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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Tree-ring based, regional-scale reconstruction of flash floods in Mediterranean mountain torrents
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Tree-ring based, regional-scale reconstruction of flash floods in Mediterranean mountain torrents

机译：基于树圈，地中海洪水的区域规模重建

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摘要

In small mountain catchments of the Mediterranean basin, heavy and intense rainfalls produce frequent flash floods that can cause economic damage and even fatalities in the often densely populated valley areas. To reduce future damage of such events, the application of mitigation strategies aimed at hydrological control and disaster risk reduction is essential. However, to reach this goal, flash flood frequency and magnitude need to be characterized in space and time. This task is highly challenging in areas where existing records are either lacking, short or highly incomplete. In poorly or completely ungauged catchments, tree-ring based flash flood reconstruction has proven useful to overcome this limitation and is now considered a valuable, alternative approach to extend flow records back in time. Tree-ring based reconstructions of past flash floods have been employed widely in many different geographic contexts worldwide, but were less frequently used in Mediterranean torrents, and not at all in Southern Italy so far. Here, we present a regional flash flood reconstruction from five poorly gauged mountain catchments in Calabria (southern Italy) to reconstruct both the timing and the magnitude of five extreme flash flood events of the last 60 years. We show that the return periods of these events ranged between 5 and 30 years based on hydraulic (Manning's equation) and hydrological (rational formula) approaches. Validation of the reconstructed discharge values was done by using direct water depth measurements (obtained from a gauging station). Our results suggest that the combination of different methods allows a reliable reconstruction of extreme hydrological events by easy-to-survey parameters in ungauged torrents of Mediterranean environments. We also demonstrate that tree-ring approaches have the potential to be applied in ungauged (or poorly gauged) Mediterranean mountain catchments as well so as to improve records of the frequency and magnitude of past flash flood activity.
机译：在地中海盆地的小型山地集水区，重度和强烈的降雨量产生频繁的闪光洪水，这可能导致经济损害甚至常长人口稠密的山谷地区的死亡。为减少此类事件的未来损害，减缓策略的应用旨在减少水文控制和减少灾害风险。但是，为了达到这种目标，需要在空间和时间内表征闪光频率和幅度。在现有记录缺乏，短期或高度不完整的地区，这项任务非常具有挑战性。在不良或完全没有凝固的流域，基于树木的闪光重建已经证明是有用的，可以克服这种限制，现在被认为是一种有价值的替代方法来延长流量记录。基于树圈的过去闪蒸洪水的重建在全球许多不同的地理背景下都在广泛的地理上雇用，但在地中海种子中的频率不太常用，而且在意大利南部而不是迄今为止南部。在这里，我们展示了来自卡拉布里亚（意大利南部）的五个糟糕的山地集水区的区域闪光重建，以重建过去60年来的五个极端闪光事件的时间和大小。我们表明，这些事件的返回时期范围为5至30岁，基于液压（曼宁的公式）和水文（理性配方）方法。通过使用直接水深度测量（从衡量站获得）来完成重建的放电值的验证。我们的研究结果表明，不同方法的结合通过易于调查的地中海环境中的易受调查参数可靠地重建极端水文事件。我们还证明树木接近具有在未吞噬（或衡量的）地中海集水区内的潜力，以改善过去闪蒸活动的频率和幅度的记录。

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