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On the effect of the sampling frequency of sea level measurements on return period estimate of extremes—Southern European examples

On the effect of the sampling frequency of sea level measurements on return period estimate of extremes—Southern European examples
On the effect of the sampling frequency of sea level measurements on return period estimate of extremes—Southern European examples
Estimates of extreme sea levels and return periods have been based mainly on hourly sampling rates. Technological development has enabled the sampling rates to increase and sampling rates of 5–10 min are becoming increasingly common. In this paper we explore the relationship between extreme sea levels and estimated return periods based on hourly and shorter sampling periods in three tide-gauges one at the Atlantic coasts of Spain (Coruña), one in the western Mediterranean (Malaga) and one in the N. Adriatic (Trieste). Significant differences of several centimetres are found in the hourly and 5 min extremes. These reflect in significant underestimation of the 50-year return levels which in Trieste reach 38 cm. A theoretical relationship between the high and the low sampling rate of extremes is also tested. Thus updated 50-year return levels for the Mediterranean and the coasts of the Iberian peninsula are produced assuming that the differences identified in the various stations generalise to other tide-gauge (hourly) records for which hourly values have been analysed earlier.
Sea level, Extremes, Sampling rates, Return levels, Mediterranean, Adriatic
0278-4343
2214-2221
Tsimplis, M.N.
df6dd749-cda4-46ec-983c-bf022d737031
Marcos, M.
3cd7a6cd-def3-47a9-a7c4-7ef305fc0bf1
Pérez, B.
7a5b4b1f-2436-4733-9db2-c8490565d0c2
Challenor, P.
a7e71e56-8391-442c-b140-6e4b90c33547
Garcia-Fernandez, M.J.
f139a4cd-ff43-47c1-8941-12314abeabf2
Raicich, F.
3c451c3e-4a1b-441c-a13b-8d28ee4fdd3b
Tsimplis, M.N.
df6dd749-cda4-46ec-983c-bf022d737031
Marcos, M.
3cd7a6cd-def3-47a9-a7c4-7ef305fc0bf1
Pérez, B.
7a5b4b1f-2436-4733-9db2-c8490565d0c2
Challenor, P.
a7e71e56-8391-442c-b140-6e4b90c33547
Garcia-Fernandez, M.J.
f139a4cd-ff43-47c1-8941-12314abeabf2
Raicich, F.
3c451c3e-4a1b-441c-a13b-8d28ee4fdd3b

Tsimplis, M.N., Marcos, M., Pérez, B., Challenor, P., Garcia-Fernandez, M.J. and Raicich, F. (2009) On the effect of the sampling frequency of sea level measurements on return period estimate of extremes—Southern European examples. Continental Shelf Research, 29 (18), 2214-2221. (doi:10.1016/j.csr.2009.08.015).

Record type: Article

Abstract

Estimates of extreme sea levels and return periods have been based mainly on hourly sampling rates. Technological development has enabled the sampling rates to increase and sampling rates of 5–10 min are becoming increasingly common. In this paper we explore the relationship between extreme sea levels and estimated return periods based on hourly and shorter sampling periods in three tide-gauges one at the Atlantic coasts of Spain (Coruña), one in the western Mediterranean (Malaga) and one in the N. Adriatic (Trieste). Significant differences of several centimetres are found in the hourly and 5 min extremes. These reflect in significant underestimation of the 50-year return levels which in Trieste reach 38 cm. A theoretical relationship between the high and the low sampling rate of extremes is also tested. Thus updated 50-year return levels for the Mediterranean and the coasts of the Iberian peninsula are produced assuming that the differences identified in the various stations generalise to other tide-gauge (hourly) records for which hourly values have been analysed earlier.

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More information

Published date: 15 October 2009
Keywords: Sea level, Extremes, Sampling rates, Return levels, Mediterranean, Adriatic

Identifiers

Local EPrints ID: 69521
URI: http://eprints.soton.ac.uk/id/eprint/69521
ISSN: 0278-4343
PURE UUID: e1ed0eae-3472-4105-8d8d-318884fbab23

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Date deposited: 06 Nov 2009
Last modified: 13 Mar 2024 19:35

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Contributors

Author: M.N. Tsimplis
Author: M. Marcos
Author: B. Pérez
Author: P. Challenor
Author: M.J. Garcia-Fernandez
Author: F. Raicich

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