AN ARTIFICIAL BEACH AS A MEANS FOR SEA COAST PROTECTION FROM STORM SURGES (BY THE EXAMPLE OF THE EASTERN GULF OF FINLAND)

2017 ◽  
Author(s):  
Igor Leontyev ◽  
Igor Leontyev ◽  
Tatiana Akivis ◽  
Tatiana Akivis
Keyword(s):  
Storm Surges ◽  
Gulf Of Finland ◽  
Beach Sand ◽  
Medium Sand ◽  
Material Loss ◽  
Beach Width ◽  
Intense Storm ◽  
The Gulf Of Finland ◽  
Beach Volume ◽  
Sea Coast

A model of an artificial beach is suggested for protection of coasts under erosion due to intense storm surges. It is shown that the coarser beach sand results in decrease of the beach width and growth of nourishment volume. At the same time relative material loss due to long-shore sediment transport diminishes too. The model has been applied to three sections of the coasts of Kurortny district of S.-Petersburg (eastern part of the Gulf of Finland). It recommends medium sand for the beaches construction. Modeling of extreme storms effect shows only minor deformations for designed beach profiles. For the beaches more than 1 km long even in 30-50 years more than a half of the initial beach volume conserves without additional nourishment.

AN ARTIFICIAL BEACH AS A MEANS FOR SEA COAST PROTECTION FROM STORM SURGES (BY THE EXAMPLE OF THE EASTERN GULF OF FINLAND)

2017 ◽  
Author(s):  
Igor Leontyev ◽  
Igor Leontyev ◽  
Tatiana Akivis ◽  
Tatiana Akivis
Keyword(s):  
Storm Surges ◽  
Gulf Of Finland ◽  
Beach Sand ◽  
Medium Sand ◽  
Material Loss ◽  
Beach Width ◽  
Intense Storm ◽  
The Gulf Of Finland ◽  
Beach Volume ◽  
Sea Coast

A model of an artificial beach is suggested for protection of coasts under erosion due to intense storm surges. It is shown that the coarser beach sand results in decrease of the beach width and growth of nourishment volume. At the same time relative material loss due to long-shore sediment transport diminishes too. The model has been applied to three sections of the coasts of Kurortny district of S.-Petersburg (eastern part of the Gulf of Finland). It recommends medium sand for the beaches construction. Modeling of extreme storms effect shows only minor deformations for designed beach profiles. For the beaches more than 1 km long even in 30-50 years more than a half of the initial beach volume conserves without additional nourishment.

scholarly journals Artificial beach as a structure to defend a sea coast from the storm surge impact (based on the example of the eastern Gulf of Finland)

2019 ◽  
Vol 59 (2) ◽  
pp. 292-301
Author(s):  
I. O. Leont’yev
Keyword(s):  
Storm Surge ◽  
Gulf Of Finland ◽  
Total Width ◽  
Beach Profile ◽  
Medium Sand ◽  
Longshore Sediment Transport ◽  
Long Time ◽  
Equilibrium Profile ◽  
Beach Volume ◽  
Sea Coast

The model of artificial beach to protect a sea coast subjected to erosion under impact of significant storm surge is suggested. The beach profile properties are based on the concept of equilibrium profile by Dean. It is shown that the use of coarser sand provides greater total width of beach, but requires greater volume of constructional berm. At the same time, the loss of material due to longshore sediment transport decreases. Application of the model to three segments of eroded coast in Kurortniy region of St. Petersburg (Eastern Gulf of Finland) allows recommend the medium sand 0.3–0.5 mm to construct the artificial beach. In this case, the width of dry beach section would be about 80–140 m, while the volume of constructional berm would be (1.3÷3.2)×102 m3/m depending on sediment deficit in a given coastal segment. In order to minimize the relative loss of material it is suggested to construct the beach of which the length is not less than 1 km. In this case, more than half of initial beach volume would be kept even after 30 years. Modeling of extreme storm impact leads to conclusion that the designed beach profiles are only slightly deformed and able conserve their resource over a long time.

scholarly journals Storm surges in the Gulf of Finland of the Baltic Sea

2021 ◽  
Vol 66 (4) ◽  
Author(s):  
Evgeny A. Zakharchuk ◽  
◽  
Vladimir N. Sukhachev ◽  
Natal'ia A. Tikhonova ◽  
◽  
...  
Keyword(s):  
Baltic Sea ◽  
Sea Level ◽  
Atmospheric Pressure ◽  
Storm Surges ◽  
Gulf Of Finland ◽  
Northern Coast ◽  
The Baltic Sea ◽  
Wide Range ◽  
The Baltic ◽  
The Gulf Of Finland

The characteristics of storm surges in different regions of the Gulf of Finland in the second half of the XX and the beginning of the XXI centuries were investigated on the basis of tide gauge measurements of sea level, instrumental observations of the wind and data from the reanalysis of meteorological fields. A criterion for identifying storm surges, taking into account spatial changes in their intensity, is proposed. The results indicate that depending on the year and the location of the station, the number of storm surges varies in the Gulf of Finland in a wide range: from 0 - 1 to 16 - 52 cases per year. The average duration of storm surges varies from 6.7 to 9.0 hours, and the maximum reaches 26 to 96 hours. Shown that in recent decades, in most regions, there has been a tendency towards a decrease in the number of storm surges, their dispersion and sea level maximum. The distributions of the probabilities of wind and atmospheric pressure during storm surges are given. Estimates of two-dimensional probability densities indicate that during storm surges, winds blowing from the west and southwest with speeds of 4-13 m / s are most likely. At the northern coast and at the top of the bay, the most probable values of atmospheric pressure during storm surges are 995 hPa. On the southern coast of the Gulf of Finland, atmospheric pressure values of 1005 - 1015 hPa are most likely. The results obtained indicate that the atmospheric pressure over the Gulf of Finland during storm surges is not very low. This is due to the fact that the trajectories of the centers of cyclones causing storm surges pass north of the Gulf of Finland. Analysis of meteorological information also showed the presence of significant negative trends in interannual variations in the dispersion of the horizontal atmospheric pressure gradient, average values and maximums of wind speed. It is concluded that the revealed changes in the characteristics of storm surges are associated with a decrease in the intensity of cyclogenesis in the atmosphere over the Baltic Sea in recent decades.

scholarly journals Case-Study Modelling Analysis of Hydrodynamics in the Nearshore of the Baltic Sea Forced by Extreme Along-shore Wind in the Case of a Cross-shore Obstacle

2018 ◽  
Vol 65 (3) ◽  
pp. 163-176
Author(s):  
Andrei Sokolov ◽  
Boris Chubarenko
Keyword(s):  
Baltic Sea ◽  
Storm Surges ◽  
Gulf Of Finland ◽  
Shore Protection ◽  
Three Dimensional Model ◽  
The Baltic Sea ◽  
Noticeable Effect ◽  
Erosion Processes ◽  
The Baltic ◽  
The Gulf Of Finland

AbstractIn the current study we use a three-dimensional model with hydrodynamic and spectral wave modules operating in a coupled mode to simulate the response of currents and wind wave fields to winds of 20–25 m/sec offshore of the protective structure of the Saint Petersburg Flood Prevention Facility Complex. The model was calibrated against field data, which allowed us to obtain a tool describing storm situations in the eastern part of the Gulf of Finland with a satisfactory accuracy. The numerical modeling showed that the protective dam did not have a noticeable effect on the levels of stormsurge, significantwave height, or current speed in areas seaward of the dam. The increase in erosion processes on the southern shore of the easternmost part of the Gulf of Finland in recent past has most probably been related to other factors. We found that if a west or south-west wind of at least 25 m/s blows over the Baltic Sea for at least 16 hours, the level of storm surges seaward of the dam may reach 3 or more meters. An artificial strengthening of the coastline and the creation of shore protection structures are recommended.

Zooplankton of Koporskaya Bay of the Gulf of Finland in the Zone of the Influence of the Leningrad NPS

2014 ◽  
Vol 50 (4) ◽  
pp. 3-14
Author(s):  
M. Ye. Makushenko ◽  
D. V. Kulakov ◽  
Ye. A. Vereshchagina
Keyword(s):  
Gulf Of Finland ◽  
The Gulf Of Finland

Characteristics and Structure of the Cumulonimbus Cloud with Waterspout over the Gulf of Finland

2020 ◽  
Vol 45 (9) ◽  
pp. 607-614
Author(s):  
V. B. Popov ◽  
A. A. Sin’kevich ◽  
J. Yang ◽  
Yu. P. Mikhailovskii ◽  
M. L. Toropova ◽  
...  
Keyword(s):  
Gulf Of Finland ◽  
The Gulf Of Finland ◽  
Cumulonimbus Cloud

To the question of the validity of the species Chromadorita arctica Gagarin, 1999 (Nematoda, Chromadorida)

2019 ◽  
Vol 28 (1) ◽  
pp. 194-196
Author(s):  
S.Ya. Tsalolikhin
Keyword(s):  
Gulf Of Finland ◽  
Novaya Zemlya ◽  
The Gulf Of Finland

The synonymization of species Chromadorita arctica Gagarin, 1999, syn. nov. from Novaya Zemlya and Ch. fennica Jensen, 1979 from the Gulf of Finland is proposed.

PROBLEM OF HEAVY METAL SURFACE SEDIMENT CONTAMINATION IN THE EASTERN GULF OF FINLAND

2017 ◽  
Author(s):  
N Derugina ◽  
N Derugina ◽  
А Grigoriev ◽  
A Grigoriev ◽  
Дарья Рябчук ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Bottom Sediments ◽  
Late Holocene ◽  
Sediment Contamination ◽  
Gulf Of Finland ◽  
Slow Decline ◽  
Contamination Levels ◽  
The Gulf Of Finland ◽  
Neva Bay

This project defines the pre-industrial quantities of heavy metals in sediment sequences of the Late Holocene from the Eastern Gulf of Finland. A comparative analysis reveals differences and similarities in the current concentrations of heavy metals in bottom sediments and pre-industrial levels. It is found that the maximum concentrations of heavy metals in the bottom sediments of the Gulf of Finland and Neva Bay occurred in the period of 1950-1990. Since the 1990s, the trend has been a slow decline in the contamination levels; however, the concentrations of some heavy metals in bottom sediments remain high.

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