00:20 May 7, 2013 |
Danish to English translations [PRO] Tech/Engineering - Environment & Ecology / Hydrology | |||||||
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| Selected response from: Christine Andersen Denmark Local time: 16:39 | ||||||
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Summary of answers provided | ||||
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5 +1 | present 100-year event |
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3 | around the current level of a hundred-year event or above |
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present 100-year event Explanation: http://staff.acecrc.org.au/~johunter/ipwea_nat_conf_2008.pdf WAYS OF ESTIMATING CHANGES IN SEA-LEVEL EXTREMES UNDER CONDITIONS OF RISING SEA LEVEL - here and on several other sites you will find "present 100-year event" See the explanation in Danish: http://www.klimatilpasning.dk/kommuner/klimatilpasningsplane... For hver oversvømmelsestype estimeres den nuværende styrke, som hændelsen statistisk har, for forskellige gentagelsesperioder. En gentagelsesperiode angiver den periode, der statistisk er mellem hændelser af en vis styrke. Hvis man har 100 målinger fra hvert af de 100 seneste år, vil den største af disse være 100-års hændelsen, den næststørste hændelse vil være 50 års-hændelsen (den viser den styrke, der opnås eller overskrides to gange inden for de 100 målinger), den trejdestørste 33-års hændelsen og så videre. (100 hændelser/rang placering). Eksempel: Det er en god idé ikke kun at se på én gentagelsesperiode, men i stedet at belyse flere forskellige hændelser. Man kan eventuelt lave analysen for 5-, 10-, 20-, 50- og 100-års hændelser, så kortene svarer til de kort, som kan rekvireres fra vandselskaberne. Sandsynligheden for oversvømmelse er 1/T, hvor T=gentagelsesperioden. Sandsynligheden for en 100-års hændelse er altså 0,01. https://www.countyofsb.org/uploadedFiles/pwd/Water/HomeownersGuide_Final.pdf |
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around the current level of a hundred-year event or above Explanation: It is estimated that the total precipitation was around the current level of a hundred-year event or above it. A hundred-year event in this case is the highest level of precipitation in a hundred years. The next-highest in that period is classified as a 50-year event. As statistics only go back to 1955, it is uncertain how severe earlier events were, and whether this is truly a 100-year event. (I remember hearing at the time that if a similar event had occurred over farm land instead of over Copenhagen, the crops would have been ruined and farmers could claim compensation, but the water would have drained off and it would presumably not have been considered a major disaster, as the damage would have been far more limited.) There is an explanation here http://www.ofwat.gov.uk/sustainability/climatechange/rpt_com... The ´nutidig´ or current aspect of the sentence means that these events are expected to become more frequent in some parts of the world, due to climate change, so they may become 20 or 30-year events or even more frequent. There is also archaeological evidence that major storm surges and the like have been more or less frequent in different areas in the past, and come in clusters over a comparatively short period, so there might have been five or six events of the magnitude of a ´current´ 100-year event within a single century. http://www.klimatilpasning.dk/kommuner/klimatilpasningsplane... (Scroll a good way down, to a heading Nutidig og fremtidig styrke af ekstremhændelser) ... Når det nutidige niveau for de forskellige gentagelsesperioder er kendt, kan man på forskellig vis fremskrive data til 2050. Nedbøren ganges med en klimafaktor. http://brs.dk/beredskab/Documents/Redegørelse om skybruddet ... Sorry about the long explanation, but I hope it helps! |
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