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・ Return of the Vampire
・ Return of the Wu & Friends
・ Return of Toofan Mail
・ Return of Wax
・ Return of writs
・ Return on assets
・ Return on capital
・ Return on capital employed
・ Return on Change
・ Return on equity
・ Return on event
・ Return on investment
・ Return on marketing investment
・ Return on net assets
・ Return on tangible equity
Return period
・ Return Point
・ Return ratio
・ Return receipt
・ Return Sludge Pumping Station, Fields Point Sewage Treatment Plant
・ Return specialist
・ Return statement
・ Return stroke (disambiguation)
・ Return Textiles
・ Return the Favor
・ Return the Pearl to Thee
・ Return Ticket
・ Return to Action
・ Return to Babylon
・ Return to Base


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Return period : ウィキペディア英語版
Return period
A return period, also known as a recurrence interval (sometimes repeat interval) is an estimate of the likelihood of an event, such as an earthquake, flood or a river discharge flow to occur. It is a statistical measurement typically based on historic data denoting the average recurrence interval over an extended period of time, and is usually used for risk analysis (e.g. to decide whether a project should be allowed to go forward in a zone of a certain risk, or to design structures to withstand an event with a certain return period). The following analysis assumes that the probability of the event occurring does not vary over time and is independent of past events.
==Equation==
Recurrence interval =
:''n'' number of years on record;
:''m'' is the number of recorded occurrences of the event being considered
For floods, the event may be measured in terms of m³/s or height; for storm surges, in terms of the height of the surge, and similarly for other events.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Return period」の詳細全文を読む



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