gravity field solutions for about 15 years enabling a unique opportunity to monitor large scale mass variation processes. By the end of the GRACE, the GRACE-FO mission was launched in order to continue the time series of monthly gravity fields. The two missions are similar in most aspects apart from the improved intersatellite range rate measurements, which is performed with lasers in addition to microwaves. An obvious demand for the geoscientific applications of the monthly gravity field models is to understand the consistency of the models provided by the two missions. This study provides a case-study related consistency investigation of GRACE and GRACE-FO monthly solutions for the Aral Sea region. As the closeness of the Caspian Sea may influence the monthly mass variations of the Aral Sea, it has also been involved in the investigations. According to the results, GRACE-FO models seem to continue the mass variations of the GRACE period properly, therefore their use jointly with GRACE is suggested. Based on the justified characteristics of the gravity anomaly by water volume variations in the case of the Aral Sea, GRACE models for the period March–June 2017 are suggested to be neglected. Though the correlation between water volume and monthly gravity field variations is convincing in the case of the Aral Sea, no such a correlation for the Caspian Sea could have been detected, which suggests to be the consequence of other mass varying processes, may be related to the seismicity of the Caspian Sea area.

Sign in / Sign up

Export Citation Format

Share Document