Characteristics and Seasonal Distribution of Microplastics in the Surface Waters of Southwest Coast of the Caspian Sea (Guilan Province, Iran)

2021 ◽  
Author(s):  
Majid Rasta ◽  
Mohammad Reza Rahimibashar ◽  
Arash Ershad ◽  
Hor Torabi Jafroudi ◽  
Shahryar Tagheipour Kouhbane
Keyword(s):  
Surface Waters ◽  
Caspian Sea ◽  
Seasonal Distribution ◽  
The Caspian Sea ◽  
Southwest Coast ◽  
Guilan Province

scholarly journals The Linguistic Atlas of the East of Guilan on the Basis of Morphological Analysis (Lexical - Inflectional)

2016 ◽  
Vol 7 (1) ◽  
pp. 1166-1171
Author(s):  
Maryam Mahlouji Afshar ◽  
Iran Kalbassi
Keyword(s):  
Caspian Sea ◽  
Morphological Analysis ◽  
Field Method ◽  
Syntactic Analysis ◽  
The Caspian Sea ◽  
Principal Role ◽  
Language Varieties ◽  
Eastern Border ◽  
Morphological Differences ◽  
Guilan Province

This article, in line with “The National Project of the Dialectology”, aims to provide a linguistic atlas in the East of Guilan province. Due to the large number of speakers in the southern edge of the Caspian Sea and many differences between dialects and accents, this area has great importance linguistically and providing the linguistic atlas in representation and introduction of dialects in this land can be an important achievement to access the indigenous, cultural, social and historical studies among linguistics and persons who are interested in culture. In order to achieve this principal issue, there has been investigated the morphological differences and similarities (lexical - inflectional) of language varieties in the East of Guilan province with the standard Persian- even more than phonetic and syntactic analysis- and they can have the principal role in providing the linguistic atlas. So in this article, through presenting the morphological evidences (lexical - inflectional) and comparing them with standard Persian, there has been marked a dialect with different accents- the Guilaki dialect from the East of Guilan province and it has been depicted for linguistic atlas. The study was conducted by library and field method and by collecting data from a questionnaire consisting of 100 words and sampling from 20 villages in the East of Guilan province- from Astaneh Ashrafieh to the end of the eastern border of Guilan province (Chaboksar). The data obtained by each village has been considered in the tables related to each word and has been moved on the map of region after comparing with the standard Persian and finally the linguistic atlas has been made. To achieve genuine accents, the speakers of middle-aged who spent much of their life in the area have been helped and villages have been considered with more phonetic differences in accent.

scholarly journals An Assessment of Heavy Metals in Coastal Sediments of the Caspian Sea, Guilan Province

2017 ◽  
Vol 8 (31) ◽  
pp. 27-34 ◽  
Author(s):  
Mohsen Mohammedi Galangash ◽  
Esa Solgi ◽  
Zahra Bozorgpanah
Keyword(s):  
Heavy Metals ◽  
Caspian Sea ◽  
Coastal Sediments ◽  
The Caspian Sea ◽  
Guilan Province

INFLUENCE OF OIL-CONTAINING INDUSTRIAL WASTEWATER ON THE COASTAL WATERS OF THE CASPIAN SEA

2021 ◽  
Vol 100 (1) ◽  
pp. 27-35
Author(s):  
L.S. Taizhanova ◽  
◽  
G.Zh. Kenzhetayev ◽  
Keyword(s):  
Surface Waters ◽  
Caspian Sea ◽  
Sea Water ◽  
Underground Water ◽  
High Concentration ◽  
The Caspian Sea ◽  
Industrial Enterprises ◽  
Production Area ◽  
Observation Wells ◽  
Area Monitoring

The article considers the influence of oil-containing wastewater generated from industrial enterprises located on the coast of the Caspian Sea, through underground drains on the groundwater and sea water of the Caspian Sea coast within the Mangistau region, the content of controlled pollutants in the studied samples is given. To determine the dynamics of changes in the level of harmful substances in underground and surface waters, 3 production facilities engaged in oil production and processing, located at different distances from the sea, were selected.Two of them are located on the seashore, one object is located 8 km from the Caspian Sea. In 3 studied objects, wastewater that has been treated is discharged into the reservoir. The work consisted in studying the production area, monitoring the level and temperature of underground and surface waters and conducting laboratory analysis of the content of polluting components in the water using marine stations and hydrogeological observation wells located in the study area. For marine waters in the vicinity of the Karazhanbas field was observed deviations from the concentrations of oil content and iron, the oscillation of the norm of certain substances in groundwater due to the fact that the underground water of the region in the area belong to the province of underground water with high concentration of heavy metals and organic substances and are of chloride-sulfate chemical composition.

Multiscale analysis of lake-effect snow over the southwest coast of the Caspian Sea (31 January-5 February 2014)

Weather ◽  
2017 ◽  
Vol 73 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Parvin Ghafarian ◽  
Nafiseh Pegahfar ◽  
Elaheh Owlad
Keyword(s):  
Caspian Sea ◽  
Multiscale Analysis ◽  
The Caspian Sea ◽  
Southwest Coast ◽  
Lake Effect

scholarly journals Specialty of vertical water exchange of the Caspian sea on the basis of distribution of transient tracers

2019 ◽  
Vol 46 (5) ◽  
pp. 496-502
Author(s):  
V. S. Brezgunov
Keyword(s):  
Deep Water ◽  
Surface Waters ◽  
Caspian Sea ◽  
Large Scale ◽  
Water Exchange ◽  
Vertical Structure ◽  
Gravitational Convection ◽  
The Caspian Sea ◽  
Structure Of Water ◽  
Geochemical Studies

The analysis of the reliability of different scenarios for the formation of the vertical structure of the waters of the Caspian Sea, obtained from the distribution of transient tracers (CFC-11, CFC-12, 3H and 3He) at the deep-water stations of the Middle and Southern Caspian within the framework of international integrated isotope-geochemical studies during the maximum sea level rise in 1995–1996. Taking into account the available hydrometeorological data and the characteristics of water dating using transient tracers, it was concluded that after large-scale gravitational convection in the Middle Caspian caused by anomalous cooling of surface waters in the Northern Caspian at the end of the winter of 1976, a structure of water masses was formed that excluded deep water ventilation in the Middle and South Caspian Sea until the mid-90s.

DEVELOPMENT OF INTEGRATED MONITORING NETWORK FOR MEASURING SALINITY OF SEA WATER

2018 ◽  
pp. 18-26
Author(s):  
Sima Ajdar qizi Askerova
Keyword(s):  
Surface Waters ◽  
Sea Water ◽  
Water Environment ◽  
Monitoring Network ◽  
Monitoring Networks ◽  
The Caspian Sea ◽  
Integrated Monitoring ◽  
Ecological Control ◽  
Different Depths ◽  
Optimal Construction

Monitoring of sea water condition is one of major requirements for carrying out the reliable ecological control of water environment. Monitoring networks contain such elements as sea buoys, beacons, etc. and are designated for measuringvarious hydrophysical parameters, including salinity of sea water. Development of specialized network and a separate buoy system for measuring thesea water salinity at different depths makes it possible to determine major regularities of processes of pollution and self-recovery of the sea waters. The article describes the scientific and methodological basics for development of this specialized network and questions of its optimal construction. It is well-known that at a depth of 30-45 m of the Caspian Sea salinity decreases and then at a depth of 45-60 m salinity is fully recovered. The mentioned changes of salinity at the relatively upper layer of sea waters is of special interest for studying the effect of ocean-going processes on the climate forming in the Caspian area. In terms of informativeness of measurements of surface waters salinity, the most informative is a layer ata 30-60 m depth, where inversion and recovery of salinity take place. It is shown that in most informative subrange of measurements, i. e. at a depth of 30-60 m optimization of regime of measurements complex should be carried out in order to increase the effectiveness of held researches. It is shown that at a depth of 35-50 m choice of the optimum regime of measurements makes it possible to obtain the maximum amount of information.

THE NUMBER AND QUALITATIVE CHARACTERISTICS OF FRY FISH IN SHALLOW COASTAL WATERS OF THE VOLGA IN THE SUMMER-AUTUMN PERIOD OF 2012

2017 ◽  
pp. 65-73
Author(s):  
Edward Vladimirovich Nikitin
Keyword(s):  
Fish Species ◽  
Coastal Waters ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Volga River ◽  
Commercial Fish ◽  
Autumn Period ◽  
Fish Juveniles ◽  
Qualitative Characteristics ◽  
Shallow Coastal Waters

Shallow coastal waters of the Volga river is a flooded feeding area for fish juveniles of nonmigratory fish species. There takes place annual downstream migration of fluvial anadromous fish species from spawning grounds of the Volga river to the Northern Caspian Sea. The most important factors determining the number and qualitative characteristics of fry fishes are the level of the Caspian Sea (currently having a tendency to the lowering), hydrological and thermal regimes of the Volga river. Researches were carried out in definite periods of time. In the summer-autumn period of 2012 fry fishes were presented by 19 species (13 of them were commercial species), which belonged to 9 families. The article gives data on all the commercial fish species. In the first decade of July the maximum number of fry fish was registered in the western part of the Volga outfall offshore - in box 247 (19.86 mln specimens/km2), in the eastern part - in box 142 (20.4 mln specimens/km2). The most populous were roach, red-eye, silver bream and bream; size-weight characteristics were better in the areas remoted from the Volga delta. In the third decade of July the quantitative indicators of fry fish on these areas decreased, size-weight characteristics greatly increased. In the second decade of October in the western part of the seaside there were registered increased pre-wintering concentrations of fish juveniles, their qualitative indicators increased, which is evidence to favorable feeding conditions in 2012.

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