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Runoff response at different spatial scales: moving from small experimental areas to mesoscale catchments

机译：不同空间尺度上的径流响应：从小实验区到中尺度流域

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Small experimental catchments represent valuable tools for collection of detailed hydro-meteorological data and conceptualization of hydrological behaviour. Following an upscaling approach, they can also offer insights about the main rainfall-runoff processes occurring at larger scales. This paper aims at assessing whether the runoff generation mechanisms observed in small areas are representative of those occurring in larger basins. We compare the response of four nested catchments ranging from micro-scale to meso-scale in the Italian Dolomites analyzing 54 rainfall-runoff events. A similar threshold effect in the soil moisture-runoff relationship suggests the same processes operating at different scales and denotes the possibility of using hillslope-scale soil moisture measurements as indicators of the moisture conditions of larger areas. The event runoff coefficients are well described by the beta distribution, which reflects the decrease of stormflow with the increase of the watershed size. Thecatchment inter-variability of runoff coefficients are probably related to the watershed topographic properties, mostly in terms of extent of the buffering riparian zone.
机译：小规模的实验流域是收集详细的水文气象数据和水文行为概念化的宝贵工具。采用升级方法之后，他们还可以提供有关较大规模下主要降雨径流过程的见解。本文旨在评估在小区域观测到的径流生成机制是否可以代表在大盆地中发生的径流生成机制。我们比较了意大利白云岩中从微尺度到中尺度的四个嵌套流域的响应，分析了54个降雨径流事件。在土壤水分-径流关系中存在类似的阈值效应，表明相同的过程在不同的规模上运行，并表示有可能使用坡度规模的土壤水分测量值作为较大区域水分状况的指标。 β分布很好地描述了事件径流系数，它反映了暴雨流量随分水岭规模的增加而减少。流域径流系数的汇合变化可能与分水岭的地形特征有关，主要是在河岸带缓冲带的范围上。

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