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Akademický článek

Correlation of wind waves and sea level variations on the coast of the seasonally ice-covered Gulf of Finland

Autor: M. M. Johansson, J.-V. Björkqvist, J. Särkkä, U. Leijala, K. K. Kahma

Publikováno v: Natural Hazards and Earth System Sciences, Vol 22, Pp 813-829 (2022)

Both sea level variations and wind-generated waves affect coastal flooding risks. The correlation of these two phenomena complicates the estimates of their joint effect on the exceedance levels for the continuous water mass. In the northern Baltic Se

Externí odkaz: https://doaj.org/article/82215b41d41b42d6846b01e4d4f609e7

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Akademický článek

Measurement report: Characterization of uncertainties in fluxes and fuel sulfur content from ship emissions in the Baltic Sea

Autor: J. Walden, L. Pirjola, T. Laurila, J. Hatakka, H. Pettersson, T. Walden, J.-P. Jalkanen, H. Nordlund, T. Truuts, M. Meretoja, K. K. Kahma

Publikováno v: Atmospheric Chemistry and Physics, Vol 21, Pp 18175-18194 (2021)

Fluxes of gaseous compounds and nanoparticles were studied using micrometeorological methods at Harmaja in the Baltic Sea. The measurement site was situated beside the ship route to and from the city of Helsinki. The gradient (GR) method was used to

Externí odkaz: https://doaj.org/article/55aec5252b3348b78529da4a56c83ab3

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Akademický článek

Meteotsunami occurrence in the Gulf of Finland over the past century

Autor: H. Pellikka, T. K. Laurila, H. Boman, A. Karjalainen, J.-V. Björkqvist, K. K. Kahma

Publikováno v: Natural Hazards and Earth System Sciences, Vol 20, Pp 2535-2546 (2020)

We analyse changes in meteotsunami occurrence over the past century (1922–2014) in the Gulf of Finland, Baltic Sea. A major challenge for studying these short-lived and local events is the limited temporal and spatial resolution of digital sea leve

Externí odkaz: https://doaj.org/article/68625682a84a4ee38d94d5b9910937bd

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Akademický článek

The wave spectrum in archipelagos

Autor: J.-V. Björkqvist, H. Pettersson, K. K. Kahma

Publikováno v: Ocean Science, Vol 15, Pp 1469-1487 (2019)

Sea surface waves are important for marine safety and coastal engineering, but mapping the wave properties at complex shorelines, such as coastal archipelagos, is challenging. The wave spectrum, E(f), contains a majority of the information about the

Externí odkaz: https://doaj.org/article/ac5a8c67b8534a348c2167ddf90803f5

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Akademický článek

Combining probability distributions of sea level variations and wave run-up to evaluate coastal flooding risks

Autor: U. Leijala, J.-V. Björkqvist, M. M. Johansson, H. Pellikka, L. Laakso, K. K. Kahma

Publikováno v: Natural Hazards and Earth System Sciences, Vol 18, Pp 2785-2799 (2018)

Tools for estimating probabilities of flooding hazards caused by the simultaneous effect of sea level and waves are needed for the secure planning of densely populated coastal areas that are strongly vulnerable to climate change. In this paper we

Externí odkaz: https://doaj.org/article/99f756856d6e48149ff8843dac309766

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Akademický článek

Removing low-frequency artefacts from Datawell DWR-G4 wave buoy measurements

Autor: J.-V. Björkqvist, H. Pettersson, L. Laakso, K. K. Kahma, H. Jokinen, P. Kosloff

Publikováno v: Geoscientific Instrumentation, Methods and Data Systems, Vol 5, Iss 1, Pp 17-25 (2016)

In this study we describe a previously unreported error in the vertical-displacement time series made with GPS-based Datawell DWR-G4 wave buoys and introduce a simple method to correct the resulting wave spectra. The artefact in the time series is fo

Externí odkaz: https://doaj.org/article/47bf1f1569ec49d7b0a5934d1f09713c

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