Storm Climate and Morphological Imprints on the Danube Delta Coast

Zăinescu, Florin; Vespremeanu‐Stroe, Alfred

doi:10.1007/978-3-319-32589-7_34

Cited by 3 publications

(3 citation statements)

References 38 publications

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“…This clearly anomalous period approximately from the mid-1960s to the mid-1970s, with a notable maximum in the number of cyclones, was found both in depth and intensity of the total number of cyclones over the Black Sea region on shorter time series in earlier papers [23,42,70], as well as in the frequency of wave heights [15] and water temperature (on the surface and 100 m horizon) [71]. This and other periods of intensification of deep cyclones are consistent with the periods of increasing and decreasing storm activity in the Black Sea region identified in the papers [15,[72][73][74][75][76]. The authors of the paper [72] found the period of positive standardized frequency anomalies of the northern hemisphere cyclones at low latitudes from the mid-1960s to the mid-1970s Frequency Parameter Now, let us specify the intervals and relative values of the periods of low-frequency variability identified in Figure 4 in terms of standardized anomalies (normalized by standard deviation σ) of intense and extreme cyclones referred to as Ria75 and Ria95 (Figure 5).…”

Section: Variability Trends and Anomalies Of Seasonal And Annual Freq...supporting

confidence: 79%

“…The authors of the paper [72] found the period of positive standardized frequency anomalies of the northern hemisphere cyclones at low latitudes from the mid-1960s to the mid-1970s and the period of negative anomalies in the 1990s. The greatest number of storms caused by cyclones was observed in the west of the Black Sea region in the 1960s and after the year 2000 [74], and off the coast of the Danube Delta in the late 1960s, 1970s and 1990s [75]. Besides that, we found earlier that cyclonic activity (total number of cyclones) was characterized by the following patterns over the Black Sea region: an increase in the frequency of winter cyclones over the central and southern parts of the sea in the 1980s and 1990s, while in the 1960s and 2000s the maximum frequency of cyclones moved to the land to the northern part of the Black sea region, while an increase of frequency of winter anticyclones over the southwestern part of the sea was observed.…”

Section: Variability Trends and Anomalies Of Seasonal And Annual Freq...mentioning

confidence: 99%

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Intense Cyclones in the Black Sea Region: Change, Variability, Predictability and Manifestations in the Storm Activity

et al. 2020

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Cyclonic activity in the midlatitudes is a form of general atmospheric circulation, and the most intense cyclones are the cause of hydrometeorological anomalies that lead to economic damage, casualties and human losses. This paper examines the features of variability of intense cyclonic activity in the Black Sea region and the examples of their regional manifestations in the storm types. Based on 6-hourly NCEP/NCAR reanalysis data on 1000 hPa geopotential height fields with 2° × 2° spatial resolution and using the methodology by M.Yu. Bardin, objective data were obtained for the identification and estimation of the frequency of deep cyclones (reaching 0.75 and 0.95 quantiles by intensity and depth—intense and extreme cyclones, respectively) for the Black Sea region during the period 1951–2017. Additionally, a specific methodology of more precise cyclone identification based on spherical spline interpolation was successfully applied, and then the two methodologies were compared. The key point of the study is the following: In the background of negative significant linear trends and interdecadal variability (period of about 35 years), typical scales of their interannual variability on the periods of about 2.5–3.5 and 6–8 years were identified. These periods coincide with the time scales of the North Atlantic Oscillation and El Nino–Southern Oscillation, providing an outlook for further study of the patterns of their connection. Besides, seasonal forecasts of frequency of intense cyclones in the Black Sea region were successfully modeled using an artificial neural network technique. Finally, the case studies of regional manifestations of deep cyclones in the types of storms in the northern Black Sea coast revealed substantial differences in the location of deep centers of cyclones and storm tracks associated with the large-scale pressure fields.

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Section: Variability Trends and Anomalies Of Seasonal And Annual Freq...supporting

confidence: 79%

Section: Variability Trends and Anomalies Of Seasonal And Annual Freq...mentioning

confidence: 99%

Intense Cyclones in the Black Sea Region: Change, Variability, Predictability and Manifestations in the Storm Activity

et al. 2020

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“…Additionally, wind data from the Sulina meteorological station was used, which is situated on the jetties of the Sulina branch of the delta, 40 km north of the study zone (Zăinescu and Vespremeanu‐Stroe, ; Figure B). We applied the Peak Over Threshold (POT) method to the wind speed data for the identification of storm events with wind speeds > 10 m/s.…”

Section: Methodsmentioning

confidence: 99%

The formation and closure of the Big Breach of Sacalin spit associated with extreme shoreline retreat and shoreface erosion

Zăinescu

Vespremeanu‐Stroe

Tătui

2019

Earth Surf Processes Landf

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We document a case of exceptionally large natural breaching of a sandy spit (Sacalin spit, Danube Delta) using multiannual to seasonal surveys of topography and bathymetry on successive cross-barrier and shoreface profiles, LiDAR data, satellite imagery, and wind and wave data.The large breach, which quickly reached 3.4 km in May 2014, is attributed to morphological preconditioning of the narrow (50-150 m) barrier, which was susceptible to breaching even during moderate storm conditions. The event switched the barrier's decadal evolution from low cross-shore transport to high cross-shore transport over the barrier, which is an order of magnitude larger than during the non-breach period. Upper shoreface erosion, as indicated by the extensive erosion down to À4 m, indicates that this zone is a significant source for the rebuilding of the barrier. Barrier recovery and widening trigger a negative feedback which limits the back-barrier sediment transfer. As a result, back-barrier deposition decreases whilst the barrier aggradation through overwash becomes more frequent.The Big Breach (TBB) closed naturally in three years. The very high deposition rate of sediment in the breach is a testimony of the high sediment volumes supplied by the longshore transport and the high sediment released through shoreface retreat, and resulted in widening the barrier to a maximum of 1 km. Since the newly-formed barrier shoreline retreated 500 m, this reveals that barrier breaching is an important mechanism which significantly accelerates the landward migration of the barrier system and is a proof of the highly non-linear morphodynamics involved in the barrier island translation.

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Identification of Domain Complexes in the Danube Delta Coastal Belt Using the Biophysical Cross-shore Classification System (BCCS), Based on Interpretation of Satellite Imagery

Finkl

Makowski

2021

Journal of Coastal Research

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Storm Climate and Morphological Imprints on the Danube Delta Coast

Cited by 3 publications

References 38 publications

Intense Cyclones in the Black Sea Region: Change, Variability, Predictability and Manifestations in the Storm Activity

Intense Cyclones in the Black Sea Region: Change, Variability, Predictability and Manifestations in the Storm Activity

The formation and closure of the Big Breach of Sacalin spit associated with extreme shoreline retreat and shoreface erosion

Identification of Domain Complexes in the Danube Delta Coastal Belt Using the Biophysical Cross-shore Classification System (BCCS), Based on Interpretation of Satellite Imagery

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