scholarly journals Wind-induced sea level fluctuations at Yuzhnyi and Chornomorsk sea ports and evaluation of the possibility of their forecast

2018 ◽  
pp. 100-106
Author(s):  
R. V. Gavrilyuk ◽  
N. M. Yuvchenko
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Black Sea ◽  
Coastal Area ◽  
The Black Sea ◽  
The South ◽  
North West ◽  
The North ◽  
Wind Characteristics ◽  
Sea Ports

The sea level of the Black Sea coastal area is subject to non-periodic wind-induced fluctuations. Such fluctuations affect economic activity of the sea ports, enterprises and businesses located within the coastal area while those may be flooded when the sea level rises and, on the contrary, there is a threat of vessels grounding in case of sea level fall. There are several big sea ports which are located at the north-western part of the Black Sea and affected by wind-induced fluctuations. Therefore, the study of these processes and development of methods allowing their forecast are of great practical interest and this fact proves the topicality of the conducted research. The article's aim is to analyse wind-induced fluctuations within the water area of Yuzhnyi and Chornomorsk sea ports, identify statistical links between such fluctuations and wind characteristics / equations used for calculation of their values. The observations at Chornomorsk (2006-2013) and Yuzhnyi (2000-2011) stations show that within a year there are 1-2 upsurge-downsurge occurrences during an average month, however, the number of those increases up to 3-4 over the autumn-winter period. The average sea level rise at Chornomorsk station is equal to 34 cm, the average sea level fall – 38 cm, maximum values amount to 97 cm and 191 cm, respectively. The average sea level rise at Yuzhnyi station is equal to 30 cm, the average sea level fall – 34 cm, maximum values amount to 91 and 98 cm, respectively. The average duration of wind-induced fluctuations at both stations amount to 34-38 hours. In most cases the sea level rise is observed at Chornomosk station when winds blow from the South and the South-East, at Yuzhnyi station  – when those blow from the South, the South-East and the South-West. The sea level fall is observed at Chornomosk station when winds blow from the North-West and the West, at Yuzhnyi station – when those blow from the North, the North-West and the North-East. Both stations are characterized with effective directions of wind causing occurrence of upsurge-downsurges. Based on the regression analysis equations for calculation of the sea level rise and fall values associated with wind characteristics were defined. The initial value of the sea level and the sum of the wind projections on effective directions for previous 30 hours are used as arguments in the equations. The accuracy of equation-based calculation constitutes 60-90%. The article offers recommendations on the use of equations when forecasting wind-induced fluctuations.

Modeling of ecological conditions in the Euxine Basin in the Sarmatian and Maeotian by methods of diatom analysis

2019 ◽  
pp. 257-261
Author(s):  
Eleonora P. Radionova
Keyword(s):  
Black Sea ◽  
Late Miocene ◽  
The Black Sea ◽  
Subtidal Zone ◽  
Diatom Analysis ◽  
Diatom Flora ◽  
North West ◽  
Ecological Conditions ◽  
The North

The associations and ecological conditions of the existence of modern diatoms of the North-West (Pridneprovsky), Prikerchensky and Eastern regions of the subtidal zone of the Black Sea are considered. Based on the unity of the composition of the Present and Sarmatian-Meotian diatom flora, an attempt has been made to model some of the ecological c situation of the Late Miocene Euxinian basin.

Oscillations of the Black Sea sea level in the north part of the coast

1999 ◽  
Vol 10 (2) ◽  
pp. 123-130
Author(s):  
Yu. I. Goryachkin ◽  
V. A. Ivanov ◽  
Yu. A. Stepanyants
Keyword(s):  
Sea Level ◽  
Black Sea ◽  
The Black Sea ◽  
The North ◽  
North Part

scholarly journals The impact of sea-level rise on tidal characteristics around Australia

Ocean Science ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 147-159 ◽  
Author(s):  
Alexander Harker ◽  
J. A. Mattias Green ◽  
Michael Schindelegger ◽  
Sophie-Berenice Wilmes
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Open Boundary ◽  
Open Boundary Conditions ◽  
Tidal Dissipation ◽  
North West ◽  
The North ◽  
Tidal Changes ◽  
Tidal Characteristics ◽  
The Impact

Abstract. An established tidal model, validated for present-day conditions, is used to investigate the effect of large levels of sea-level rise (SLR) on tidal characteristics around Australasia. SLR is implemented through a uniform depth increase across the model domain, with a comparison between the implementation of coastal defences or allowing low-lying land to flood. The complex spatial response of the semi-diurnal M2 constituent does not appear to be linear with the imposed SLR. The most predominant features of this response are the generation of new amphidromic systems within the Gulf of Carpentaria and large-amplitude changes in the Arafura Sea, to the north of Australia, and within embayments along Australia's north-west coast. Dissipation from M2 notably decreases along north-west Australia but is enhanced around New Zealand and the island chains to the north. The diurnal constituent, K1, is found to decrease in amplitude in the Gulf of Carpentaria when flooding is allowed. Coastal flooding has a profound impact on the response of tidal amplitudes to SLR by creating local regions of increased tidal dissipation and altering the coastal topography. Our results also highlight the necessity for regional models to use correct open boundary conditions reflecting the global tidal changes in response to SLR.

scholarly journals Recent Sea Level Change in the Black Sea from Satellite Altimetry and Tide Gauge Observations

2020 ◽  
Vol 9 (3) ◽  
pp. 185 ◽  
Author(s):  
Nevin Avşar ◽  
Şenol Kutoğlu
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Black Sea ◽  
Satellite Altimetry ◽  
Tide Gauge ◽  
The Black Sea ◽  
Sea Level Changes ◽  
Early 19Th Century ◽  
Mean Sea Level ◽  
The Mean

Global mean sea level has been rising at an increasing rate, especially since the early 19th century in response to ocean thermal expansion and ice sheet melting. The possible consequences of sea level rise pose a significant threat to coastal cities, inhabitants, infrastructure, wetlands, ecosystems, and beaches. Sea level changes are not geographically uniform. This study focuses on present-day sea level changes in the Black Sea using satellite altimetry and tide gauge data. The multi-mission gridded satellite altimetry data from January 1993 to May 2017 indicated a mean rate of sea level rise of 2.5 ± 0.5 mm/year over the entire Black Sea. However, when considering the dominant cycles of the Black Sea level time series, an apparent (significant) variation was seen until 2014, and the rise in the mean sea level has been estimated at about 3.2 ± 0.6 mm/year. Coastal sea level, which was assessed using the available data from 12 tide gauge stations, has generally risen (except for the Bourgas Station). For instance, from the western coast to the southern coast of the Black Sea, in Constantza, Sevastopol, Tuapse, Batumi, Trabzon, Amasra, Sile, and Igneada, the relative rise was 3.02, 1.56, 2.92, 3.52, 2.33, 3.43, 5.03, and 6.94 mm/year, respectively, for varying periods over 1922–2014. The highest and lowest rises in the mean level of the Black Sea were in Poti (7.01 mm/year) and in Varna (1.53 mm/year), respectively. Measurements from six Global Navigation Satellite System (GNSS) stations, which are very close to the tide gauges, also suggest that there were significant vertical land movements at some tide gauge locations. This study confirmed that according to the obtained average annual phase value of sea level observations, seasonal sea level variations in the Black Sea reach their maximum annual amplitude in May–June.

scholarly journals Quantifying the impact of basin dynamics on the regional sea level rise in the Black Sea

Ocean Science ◽  
2017 ◽  
Vol 13 (3) ◽  
pp. 443-452 ◽  
Author(s):  
Arseny A. Kubryakov ◽  
Sergey V. Stanichny ◽  
Denis L. Volkov
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Black Sea ◽  
Satellite Altimetry ◽  
Tide Gauge ◽  
The Black Sea ◽  
Southeastern Part ◽  
Mean Sea Level ◽  
The Impact ◽  
Dynamic Sea Level

Abstract. Satellite altimetry measurements show that the magnitude of the Black Sea sea level trends is spatially uneven. While the basin-mean sea level rise from 1993 to 2014 was about 3.15 mm yr−1, the local rates of sea level rise varied from 1.5–2.5 mm yr−1 in the central part to 3.5–3.8 mm yr−1 at the basin periphery and over the northwestern shelf and to 5 mm yr−1 in the southeastern part of the sea. We show that the observed spatial differences in the dynamic sea level (anomaly relative to the basin-mean) are caused by changes in the large- and mesoscale dynamics of the Black Sea. First, a long-term intensification of the cyclonic wind curl over the Black Sea, observed in 1993–2014, strengthened divergence in the center of the basin and led to the rise of the sea level in coastal and shelf areas and a lowering in the basin's interior. Second, an extension of the Batumi anticyclone to the west resulted in  ∼  1.2 mm yr−1 higher rates of sea level rise in the southeastern part of the sea. Further, we demonstrate that the large-scale dynamic sea level variability in the Black Sea can be successfully reconstructed using the wind curl obtained from an atmospheric reanalysis. This allows for the correction of historical tide gauge records for dynamic effects in order to derive more accurate estimates of the basin-mean sea level change in the past, prior to the satellite altimetry era.

On numerical modelling of currents over the north-west shelf of the Black Sea

1990 ◽  
Vol 1 (4) ◽  
pp. 271-278 ◽  
Author(s):  
V. I. Klimok ◽  
K. K. Makeshov ◽  
M. V. Pertseva ◽  
V. A. Rybalka
Keyword(s):  
Numerical Modelling ◽  
Black Sea ◽  
The Black Sea ◽  
North West ◽  
The North

scholarly journals The spatial pattern of selected extreme precipitation indices for Turkey (1975-2012)

2020 ◽  
Vol 19 (1) ◽  
pp. 19-30
Author(s):  
Faize Sarış
Keyword(s):  
Coastal Zone ◽  
Black Sea ◽  
Extreme Precipitation ◽  
Precipitation Extremes ◽  
The Black Sea ◽  
The South ◽  
Black Sea Region ◽  
North East ◽  
The North ◽  
Rainy Days

AbstractThis paper analyses extreme precipitation characteristics of Turkey based on selected WMO climate change indices. The indices – monthly total rainy days (RDays); monthly maximum 1-day precipitation (Rx1day); simple precipitation intensity index (SDII); and monthly count of days when total precipitation (represented by PRCP) exceeds 10 mm (R10mm) – were calculated for 98 stations for the 38-year overlapping period (1975–2012). Cluster analysis was applied to evaluate the spatial characterisation of the annual precipitation extremes. Four extreme precipitation clusters were detected. Cluster 1 corresponds spatially to Central and Eastern Anatolia and is identified with the lowest values of the indices, except rainy days. Cluster 2 is concentrated mainly on the west and south of Anatolia, and especially the coastal zone, and can be characterised with the lowest rainy days, and high and moderate values of other indices. These two clusters are the most prominent classes throughout the country, and include a total of 82 stations. Cluster 3 is clearly located in the Black Sea coastal zone in the north, and has high and moderate index values. Two stations on the north-east coast of the Black Sea region are identified as Cluster 4, which exhibits the highest values among all indices. The overall results reveal that winter months and October have the highest proportion of precipitation extremes in Turkey. The north-east part of the Black Sea region and Mediterranean coastal area from the south-west to the south-east are prone to frequent extreme precipitation events.

scholarly journals Vitalie Bârca, Notes on the origin and dating of the bone pyxides from the Sarmatian environment between the Don and the Prut

2019 ◽  
Vol 7 (2) ◽  
pp. 129-155
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
New Wave ◽  
North West ◽  
The North ◽  
Group Belonging ◽  
Local Work ◽  
Made In ◽  
Grave Goods

The object of this article is to discuss the bone pyxides discovered in the Sar¬matian graves from the north and north-west of the Black Sea. The study, with¬out being exhaustive, attempts a presentation of the graves where bone pyxides were identified, but also of the cultural environments where similar toiletry piec¬es were used. The conclusion is that bone pyxides in Sarmatian graves from the north and north-west Pontic territory are mainly Roman products. Nonetheless, it is not excluded that some pyxides are copies of the first, made in local work¬shops (north-Pontic). The author notes that all Sarmatian graves containing bone pyxides date, on the basis of grave goods, to the second half of the 1st – early/first decades of the 2nd c. AD. Furthermore, it is noted they are usually part of the grave group belonging to the new wave of Sarmatians arriving to the north-Pontic area starting with mid 1st c. AD from east of the Don and that in the second half of the 1st – first decades of the 2nd c. AD they form a well marked local cultur¬al-chronological horizon. Last but not least, the author notes that pyxides are part of funerary features dating to the period of major inflow of Roman artifacts to the Sarmatian environment set between AD 60/70 – 120/130.

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