Frequency and Spatial Variability of European Record Floods

IF 4.6 1区 地球科学 Q2 ENVIRONMENTAL SCIENCES
M. Bertola, A. Castellarin, A. Viglione, E. Valtancoli, G. Blöschl
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引用次数: 0

Abstract

Regional envelope curves (RECs) have been used to characterize the flooding potential of regions worldwide. However, a comprehensive assessment for Europe is still missing. In this study we use the largest European flood database to quantify the magnitude of record floods, their dependence on catchment size, and the amount of available independent information, which is needed for estimatinig the REC's exceedance probability. We propose a framework for estimating REC parameters across large areas, consisting in partitioning the domain according to the observation density and estimating the REC slope through quantile regression. The results show that the REC parameters vary substantially across Europe. The envelope unit flood associated with a catchment area of 1,000 km2 varies between 0.1 and 6 m3s−1 km−2 and is highest in Mediterranean and Alpine areas and lowest in central-eastern Europe. The slope of the envelope varies between 0 and −1 and is larger in Southern Europe than in Northern Europe. These differences are explained by steeper landscape in mountaineous regions and localized short duration storms producing large floods in small catchments in the Mediterranean, whose intensities are larger than in other parts of Europe. Based on the framework of probabilistic envelope curves we show that, despite the uneven observation density, the obtained RECs are associated with comparable exceedance probabilities.
欧洲创纪录洪水的频率和空间变异性
区域包络曲线 (REC) 已被用于描述世界各地区的洪水潜力。然而,欧洲仍然缺少全面的评估。在这项研究中,我们利用欧洲最大的洪水数据库来量化有记录的洪水的规模、其与流域面积的关系以及可用的独立信息量,这些都是估算区域包络曲线超标概率所必需的。我们提出了一个估算大面积 REC 参数的框架,包括根据观测密度划分区域,并通过量子回归估算 REC 坡度。结果表明,欧洲各地的 REC 参数差异很大。与 1,000 平方公里流域面积相关的包络单元洪水介于 0.1 至 6 m3s-1 km-2 之间,在地中海和阿尔卑斯地区最高,在中东欧最低。包络线的斜率介于 0 和 -1 之间,南欧的斜率大于北欧。造成这些差异的原因是,山区地势较陡,地中海地区的局部短时暴雨在小型集水区产生了大洪水,其强度大于欧洲其他地区。基于概率包络曲线框架,我们表明,尽管观测密度不均衡,但所获得的 RECs 与超标概率相当。
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来源期刊
Water Resources Research
Water Resources Research 环境科学-湖沼学
CiteScore
8.80
自引率
13.00%
发文量
599
审稿时长
3.5 months
期刊介绍: Water Resources Research (WRR) is an interdisciplinary journal that focuses on hydrology and water resources. It publishes original research in the natural and social sciences of water. It emphasizes the role of water in the Earth system, including physical, chemical, biological, and ecological processes in water resources research and management, including social, policy, and public health implications. It encompasses observational, experimental, theoretical, analytical, numerical, and data-driven approaches that advance the science of water and its management. Submissions are evaluated for their novelty, accuracy, significance, and broader implications of the findings.
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