NDLI: The Effect of Temporal Length of Current Measurements on the Derived Design Level

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The Effect of Temporal Length of Current Measurements on the Derived Design Level

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Arntsen, Martin Borge, Juliane Strømmesen, Ole-Hermann Hansen, Edmond
Copyright Year	2018
Abstract	The duration of current measurements is often short, ranging from a few weeks up to a year. Application of extreme value statistics to derive design levels requires relatively long time series. To mitigate the lack of long-term measurements, the Norwegian standard NS9415 for fish farm design requires the design level of 50-year return period to be derived by multiplication of the current maximum in month-long current measurements by a prescribed conversion factor of 1.85. Here we use twelve data sets of yearlong coastal current measurements to explore the validity of this factor. For each yearlong time series, a design level of 50-year return period is calculated by extreme value statistics and used to calculate estimates of the conversion factor. The mean value of the resulting conversion factor is close to that of NS9415, 1.85 and 1.80 at 5 and 15 m depth, respectively. However, the spread in values is great, both geographically and between months. A conversion factor ranging from 1 to 4 reflects different relative dominance of the driving forces at different coastal regions and different seasons. The absence of a significant seasonal cycle in the conversion factors calculated here, illustrates the difficulty in adjusting for season. The results illustrate and quantify the uncertainty and — often — the lack of conservatism in design levels derived from month long current observations.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
File Format	PDF
ISBN	9780791851272
DOI	10.1115/OMAE2018-77769
Volume Number	Volume 7B: Ocean Engineering
Conference Proceedings	ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2018-06-17
Publisher Place	Madrid, Spain
Access Restriction	Subscribed
Subject Keyword	Design Shorelines Statistics as topic Cycles Uncertainty Time series
Content Type	Text
Resource Type	Article

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