Trends in flow intermittence for European rivers

Trends in flow intermittence for European rivers
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欧洲河流流量间歇趋势

DOI:
10.1080/02626667.2020.1849708
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发表时间:
2020
影响因子:
3.5
通讯作者:
Tramblay Y
Tramblay Y
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Tramblay Y

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间歇性河流在欧洲许多国家很普遍,但人们对间歇性河流的时间演变及其与气候变异性的关系知之甚少。对1970年至2010年间出现不同程度间歇的452条河流的年和季节零流量天数、最长枯水期和零流量事件的平均日期进行了趋势分析。利用标准化降水蒸散指数(SPEI)和描述大尺度大气环流的气候指数研究了径流间歇与气候的关系。结果表明,间歇的季节模式以及年和季节的零流量日数具有很强的空间变异性,突出了当地集水区特性的控制作用。大多数检测到的趋势表明零流动天数在增加,这种情况也往往发生在今年早些时候,特别是在南欧。在12~24个月的不同积累期内,SPI与超过半数站点的年、季零流量日的出现有很强的相关性。反之,河流间歇性与大尺度环流指数的相关性较弱。总体而言,这些结果表明间歇性河流的水压力增加,这可能会影响它们的生物群和生物化学,并减少可用的水资源。
Intermittent rivers are prevalent in many countries across Europe, but little is known about the temporal evolution of intermittence and its relationship with climate variability. Trend analysis of the annual and seasonal number of zero-flow days, the maximum duration of dry spells and the mean date of the zero-flow events is performed on a database of 452 rivers with varying degrees of intermittence between 1970 and 2010. The relationships between flow intermittence and climate are investigated using the standardized precipitation evapotranspiration index (SPEI) and climate indices describing large-scale atmospheric circulation. The results indicate a strong spatial variability of the seasonal patterns of intermittence and the annual and seasonal number of zero-flow days, highlighting the controls exerted by local catchment properties. Most of the detected trends indicate an increasing number of zero-flow days, which also tend to occur earlier in the year, particularly in southern Europe. The SPEI is found to be strongly related to the annual and seasonal zero-flow day occurrence in more than half of the stations for different accumulation times between 12 and 24 months. Conversely, there is a weaker dependence of river intermittence with large-scale circulation indices. Overall, these results suggest increased water stress in intermittent rivers that may affect their biota and biochemistry and also reduce available water resources.
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