scholarly journals What can seabirds tell us about the tide?

Ocean Science ◽  
2018 ◽  
Vol 14 (6) ◽  
pp. 1483-1490 ◽  
Author(s):  
Matthew Cooper ◽  
Charles Bishop ◽  
Matthew Lewis ◽  
David Bowers ◽  
Mark Bolton ◽  
...  
Keyword(s):  
Geographical Area ◽  
Quantitative Information ◽  
Tidal Currents ◽  
Irish Sea ◽  
Maximum Speed ◽  
Small Data ◽  
Data Set ◽  
Alca Torda ◽  
The Irish Sea ◽  
Mean Square Difference

Abstract. Small global positioning system (GPS) trackers are now routinely used to study the movement and behaviour of birds at sea. If the birds rest on the water they become “drifters of opportunity” and can be used to give information about surface currents. In this paper, we use a small data set from satellite-tracked razorbills (Alca torda) in the Irish Sea to test the potential of this idea for measuring tidal currents. Razorbills regularly rest on the sea overnight and their tracks at this time are consistent with their drifting with the tidal flows and changing direction as the flood turns to ebb and vice versa. Data from 4 years (2011–2014) have been binned in a geographical grid and analysed to give the variation of current over a mean tidal cycle in each grid element. A map of maximum current speed is consistent with a numerical model of the tidal currents in the region. The root mean square difference between observed maximum speed and that predicted by the model is 0.15 m s−1, about 15 % of typical current speeds in the area. The divergence between bird-track speed and model prediction increases in regions of the fastest tidal currents. The method clearly has its limitations, but the results of this study show that tagged birds resting on the sea have potential to provide relatively inexpensive quantitative information about surface tidal currents over an extended geographical area.

scholarly journals What can seabirds tell us about the tide?

2018 ◽  
Author(s):  
Matthew Cooper ◽  
Charles Bishop ◽  
Matthew Lewis ◽  
David Bowers ◽  
Mark Bolton ◽  
...  
Keyword(s):  
Geographical Area ◽  
Quantitative Information ◽  
Tidal Currents ◽  
Current Speed ◽  
Irish Sea ◽  
Maximum Speed ◽  
Small Data ◽  
Data Set ◽  
The Irish Sea ◽  
Tidal Streams

Abstract. Small GPS trackers are now routinely used to study the movement and behaviour of birds at sea. If the birds rest on the water they become drifters of opportunity and can be used to give information about surface currents. In this paper, we use a small data set from satellite-tracked razorbills (Alca torda) in the Irish Sea to test the potential of this idea for measuring tidal streams. Razorbills regularly rest on the sea overnight and their tracks at this time are consistent with them drifting with the tidal flows and changing direction as the flood turns to ebb. Data from four years (2011–2014 inclusive) have been binned in a geographical grid and analysed to give the variation of current speed over a mean tidal cycle in each grid element. A map of maximum current speed is consistent with a numerical model of the tidal currents in the region. The root-mean-square difference between observed maximum speed and that predicted by the model is 0.15 m s−1, about 15 % of typical current speeds in the area. The divergence between bird-track speed and model prediction increases in regions of fastest tidal streams. The method clearly has its limitations, but the results of this study show that tagged birds resting on the sea have great potential for providing relatively inexpensive quantitative information about surface tidal currents over an extended geographical area.

scholarly journals EXTREME WAVE PREDICTION USING DIRECTIONAL DATA

1986 ◽  
Vol 1 (20) ◽  
pp. 11
Author(s):  
M.C. Deo ◽  
R. Burrows
Keyword(s):  
Directional Data ◽  
Irish Sea ◽  
Data Set ◽  
Wave Data ◽  
The North ◽  
Wave Heights ◽  
Directional Wave ◽  
The Irish Sea ◽  
Height Predictions

Potential inconsistencies in the predictions of long term wave heights can be experienced as a result of different methods of analysis possible when using directional wave data. This paper attempts to illustrate some of them. It involves analysis of two sets of directional wave data - one froa a coastal location in the Irish Sea and another from an offshore location in the North Sea. An attempt is made to eliminate the discrepancies between the long term return-value wave height predictions based upon the conditional height distributions associa ted with different direction sectors and those derived from the oonl-directional data set.

Types of Megalithic Monuments of the Irish Sea and North Channel Coastlands: A Study in Distributions

1945 ◽  
Vol 25 (3-4) ◽  
pp. 125-144 ◽  
Author(s):  
Margaret Davies
Keyword(s):  
Western Europe ◽  
Tidal Currents ◽  
Irish Sea ◽  
Bare Rock ◽  
Vital Importance ◽  
Long Period ◽  
Different Types ◽  
Forested Areas ◽  
The Irish Sea

The megalithic cult of southern and western Europe appears to have been largely seaborne. It was spread in western Britain, too, by a people who used the northern sections of the Atlantic route. This paper deals with the distributions of different types of megalith in the Irish Sea basin and in its northward extension. It describes the burial and ceremonial monuments of the lands which front on to a mainly land-locked sea. The routeways of the Irish Sea were used to diffuse the megalithic cult over a long period, and the better favoured coastlands attracted large colonies of megalith builders (see fig. i) comparable in size to those of any section of the Atlantic route. The controlling geographical features such as tidal currents and their influence on routeways; or diffusion in relation to areas of lighter soil, or patches of bare rock, or wind-swept coastlands (i.e. the less densely forested areas); are of vital importance, and will be discussed elsewhere.

Re-analysis of an Historical Benthic Data Set from the Irish Sea

1998 ◽  
Vol 46 (5) ◽  
pp. 769-776 ◽  
Author(s):  
D. Pennington ◽  
L.O. Veale ◽  
R.G. Hartnoll
Keyword(s):  
Irish Sea ◽  
Data Set ◽  
The Irish Sea

The medieval cultures of the Irish sea and the North Sea: Manannan and his neighbors [Book Review]

2019 ◽  
Vol 15 ◽  
pp. 142-144
Author(s):  
John Kennedy
Keyword(s):  
North Sea ◽  
Irish Sea ◽  
The North ◽  
The North Sea ◽  
The Irish Sea

Review(s) of: The medieval cultures of the Irish sea and the North Sea: Manannan and his neighbors, by MacQuarrie, Charles W., and Nagy, Joseph Falaky Nagy (eds), (Amsterdam: Amsterdam University Press, 2019) hardcover, 212 pages, 1 map, 4 figures, RRP euro99; ISBN 9789462989399.

The Lyapunov Exponent Variance of an Electronic Manufacturing Enterprise’s Daily Qualified Rate Time Series by Improved Small Data Sets Approach

2012 ◽  
Vol 197 ◽  
pp. 271-277
Author(s):  
Zhu Ping Gong
Keyword(s):  
Time Series ◽  
Lyapunov Exponent ◽  
Chaotic Time Series ◽  
Quality System ◽  
Quality Level ◽  
Largest Lyapunov Exponent ◽  
Small Data ◽  
Data Set ◽  
Electronic Manufacturing ◽  
Small Data Set

Small data set approach is used for the estimation of Largest Lyapunov Exponent (LLE). Primarily, the mean period drawback of Small data set was corrected. On this base, the LLEs of daily qualified rate time series of HZ, an electronic manufacturing enterprise, were estimated and all positive LLEs were taken which indicate that this time series is a chaotic time series and the corresponding produce process is a chaotic process. The variance of the LLEs revealed the struggle between the divergence nature of quality system and quality control effort. LLEs showed sharp increase in getting worse quality level coincide with the company shutdown. HZ’s daily qualified rate, a chaotic time series, shows us the predictable nature of quality system in a short-run.

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