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首页> 外文期刊>Hydrology and Earth System Sciences >Evolving flood patterns in a Mediterranean region (1301–2012) and climatic factors – the case of Catalonia
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Evolving flood patterns in a Mediterranean region (1301–2012) and climatic factors – the case of Catalonia

机译：地中海地区（1301＆ndash; 2012）不断演变的洪水模式和气候因素加泰罗尼亚案

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Data on flood occurrence and flood impacts for the last seven centuries inthe northeastern Iberian Peninsula have been analysed in order tocharacterise long-term trends, anomalous periods and their relationship withdifferent climatic factors such as precipitation, general circulation andsolar activity. Catastrophic floods (those that produce complete or partialdestruction of infrastructure close to the river, and major damages in theoverflowed area, including some zones away from the channels) do not presenta statistically significant trend, whereas extraordinary floods (the channelis overflowed and some punctual severe damages can be produced in theinfrastructures placed in the rivercourse or near it, but usually damages are slight) have seena significant rise, especially from 1850 on, and were responsible for thetotal increase in flooding in the region. This rise can be mainly attributedto small coastal catchments, which have experienced a marked increase indeveloped land and population, resulting in changes in land use and greatervulnerability. Changes in precipitation alone cannot explain the variation inflood patterns, although a certain increase was shown in late summer–earlyautumn, when extraordinary floods are most frequently recorded. Therelationship between the North Atlantic circulation and floods is not asstrong, due to the important role of mesoscale factors in heavy precipitationin the northwest of the Mediterranean region. However, it can explain thevariance to some extent, mainly in relation to the catastrophic floodsexperienced during the autumn. Solar activity has some impact on changes incatastrophic floods, with cycles related to the quasi-biennial oscillation(QBO) and the Gleissberg solar cycle. In addition, anomalous periods of high floodfrequency in autumn generally occurred during periods of increased solaractivity. The physical influence of the latter in general circulationpatterns, the high troposphere and the stratosphere, has been analysed inorder to ascertain its role in causing floods.
机译：为了确定长期趋势，异常时期及其与不同气候因素（如降水，总体环流和太阳活动）的关系，对伊比利亚东北半岛最近七个世纪的洪水发生和洪水影响进行了分析。灾难性洪水（那些在河边造成基础设施全部或部分破坏，以及在溢流区域（包括远离河道的某些区域）造成重大破坏的洪水）没有呈现出统计学上的显着趋势，而非常规洪水（河道溢流和一些准时严重破坏）可以在河道或河道附近的基础设施中产生，但通常造成的破坏很小），尤其是从1850年起，尤其是从1850年开始显着上升，是造成该地区洪水泛滥的主要原因。增长主要归因于沿海小流域，这些小流域的发达土地和人口显着增加，从而导致土地用途的变化和更大的脆弱性。尽管在夏末至初夏出现了一定程度的特大洪水，但仅靠降水量的变化就不能解释洪水的变化规律。由于中尺度因素在地中海地区西北部的强降水中起着重要作用，因此北大西洋环流与洪水之间的关系并不那么强烈。但是，它可以在某种程度上解释这种变化，主要是与秋季经历的灾难性洪水有关。太阳活动对灾难性洪水的变化有一些影响，其周期与准两年一次的振荡（QBO）和格莱斯堡气候周期有关。此外，秋季的泛洪频率高的异常时期通常发生在日照活动增加的时期。为了确定其在引发洪水中的作用，已分析了后者在一般对流层，对流层高和平流层中的物理影响。

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