ABSTRACT The objective of this study is to investigate the factors that control event runoff characteristics at the small catchment scale. The study area is the Hydrological Open Air Laboratory, Lower Austria. Event runoff coefficient (Rc), recession time constant (Tc) and peak discharge (Qp) are estimated from hourly discharge and precipitation data for 298 events in the period 2013–2015. The results show that the Rc and their variability tend to be largest for the tile drainages (mean Rc = 0.09) and the main outlet (mean Rc = 0.08) showing larger Rc in January/February and smaller Rc in July/August. Tc does not vary much between the systems and tends to be largest at the main outlet (mean Tc = 6.5 h) and smallest for the tile drainages (mean Tc = 4.5 h). Groundwater levels explain the temporal variability of Rc and Tc more than soil moisture or precipitation, suggesting a role of shallow flow paths.

中文翻译：

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小型农业流域事件径流特征的时空变异性

摘要 本研究的目的是调查在小流域尺度上控制事件径流特征的因素。研究区域是下奥地利的水文露天实验室。事件径流系数 (Rc)、衰退时间常数 (Tc) 和峰值流量 (Qp) 是根据 2013-2015 年期间 298 次事件的每小时流量和降水数据估算的。结果表明，瓦片排水系统（平均 Rc = 0.09）和主出水口（平均 Rc = 0.08）的 Rc 及其变异性往往最大，1/2 月的 Rc 较大，7/8 月的 Rc 较小。系统之间的 Tc 变化不大，在主出口处趋于最大（平均 Tc = 6.5 小时），而在瓷砖排水系统中最小（平均 Tc = 4.5 小时）。