Coastal hydrodynamics beyond the surf zone of the south Baltic Sea

Ostrowski, Rafał; Stella, Magdalena; Szmytkiewicz, Piotr; Kapiński, Jarosław; Marcinkowski, Tomasz

doi:10.1016/j.oceano.2017.11.007

Cited by 14 publications

(6 citation statements)

References 12 publications

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“…With latitude playing a significant role, the VITE exhibits substantial spatial variability across the Southern Baltic Sea (Figure 9). Interestingly, the spatial distribution of reduced VITE areas, as depicted in this study, aligns remarkably well with the regions of upwelling and downwelling identified in the work by Kowalewski and Ostrowski (2005), which focused on coastal up-and downwelling in the southern Baltic. This relationship indicates a strong link between those events and the noted reduction in VITE, implying a dynamic feedback mechanism of the sea to the atmosphere.…”

Section: Discussionsupporting

confidence: 89%

Energy fluxes and vertical heat transfer in the Southern Baltic Sea

Rak,

Przyborska,

Bulczak

et al. 2024

Front. Mar. Sci.

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IntroductionThis study investigates the dynamics of energy fluxes and vertical heat transfer in the Southern Baltic Sea, emphasizing the significant role of the dicothermal layer in modulating the penetration of the thermocline and the propagation rates of thermal energy. The research aims to elucidate the complex patterns of solar energy absorption, its conversion into sea surface temperature (SST), and the transference of this energy deeper into the marine environment.MethodsData were collected through 93 monitoring cruises by the Institute of Oceanology of the Polish Academy of Sciences (IOPAN) from 1998 to 2023, using a high-resolution towed probe technique alongside Argo floats data for the Baltic Proper from 2020 to 2023. ERA5 climate reanalysis dataset and NEMOv4.0 ocean model forecasts were also utilized for a comprehensive analysis of VITE, Top Net Short-Wave Radiation, SST, and energy budget across the Southern Baltic Sea.Results and discussionThe Southern Baltic Sea functions as a net energy sink, with an average energy budget of 5.48 W m-2, predominantly absorbing energy during daylight and emitting it from September to February. A 59-day lag between peak solar energy and VITE peak was observed, followed by an additional 6-day delay before peak SST. The study further reveals a 15-day delay in temperature phase shift per 10 meters depth due to the dicothermal layer's influence on thermal energy propagation, extending to 35 days in the Central and Northern Baltic. Heat transfer is significantly affected by the levels of the thermocline and halocline, with regional variations in advection-driven seasonal signals. The pronounced thermal inertia and the critical role of the dicothermal layer underscore the complexity of thermal energy distribution in the Southern Baltic Sea.

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Section: Discussionsupporting

confidence: 89%

Energy fluxes and vertical heat transfer in the Southern Baltic Sea

Rak,

Przyborska,

Bulczak

et al. 2024

Front. Mar. Sci.

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“…The underestimation of Hallermeier's closure depth could be due to the excessive bottom shear stress caused by the interaction of currents with wave‐induced oscillatory flows. Although wave‐driven currents do not exist outside the surf zone, the sea currents (such as wind drift) could interact with the wave‐driven oscillatory flows, thereby considerably increasing the bed shear stress to start sediment motions, which would not take place if the seabed was affected by the wave oscillatory flows only (Ostrowski et al, ). Based on these observations, Stella et al () recently developed a hypothesis that, under storm conditions, synergic nonlinear interaction of waves and currents could result in distinct nearbed sediment motions at water depths greater than the conventionally defined depth of closure.…”

Section: Introductionmentioning

confidence: 99%

Observation of Rapid Seabed Erosion Near Closure Depth During a Storm Period at Hujeong Beach, South Korea

Dae

Jin

Jeong

et al. 2019

Geophysical Research Letters

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We report extraordinary seabed erosion that occurred at a depth of ~8.3 m at Hujeong Beach, South Korea. The seabed was eroded for 0.7 m during a ~2.3‐day period under storm conditions. The maximum significant wave height was ~3.8 m, which was unexpected considering the traditional closure depth concept. Four storm events were recorded within 36 day of the experimental period, but the severe erosion only occurred during the first storm. The erosion started when the nearbed flow velocity rapidly increased to reach its maximum at 0.27 m/s, and it continued until this velocity remained at its maximum. Additional factors responsible for the unanticipated erosion process were the current and wave skewness. The erosion was facilitated when the current direction was actively changing and the magnitude of positive skewness increased during the storm period. These factors are likely to have intensified the nearbed flow turbulence and bed shear stress.

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“…The open-sea side shoreline is even and there are mostly two sandbars in the nearshore zone. Besides sandbars, the shore gently slopes down to the northeast and the mean depth gradient is around 0.015 [35].…”

Section: Study Areamentioning

confidence: 99%

Spatio-Temporal Morphodynamics of a Nourished Sandy Shore Based on LiDAR Measurements

Harenda,

Dudkowska,

Szmytkiewicz

2024

Water

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Coastal erosion is a pervasive global phenomenon, exemplified by the Hel Peninsula situated in the Gulf of Gdańsk, the southern Baltic Sea. The geological constitution of the Hel Peninsula, characterized by sandy and loosely consolidated material, predisposes its coastal zones to continual morphological changes. The peninsula’s limited width and elevation exacerbate shoreline erosion, particularly during periods of heightened storm activity. This study scrutinizes the effectiveness of coastal nourishment interventions, with a specific focus on segments influenced by the Władysławowo port and the Kuźnica vicinity, over several years. This specific section of the coast serves as a significant case study due to its role as a transit zone for sand transport along the whole peninsula. Protective measures, including shore nourishments and coastal groynes, aim to mitigate erosion impacts. Utilizing Airborne Laser Scanning (ALS) data spanning from 2008 to 2022, erosion dynamics were analyzed. The analysis reveals significant erosion patterns coinciding with the frequency and volume of nourishment material deposition, particularly evident in heavily nourished areas proximate to Władysławowo and Kuźnica. Despite persistent monitoring endeavors, persistent erosive trends pose imminent threats to Kuźnica’s infrastructure, necessitating further research into the efficacy of implemented coastal protection measures.

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Coastal hydrodynamics beyond the surf zone of the south Baltic Sea

Cited by 14 publications

References 12 publications

Energy fluxes and vertical heat transfer in the Southern Baltic Sea

Energy fluxes and vertical heat transfer in the Southern Baltic Sea

Observation of Rapid Seabed Erosion Near Closure Depth During a Storm Period at Hujeong Beach, South Korea

Spatio-Temporal Morphodynamics of a Nourished Sandy Shore Based on LiDAR Measurements

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