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High-spatial-resolution probability maps of drought duration and magnitude across Spain

机译:西班牙干旱持续时间和幅度的高空间分辨率概率图

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Assessing the probability of occurrence of drought is important for improving current drought assessment, management and mitigation measures, and strategies across Spain. This study employed two well-established drought indices, the Standardized Precipitation Index (SPI) and the Standardized Precipitation Evapotranspiration Index (SPEI), to characterize drought duration and magnitude at different timescales over Spain. In order to map the drought hazard probability, we applied the extreme value theory and tested different thresholds to generate peak-over-threshold (POT) drought duration and magnitude series. Our results demonstrate that the generalized Pareto (GP) distribution performs well in estimating the frequencies of drought magnitude and duration. Specifically, we found a good agreement between the observed and modelled data when using upper percentiles to generate the POT series. Spatially, our estimations suggest a higher probability of extreme drought events in southern and central Spain compared to the northern and eastern regions. Also, our study found spatial differences in drought probability estimations as a function of the selected drought index (i.e. SPI vs. SPEI) and timescale (i.e. 1, 3, 6, and 12 months). Drought hazard probability maps can contribute to the better management of different sectors (e.g. agriculture, water resources management, urban water supply, and tourism) at national, regional, and even local scale in Spain.
机译:评估干旱发生的可能性对于改善目前的干旱评估,管理和缓解措施以及西班牙的策略非常重要。本研究采用了两种完善的干旱指数,标准化降水指数(SPI)和标准化沉淀蒸馏蒸腾指数(SPEI),以在西班牙的不同时间尺寸下表征干旱持续时间和大小。为了映射干旱危险概率,我们应用了极值理论并测试了不同阈值以产生峰值过阈值(盆)干旱持续时间和幅度系列。我们的结果表明,广义帕累托(GP)分布在估计干旱幅度和持续时间的频率时表现良好。具体而言,我们在使用上百分位产生罐系列时,我们在观察和建模数据之间找到了良好的一致性。空间上,与北部和东部地区相比,我们的估计表明南部和中部地区的极端干旱事件的概率更高。此外,我们的研究发现了作为所选干旱指数的函数(即SPI与SPEI)和时间尺度(即1,3,6和12个月)的函数的空间概率估计的空间差异。干旱危险概率地图可以促进西班牙国家,区域,甚至局部规模的不同部门(例如农业,水资源管理,城市供水和旅游)的更好管理。

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