ABSTRACT The objective of this study is to quantify the seasonal and multi-annual variability and trends of low-flow river conditions in southeastern Poland. The study was performed using daily values of river discharge at 29 gauging stations for hydrological years 1976–2014. The results show regionally specific patterns, such that seasonality is high for the lowland rivers (low flows occur during the warm season), while in the upland rivers a 10- to 15-year cycle is observed. Increasing trends in warm-season temperature and a decrease in humidity were observed; however, no direct correlation with low flows was found. These results suggest that the initiation and maintenance of low-flow events over some regions are more sensitive to local surface water and groundwater circulation conditions than to atmospheric drivers, especially when the recurrence interval of events is low, and that the primary mechanisms driving and maintaining low-flow conditions can change over relatively small spatial scales.

中文翻译：

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波兰东南部低流量河流状况的多年和季节性变化

摘要 本研究的目的是量化波兰东南部低流量河流状况的季节性和多年变化趋势。该研究使用 1976-2014 年水文年 29 个测站的河流每日流量值进行。结果显示了区域特定的模式，例如低地河流的季节性高（暖季期间流量低），而在高地河流中观察到 10 到 15 年的周期。观察到暖季温度升高和湿度降低的趋势；然而，没有发现与低流量直接相关。这些结果表明，某些地区低流量事件的发生和维持对当地地表水和地下水循环条件比对大气驱动因素更敏感，