On the Dynamics of “Almost Equilibrium” Beaches in Semi-sheltered Bays Along the Southern Coast of the Gulf of Finland

Soomere, Tarmo; Healy, Terry R.

doi:10.1007/978-3-642-17220-5_13

Cited by 10 publications

(8 citation statements)

References 29 publications

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“…The latter indicates that specific shore segments may be sensitive to erosion for a particular wave direction only. Small pocket or headland- confined beaches with very small amounts of sand may thus evolve in a step-like manner (Soomere and Healy, 2011).…”

Section: Variability and Change Of Erosion And Sedimentationmentioning

confidence: 99%

“…. A simple consequence of the intermittency and anisotropy of wave fields and the complicated geometry of the coast is that the evolution of Baltic Sea shores is a step-like process (Soomere and Healy, 2011): A few events cause rapid changes when strong waves arrive from specific directions during events with high water levels (Tõnisson et al, 2013b). But for most of the time changes are very slow and require high-resolution measurements such as laser scanning techniques (Eelsalu et al, 2015;Sergeev et al, 2018) to be detected.…”

Section: )mentioning

confidence: 99%

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Sea Level Dynamics and Coastal Erosion in the Baltic Sea Region

Weisse¹,

Dailidienė²,

Hünicke³

et al. 2021

Preprint

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Abstract. There are a large number of geophysical processes affecting sea level dynamics and coastal erosion in the Baltic Sea region. These processes operate on a large range of spatial and temporal scales and are observed in many other coastal regions worldwide. Together with the outstanding number of long data records, this makes the Baltic Sea a unique laboratory for advancing our knowledge on interactions between processes steering sea level and erosion in a climate change context. Processes contributing to sea level dynamics and coastal erosion in the Baltic Sea include the still ongoing visco-elastic response of the Earth to the last deglaciation, contributions from global and North Atlantic mean sea level changes, or from wind waves affecting erosion and sediment transport along the subsiding southern Baltic Sea coast. Other examples are storm surges, seiches, or meteotsunamis contributing primarily to sea level extremes. All such processes have undergone considerable variations and changes in the past. For example, over the past about 50 years, the Baltic absolute (geocentric) mean sea level rose at a rate slightly larger than the global average. In the northern parts, due to vertical land movements, relative sea level decreased. Sea level extremes are strongly linked to variability and changes in the large-scale atmospheric circulation. Patterns and mechanisms contributing to erosion and accretion strongly depend on hydrodynamic conditions and their variability. For large parts of the sedimentary shores of the Baltic Sea, the wave climate and the angle at which the waves approach the nearshore are the dominant factors, and coastline changes are highly sensitive to even small variations in these driving forces. Consequently, processes contributing to Baltic sea level dynamics and coastline change are expected to vary and to change in the future leaving their imprint on future Baltic sea level and coastline change and variability. Because of the large number of contributing processes, their relevance for understanding global figures, and the outstanding data availability, we argue that global sea level research and research on coastline changes may greatly benefit from research undertaken in the Baltic Sea.

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Section: Variability and Change Of Erosion And Sedimentationmentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Sea Level Dynamics and Coastal Erosion in the Baltic Sea Region

Weisse¹,

Dailidienė²,

Hünicke³

et al. 2021

Preprint

Self Cite

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“…Although alterations of natural conditions such as an increase in storminess in the 1960s [24] may have caused increasing loads on Baltic beaches [11], a more probable reason for these changes at Pirita was the human intervention that has cut down the major natural sand supplies to the beach [10], [22].…”

Section: Study Areamentioning

confidence: 99%

“…Thus, differently from the classical examples of bay beaches [9], the bayhead beaches here are only partially sheltered from intense waves. This uplift combined with relatively low but intermittent hydrodynamic activity and limited supply of sand has led to a specific type of ''almost equilibrium'' beaches [10]. They often reveal step-like evolution: slow evolution is interspersed with rare but rapid events that take place when high waves from an unusual direction occur simultaneously with high water levels before or after the ice season [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Combining airborne and terrestrial laser scanning to monitor coastal processes

Julge

Eelsalu

Grünthal

et al. 2014

2014 IEEE/OES Baltic International Symposium (BALTIC)

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This study explores the potential of joint use of terrestrial (TLS) and airborne laser scanning (ALS) to quantify rapid and spatially inhomogeneous changes to the subaerial beach and to characterize the intensity of coastal processes. This remote sensing technology that uses scanning laser pulses for acquiring high-resolution three-dimensional surface of the measured object is applied to beach segment of the Pirita Beach (Tallinn Bay, the Baltic Sea). The extent and distribution of erosion and accumulation spots are analyzed by means of creating and comparing two digital terrain models of these areas from scanning point clouds obtained in different seasons. After elimination of systematic errors the ALS/TLS combination yields sub-decimeter accuracy for height determination of the beach. The analysis reveals not only the corresponding volume changes in the study area but also several features of internal dynamics of the beach across and along the waterline that are overlooked by classical monitoring methods. The benefits and shortcomings of combining the two laser scanning methods for monitoring coastal processes and the accuracy of the results are also discussed.

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“…The combination of its relatively small size, the vulnerability of its ecosystem and comparatively young coasts makes this region extremely susceptible both to climate changes and anthropogenic pressure (Leppäranta and Myrberg, 2009). As this sea has relatively low overall hydrodynamic activity and is almost nontidal, surface waves play an exceptionally great role in the functioning of the entire environment and especially in the course of coastal processes (Soomere and Healy, 2011). The wave fields in this basin are fully separated from those in the Atlantic Ocean and their changes thus largely represent the changes in the local wave generation conditions.…”

Section: Introductionmentioning

confidence: 99%

Long-term spatial variations in the Baltic Sea wave fields

Soomere

Räämet

2011

Ocean Sci.

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Abstract. This study focuses on spatial patterns in linear trends of numerically reconstructed basic wave properties (average and extreme wave heights, wave periods) in the Baltic Sea under the assumption of no ice cover. Numerical simulations of wave conditions for 1970-2007, using the WAM wave model and adjusted geostrophic winds, revealed extensive spatial variations in long-term changes in both average and extreme wave heights in the Baltic Sea but almost no changes in the basinwide wave activity and wave periods. There has been a statistically significant decrease in the annual mean significant wave height by more than 10% between the islands ofÖland and Gotland and in the southward sea area, and a substantial increase to the south-west of Bornholm, near the coast of Latvia, between theÅland Archipelago and the Swedish mainland, and between the Bothnian Sea and the Bothnian Bay. Variations in extreme wave heights (defined as the threshold for 1% of the highest waves each year) show similar patterns of changes. In several areas the trends in average and extreme wave heights are different. Such a complicated pattern of changes indicates that (i) different regions of the Baltic Sea basin have experienced widespread but essentially different changes in wind properties and (ii) many seemingly controversial trends and variations established in wave properties at different sites in the recent past may reflect the natural spatial variability in the Baltic Sea wave fields.

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On the Dynamics of “Almost Equilibrium” Beaches in Semi-sheltered Bays Along the Southern Coast of the Gulf of Finland

Cited by 10 publications

References 29 publications

Sea Level Dynamics and Coastal Erosion in the Baltic Sea Region

Sea Level Dynamics and Coastal Erosion in the Baltic Sea Region

Combining airborne and terrestrial laser scanning to monitor coastal processes

Long-term spatial variations in the Baltic Sea wave fields

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