Current conditions in the Oslofjord. Focus on current strength along the bottom

GSTDTAP > 气候变化

	Current conditions in the Oslofjord. Focus on current strength along the bottom
	Staalstrøm, Andre; Ghaffari, Peygham
	2015
出版年	2015
语种	英语
国家	挪威
出版者	Norsk institutt for vannforskning
领域	气候变化
英文摘要	The objective of this project has been to assess how strong the current conditions near the bottom can be in extreme cases. Extreme value analysis has been applied to current observations near the bottom at six stations in the Oslofjord. The length of the observation period was up to seven weeks, from mid-September to the end of November 2014. The result from the extreme value analysis was multiplied with safety factor of 1.5 to account for possible additive effects of barotropic and baroclinic forcing. The strongest currents were found where the fjord is relatively narrow, in the Drøbak Sound. This was stations Filtvedt (Km1) and Brenntangen (Kn2), where the extreme value current with a return period of 50 years multiplied with the safety factor was 75 and 99 cm/s, respectively. A more realistic extreme value for these two stations is the result from the extreme value analysis with a return period of 10 years, which were 45 and 59 cm/s for the two stations respectively. The stronger current in the more narrow part of the fjord can be explained by a stronger tidal signal due to the fjord geometry. In both the two transects across the fjord, it was the shallowest stations that had the highest current velocities. This can be explained by the fact that the horizontal pressure gradient has a tendency to decrease with depth.
英文关键词	VDP::Matematikk og naturvitenskap: 400 VDP::Mathematics and natural scienses: 400 Analyse for ekstreme verdier / Extreme value analysis Fjorddynamikk / Fjord dynamics Oslofjorden / Oslo fjord Strømmålinger / Current measurements
URL	查看原文
来源平台	Center for International Climate and Environmental Research-Oslo (CICERO)
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/2034
专题	气候变化
推荐引用方式 GB/T 7714	Staalstrøm, Andre,Ghaffari, Peygham. Current conditions in the Oslofjord. Focus on current strength along the bottom:Norsk institutt for vannforskning,2015.