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首页> 外文OA文献 >The contrasted evolution of high and low flows and precipitation indices in the duero basin (Spain) Evolution contrastée des crues et des étiages et indices de précipitations dans le bassin du duero (Espagne)
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The contrasted evolution of high and low flows and precipitation indices in the duero basin (Spain) Evolution contrastée des crues et des étiages et indices de précipitations dans le bassin du duero (Espagne)

机译：杜罗盆地（西班牙）高，低流量和降水指数的对比演变西班牙杜罗盆地（西班牙）洪水，低水和降水指数的变化趋势

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[EN] Trends in high and low flows are valuable indicators of hydrological change because they highlight changes in various parts of the frequency distribution of Streamflow series. This enables improved assessment of water availability in regions with high seasonal and inter-annual variability. There has been a substantial reduction in water resources in the Duero basin (Iberian Peninsula, Spain) and other areas of the Mediterranean region during the last 50 years, and this is likely to continue because of climate change. In this study, we investigated the evolution and trends in high and low flows in the Spanish part of the Duero basin, and in equivalent or closelyrelated precipitation indices for the period 1961-2005. The results showed a general trend of decrease in the frequency and magnitude of high flows throughout most of the basin. Moreover, the number of days with low flows significantly increased over this period. No clear relationship was evident between the evolution of high/low flows and changes in the distribution frequencies of the precipitation series. In contrast to what was expected, the number of days with heavy precipitation and the mean annual precipitation did not show significant trends across the basin, and the number of days without rainfall decreased slightly. The divergence between precipitation and runoff evolution was more accentuated in spring and summer. In the absence of trends in precipitation, it is possible that reforestation processes in the region, and increasing temperatures in recent decades, could be related to the decreasing frequency of high flows and the increasing frequency of low flows. © 2012 IAHS Press.
机译：[EN]高流量和低流量趋势是水文变化的重要指标，因为它们突显了水流序列频率分布各部分的变化。这可以改善对季节和年际变化较大的地区的水利用状况的评估。在过去的50年中，杜罗盆地（伊比利亚半岛，西班牙）和地中海地区的其他地区的水资源大量减少，并且由于气候变化，这种情况可能会持续下去。在这项研究中，我们调查了杜罗盆地西班牙部分高流量和低流量的演变和趋势，以及1961-2005年期间同等或密切相关的降水指数。结果表明，在整个盆地的大部分地区，高流量的频率和幅度都有总体下降的趋势。此外，在此期间，流量低的天数显着增加。高/低流量的演变与降水序列分布频率的变化之间没有明显的关系。与预期相反，整个流域的强降水天数和年均降水量没有显着趋势，无降水天数略有减少。春季和夏季降水与径流演变之间的差异更加明显。在没有降水趋势的情况下，该地区的重新造林过程以及最近几十年的气温升高可能与高流量的减少频率和低流量的增加频率有关。 ©2012 IAHS出版社。

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