Applicability of an empirical law to predict significant sea-wave heights from microseisms along the Western Ligurian Coast (Italy)

2016 ◽  
Vol 122 ◽  
pp. 36-42 ◽  
Author(s):  
Gabriele Ferretti ◽  
Davide Scafidi ◽  
Laura Cutroneo ◽  
Stefano Gallino ◽  
Marco Capello
Keyword(s):  
Empirical Law ◽  
Wave Heights ◽  
Ligurian Coast ◽  
Sea Wave

scholarly journals Long-term spatial variations in the Baltic Sea wave fields

Ocean Science ◽  
2011 ◽  
Vol 7 (1) ◽  
pp. 141-150 ◽  
Author(s):  
T. Soomere ◽  
A. Räämet
Keyword(s):  
Baltic Sea ◽  
Spatial Variations ◽  
Extreme Wave ◽  
The Baltic Sea ◽  
Wave Fields ◽  
Wave Heights ◽  
The Baltic ◽  
Wave Properties ◽  
Sea Wave

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 of Öland and Gotland and in the southward sea area, and a substantial increase to the south-west of Bornholm, near the coast of Latvia, between the Åland 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.

The Bivariate Distribution of Wave Heights and Periods in Mixed Sea States

1999 ◽  
Vol 121 (2) ◽  
pp. 102-108 ◽  
Author(s):  
G. Rodri´guez ◽  
C. Guedes Soares
Keyword(s):  
Bivariate Distribution ◽  
Dimensionless Parameters ◽  
Wave Heights ◽  
Probabilistic Structure ◽  
Two Parameters ◽  
Sea Wave

The probabilistic structure of the bivariate distribution of sea wave heights and periods in sea states with two-peaked spectra is examined by means of numerically simulated wave records. Two-peaked sea states are classified in nine representative groups, in terms of two dimensionless parameters. The asymmetric and bimodal nature of the distribution is examined for each one of these two parameters.

Decadal changes in the Baltic Sea wave heights

2014 ◽  
Vol 129 ◽  
pp. 86-95 ◽  
Author(s):  
Tarmo Soomere ◽  
Andrus Räämet
Keyword(s):  
Baltic Sea ◽  
The Baltic Sea ◽  
Wave Heights ◽  
The Baltic ◽  
Sea Wave

scholarly journals On microseisms recorded near the Ligurian coast (Italy) and their relationship with sea wave height

2013 ◽  
Vol 194 (1) ◽  
pp. 524-533 ◽  
Author(s):  
G. Ferretti ◽  
A. Zunino ◽  
D. Scafidi ◽  
S. Barani ◽  
D. Spallarossa
Keyword(s):  
Wave Height ◽  
Ligurian Coast ◽  
Sea Wave

scholarly journals An Extended Poisson test for Detecting the Difference Between the Past and Future Rates of Extremes of Sea wave Heights

2015 ◽  
Vol 116 ◽  
pp. 583-591 ◽  
Author(s):  
Toshikazu Kitano ◽  
Sivaranjani Jayaprasad ◽  
Wataru Kioka
Keyword(s):  
The Past ◽  
Wave Heights ◽  
The Difference ◽  
Sea Wave

scholarly journals Long-term spatial variations in the Baltic Sea wave fields

2010 ◽  
Vol 7 (6) ◽  
pp. 1889-1912
Author(s):  
T. Soomere ◽  
A. Räämet
Keyword(s):  
Baltic Sea ◽  
Spatial Variations ◽  
Extreme Wave ◽  
The Baltic Sea ◽  
Wave Fields ◽  
Wave Heights ◽  
The Baltic ◽  
Wave Properties ◽  
Sea Wave

Abstract. This study focuses on spatial patterns in linear trends of numerically reconstructed basic wave properties (average and extreme wave heights, wave period) in the Baltic Sea. 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 of Öland and Gotland and in the southward sea area, and a substantial increase to the south-west of Bornholm, near the coast of Latvia, between Åland 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.

scholarly journals HEIGHT DISTRIBUTION OF ESTUARINE WAVES

1982 ◽  
Vol 1 (18) ◽  
pp. 9
Author(s):  
V. Barthel
Keyword(s):  
North Sea ◽  
Rayleigh Distribution ◽  
Wave Climate ◽  
Field Investigation ◽  
Height Distribution ◽  
Empirical Distributions ◽  
The North ◽  
Wave Heights ◽  
The North Sea ◽  
Sea Wave

A field investigation program on waves was carried out in the Weser estuary, German Bight of the North Sea. Wave height and period distributions in this complicated wave climate can be approximated by a Rayleigh distribution. Empirical distributions of the wave heights characterise the different regions of the estuary. The presence of wave grouping as well as the group bounded long waves are shown in a few examples. The necessity of further investigations and analysis is highlighted.

scholarly journals Wave height and period on 16 March, 21 April, and 22 September 2019, in the Ujung Batee coastal waters and Lampanah coastal waters, Aceh Besar District, Indonesia

2021 ◽  
Vol 869 (1) ◽  
pp. 012040
Author(s):  
I Setiawan ◽  
S M Yuni ◽  
M Ulfah ◽  
S Purnawan ◽  
H A Haridhi ◽  
...  
Keyword(s):  
Wave Height ◽  
Coastal Waters ◽  
Measurement Data ◽  
Research Station ◽  
Wave Data ◽  
Wave Measurements ◽  
Wave Measurement ◽  
Wave Heights ◽  
Station Location ◽  
Sea Wave

Abstract Waves are one of the sea parameters that affect the rate of retreat of the coastline. This research investigation was carried out in the coastal waters of Ujong Batee and Lampanah, Aceh Besar District on 16 March, 21 April, and 22 September 2019, with the aim of examining wave parameters, namely wave height and period. Then the wave measurement data sampled at the research station location was carried out by purposive random sampling method. Sea wave data were taken using a scale board that has been labeled with numbers and a stopwatch. Wave measurements were carried out approximately 1000 times. Then the sea wave data is processed to obtain the wave height and period and then analyzed. The results obtained that the wave heights on 16 March, 21 April, and 22 September 2019 were 67 cm, 83 cm, and 80 cm in Ujong Batee and 55 cm, 67 cm, and 66 cm in Lampanah. While the wave period is 12 seconds on March 16, April 21, and September 22 in Ujong Batee and Lampanah. Thus, the wave height and period at both locations ranged from 50 cm to 80 cm and 12 s.

Parameters of the air-sea interface by high-frequency ground-wave Doppler radar

1985 ◽  
Vol 36 (5) ◽  
pp. 655 ◽  
Author(s):  
ML Heron ◽  
PE Dexter ◽  
BT McGann
Keyword(s):  
Root Mean Square ◽  
Wave Spectrum ◽  
Second Order ◽  
Surface Currents ◽  
Mean Square ◽  
Square Wave ◽  
Wind Speeds ◽  
Wave Heights ◽  
Ground Wave ◽  
Sea Wave

A 30-MHz ground-wave ocean surface radar has been deployed inside the Great Barrier Reef where the water is sheltered from ocean swell. The spatial resolution of the radar is 3 km radially and 3.5� in azimuth. In each cell a 102.4-s time series is used to determine radial surface currents, wind directions, root- mean-square wave heights and wind speeds. Coincident observations of sea-wave spectra, surface currents and boundary-layer winds are used to evaluate the radar performance and to modify some of the methods of data analysis to suit these conditions. Surface current values are observed by the radar to an accuracy of �0.05 m s-1, wind directions to �10� , root-mean-square wave heights to 0.15 m and wind speeds to �3 m s-1. In some spectra, the peak in the second-order continuum caused by the non-directional sea- wave spectrum is not resolved from a second-order resonance line. This disallows the derivation of the period of the dominant sea wave on a routine basis.

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