Believe it or not? The challenge of validating large scale probabilistic risk models

Believe it or not? The challenge of validating large scale probabilistic risk models
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信不信由你?

DOI:
10.1051/e3sconf/20160711004
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发表时间:
2016
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通讯作者:
Sayers P
Sayers P
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Sayers P

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英格兰和威尔士的国家洪水风险评估(NaFRA)最初于2002年进行,此后经常更新。NaFRA已成为洪水风险信息的主要来源,为政策和投资决策提供信息,并向公众和保险公司传达风险。为了根据这些数据做出明智的决策,用户理所当然地需要知道他们可以对这些数据抱有多大的信心。然而,由于破坏性洪水的罕见性和随机性,以及缺乏长期(和广泛)的固定观测记录(不仅反映气候变化,而且反映土地使用和防洪基础设施可能发生的重大变化),无法从传统意义上证实洪水和相关损害的可能性。因此,为了探索NaFRA的有效性,本文对支持方法和数据中的潜在错误进行了自下而上的定性探索。本文最后强调需要进一步研究,以了解如何稳健地验证概率风险模型。
The National Flood Risk Assessment (NaFRA) for England and Wales was initially undertaken in 2002 with frequent updates since. NaFRA has become a key source of information on flood risk, informing policy and investment decisions as well as communicating risk to the public and insurers. To make well informed decisions based on these data, users rightfully demand to know the confidence they can place in them. The probability of inundation and associated damage however cannot be validated in the traditional sense, due the rare and random nature of damaging floods and the lack of a long (and widespread) stationary observational record (reflecting not only changes in climate but also the significant changes in land use and flood defence infrastructure that are likely to have occurred). To explore the validity of NaFRA this paper therefore provides a bottom-up qualitative exploration of the potential errors within the supporting methods and data. The paper concludes by underlining the need for further research to understand how to robustly validate probabilistic risk models.
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