SHORT-TERM VARIABILITY OF COASTAL ZONE HYDRODYNAMICS UNDER AN EXTERNAL FORCING: OBSERVATIONS AT THE BLACK SEA RESEARCH SITE OF SIO RAS

2017 ◽  
Author(s):  
Andrey Zatsepin ◽  
Andrey Zatsepin ◽  
Sergey Kuklev ◽  
Sergey Kuklev ◽  
Alexander Ostrovskii ◽  
...  
Keyword(s):  
Coastal Zone ◽  
The Black Sea ◽  
External Forcing ◽  
Short Term ◽  
Shirshov Institute ◽  
Open Sea ◽  
Observational Site ◽  
Upper Mixed Layer ◽  
The Impact ◽  
Short Term Variability

Since 2010, the P.P. Shirshov Institute of Oceanology RAS (SIO RAS) in Gelendzhik maintains the research (observational) site for year round multi-disciplinary studies and monitoring of the marine environment in the coastal zone. Analysis of the data obtained at the observational site revealed the existence of well pronounced short-term variability of coastal zone hydrodynamics at time scales from 1-3 days to 1-2 weeks. The paper examines the role of external forcing (including the impact of adjoined open sea dynamics and wind stress) in the short-term variability of hydrodynamics and upper mixed layer evolution.

SHORT-TERM VARIABILITY OF COASTAL ZONE HYDRODYNAMICS UNDER AN EXTERNAL FORCING: OBSERVATIONS AT THE BLACK SEA RESEARCH SITE OF SIO RAS

2017 ◽  
Author(s):  
Andrey Zatsepin ◽  
Andrey Zatsepin ◽  
Sergey Kuklev ◽  
Sergey Kuklev ◽  
Alexander Ostrovskii ◽  
...  
Keyword(s):  
Coastal Zone ◽  
The Black Sea ◽  
External Forcing ◽  
Short Term ◽  
Shirshov Institute ◽  
Open Sea ◽  
Observational Site ◽  
Upper Mixed Layer ◽  
The Impact ◽  
Short Term Variability

Since 2010, the P.P. Shirshov Institute of Oceanology RAS (SIO RAS) in Gelendzhik maintains the research (observational) site for year round multi-disciplinary studies and monitoring of the marine environment in the coastal zone. Analysis of the data obtained at the observational site revealed the existence of well pronounced short-term variability of coastal zone hydrodynamics at time scales from 1-3 days to 1-2 weeks. The paper examines the role of external forcing (including the impact of adjoined open sea dynamics and wind stress) in the short-term variability of hydrodynamics and upper mixed layer evolution.

SPECIALIZED OCEANOGRAPHIC DATABASE FOR INFORMATION SUPPORT OF THE BLACK SEA COASTAL ZONE STUDY

2017 ◽  
Author(s):  
Alexey Khaliulin ◽  
Alexey Khaliulin ◽  
Andrey Ingerov ◽  
Andrey Ingerov ◽  
Elena Zhuk ◽  
...  
Keyword(s):  
Coastal Zone ◽  
Black Sea ◽  
Data Bank ◽  
Information Support ◽  
The Black Sea ◽  
Federal State ◽  
Short Term ◽  
Marine Hydrophysical Institute ◽  
State Budget ◽  
Oceanographic Data

The information resources of the Federal State Budget Scientific Institution “Marine Hydrophysical Institute of RAS” (FSBSI MHI) oceanographic data bank (MHI BOD), which contains about 115,000 oceanographic and more than 27,000 hydrochemical stations accomplished in the Black Sea coastal zone, as well as experience accumulated while providing information support of the coastal zone research, main directions of activities, and short-term plans are considered.

Anthropogenic Impact on the Lithodynamics of the Coastal Zone of the Southern and Western Black Sea Coast (Review)

2021 ◽  
Author(s):  
T. V. Efremova ◽  
Yu. N. Goryachkin ◽  
◽  
Keyword(s):  
Coastal Zone ◽  
Black Sea ◽  
Bottom Sediments ◽  
Anthropogenic Impact ◽  
River Flow ◽  
The Black Sea ◽  
Negative Consequences ◽  
Coastal Zones ◽  
Natural Dynamics ◽  
The Impact

Anthropogenic impact on lithodynamics of the coastal zone changes the natural dynamics of bottom sediments, which leads to increased abrasion and swelling of beaches, activation of landslide processes creating a threat of destruction of the coastal infrastructure. The article aims at providing an overview of the scientific literature on the anthropogenic impact on lithodynamics of the coastal zone of the southern and western coasts of the Black Sea (shores of Romania, Bulgaria and Turkey). The work shows that with all the differences in the natural conditions of the coastal zones of these countries the types of anthropogenic effects they undergo are almost the same. These include: hydrotechnical construction without regard to the impact on the neighbouring coast sections; reduction of solid river flow due to river regulation by reservoirs; construction of capital facilities directly on the beaches; illegal extraction of sand from beaches and river beds; dredging with sale of the extracted material to construction companies; covering of cliffs by various structures; destruction of coastal dunes, etc. The main negative consequences of these actions are reflected in disruption of natural dynamics and shortages of bottom sediments, changes in the coastline, reduced aesthetic attractiveness and accessibility of shores, destruction of coastal ecosystems. The article also provides information on the legislation of these countries regarding environmental management in the coastal zone

scholarly journals Fetal Vibroacoustic Stimulation in Computerized Cardiotocographic Analysis: The Role of Short-Term Variability and Approximate Entropy

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Maria Laura Annunziata ◽  
Mariamaddalena Scala ◽  
Natascia Giuliano ◽  
Salvatore Tagliaferri ◽  
Olga Carmela Maria Imperato ◽  
...  
Keyword(s):  
High Risk ◽  
Perinatal Outcomes ◽  
Approximate Entropy ◽  
Computer Assisted ◽  
Short Term ◽  
Fetal Movements ◽  
The Impact ◽  
Short Term Variability

The aim of this study was to evaluate the impact of vibroacoustic stimulation (VAS) on computerized cardiotocography short-term variability (STV) and approximate entropy (ApEn) in both low- and high-risk pregnancies. VAS was performed on 121 high- and 95 low-risk pregnancies after 10 minutes of continuous quiet, while their FHR parameters were monitored and recorded by cCTG analysis. Fetal heart rate was recorded using a computer-assisted equipment. Baseline FHR, accelerations, decelerations, STV, long-term irregularity (LTI), ApEn, and fetal movements (FMs) were calculated for defined observational periods before VAS and after 10 minutes. Data were also investigated in relationship with the perinatal outcome. In each group of patients, FHR after VAS remained almost unmodified. Fetal movements significantly increased after VAS in both groups. Results show that only in the high-risk pregnancies, the increase of STV and the decrease of ApEn after VAS were significantly associated with favorable perinatal outcomes.

scholarly journals Quantifying the impact of emission outbursts and non-stationary flow on eddy-covariance CH<sub>4</sub> flux measurements using wavelet techniques

2019 ◽  
Vol 16 (16) ◽  
pp. 3113-3131 ◽  
Author(s):  
Mathias Göckede ◽  
Fanny Kittler ◽  
Carsten Schaller
Keyword(s):  
Eddy Covariance ◽  
Methane Flux ◽  
Stationary Flow ◽  
Methane Emissions ◽  
Gap Filling ◽  
Short Term ◽  
Flux Measurements ◽  
Systematic Biases ◽  
The Impact ◽  
Short Term Variability

Abstract. Methane flux measurements by the eddy-covariance technique are subject to large uncertainties, particularly linked to the partly highly intermittent nature of methane emissions. Outbursts of high methane emissions, termed event fluxes, hold the potential to introduce systematic biases into derived methane budgets, since under such conditions the assumption of stationarity of the flow is violated. In this study, we investigate the net impact of this effect by comparing eddy-covariance fluxes against a wavelet-derived reference that is not negatively influenced by non-stationarity. Our results demonstrate that methane emission events influenced 3 %–4 % of the flux measurements and did not lead to systematic biases in methane budgets for the analyzed summer season; however, the presence of events substantially increased uncertainties in short-term flux rates. The wavelet results provided an excellent reference to evaluate the performance of three different gap-filling approaches for eddy-covariance methane fluxes, and we show that none of them could reproduce the range of observed flux rates. The integrated performance of the gap-filling methods for the longer-term dataset varied between the two eddy-covariance towers involved in this study, and we show that gap-filling remains a large source of uncertainty linked to limited insights into the mechanisms governing the short-term variability in methane emissions. With the capability for broadening our observational methane flux database to a wider range of conditions, including the direct resolution of short-term variability on the order of minutes, wavelet-derived fluxes hold the potential to generate new insight into methane exchange processes with the atmosphere and therefore also improve our understanding of the underlying processes.

Coastal zone dynamics - as a result of changes at the border of three environments

2021 ◽  
Author(s):  
Oleksii Batyrev ◽  
Olga Andrianova ◽  
Radomir Belevich ◽  
Michael Skipa
Keyword(s):  
Sea Level ◽  
Coastal Zone ◽  
Black Sea ◽  
World Ocean ◽  
The Black Sea ◽  
Western Coast ◽  
The World ◽  
The Mediterranean ◽  
The Impact ◽  
Coastal Land

&lt;p&gt;Coastal zone research is becoming increasingly important because the impact of climate change is most significant here. The state of coastal regions is determined by the variability in three contact media (geological, water, and air). Evaluation of level changes on the coasts of various parts of the World Ocean (the Mediterranean, Black, Baltic and North Seas, and the Atlantic coasts in Brazil and France) over a long period of time shows various fluctuations with an upward trend in recent decades.&lt;/p&gt;&lt;p&gt;To highlight the factors that determine the seashores' level fluctuations, three contact media parameters were considered on the example of the western part of the Black Sea. Calculations, analysis, and comparison of trends in the variability of hydrometeorological characteristics (air and water temperatures, precipitation, and river discharge) and sea level over a period of more than 100 years have been carried out.&lt;/p&gt;&lt;p&gt;To assess the intensity of fluctuations of the coastal land along the western coast of the Black Sea, the series of level heights were considered at 6 Ukrainian stations: Vylkove, Chornomorsk (Ilyichevsk), Odesa-port, port Yuzhne, Ochakiv and Sevastopol (partially used as a benchmark), at 2 stations on the Romanian coast: Constanta and Sulina, and 2 stations on the Bulgarian coast: Burgas and Varna. Estimates of the dynamics of the land for the stations of this region's coastal zone for more than a 100-year period are calculated, and it is shown in which way changes in sea level are a consequence of the processes occurring in the coastal land and at the bottom.&lt;/p&gt;&lt;p&gt;Comparison of the years with extreme fluctuations in the sea level with the years of the global El Ni&amp;#241;o phenomenon showed that one of the causes of the observed disturbances in the water and air environments is the distant manifestations of this phenomenon.&lt;/p&gt;&lt;p&gt;Level fluctuations, both in the Black Sea and in the World Ocean, are synchronous at low-frequency scales (their period is more than 5 years) since global climatic processes on our planet influence them; short-term fluctuations are distinguished by regional features and are created under the influence of local factors (tectonic, geophysical, hydrostatic, etc.).&lt;/p&gt;&lt;p&gt;Modeling and predicting changes in the coastal zone of various parts of the World Ocean requires continuation of systematic observations of sea-level fluctuations, hydrometeorological characteristics, and seismic conditions in regions with the longest data series; it's crucial for the Black Sea as well for the Mediterranean, Baltic, North Seas, and Atlantic shores.&lt;/p&gt;

The impact of short-term variability and uncertainty on long-term power planning

2018 ◽  
Vol 284 (1) ◽  
pp. 199-223 ◽  
Author(s):  
Henrik C. Bylling ◽  
Salvador Pineda ◽  
Trine K. Boomsma
Keyword(s):  
Short Term ◽  
The Impact ◽  
Short Term Variability

Short-term variability of intertidal microphytobenthic production using an oxygen microprofiling system

2009 ◽  
Vol 60 (7) ◽  
pp. 712 ◽  
Author(s):  
Lionel Denis ◽  
Pierre-Emmanuel Desreumaux
Keyword(s):  
Primary Production ◽  
Incident Light ◽  
High Tide ◽  
Short Term ◽  
Overlying Water ◽  
Benthic Primary Production ◽  
Production Values ◽  
The Impact ◽  
Oxygen Microprofiles ◽  
Short Term Variability

Despite their high productivity and their key role in coastal processes, intertidal areas remain poorly documented because alternating conditions of sediment-water and sediment-air interfaces result in inaccurate temporal estimations of interfacial carbon exchanges. This study describes the short-term variability of microphytobenthic production in an estuarine mudflat (the Canche estuary of the English Channel) by using an autonomous acquisition system for oxygen microprofiles. More than 240 profiles were measured at low and high tide during three deployments performed within a 3-week period (April–May 2007). Additional measurements characterised the surficial sediments (granulometry, porosity, chlorophyll a, temperature, salinity) and incident light. Depth-integrated gross production values were correlated with light intensity and reached up to 146 mg C m–2 h–1, while the turbidity of the overlying water prevented any primary production during immersion. Photosynthesis–irradiance curves were highly variable between field campaigns. Indeed, we have recorded a drastic reduction in microphytobenthic production, which might result from a pulse input of polychaete juveniles (Lanice conchilega). Ephemeral structures, such as invertebrate tubes, are seldom considered as factors that may influence the variability of benthic primary production. Monitoring oxygen microprofiles may be a useful tool for understanding and quantifying the impact of short-term temporal changes on the budgets of microphytobenthic production.

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