Accurate estimation of precipitation in mountain catchments is challenging due to its high spatial variability and lack of measured ground data. Weather radar can help to provide precipitation estimates in such conditions. This study investigates the differences between measured and radar-estimated daily precipitation in the mountain catchment of the Jalovecký Creek (area 22 km2, 6 rain gauges at altitudes 815–1900 m a.s.l.) in years 2017–2020. Despite good correlations between measured and radar-based precipitation at individual sites (correlation coefficients 0.68–0.90), the radar-estimated precipitation was mostly substantially smaller than measured precipitation. The underestimation was smaller at lower altitude (on average by –4% to –17% at 815 m a.s.l.) than at higher altitudes (–35% to –59% at 1400–1900 m a.s.l.). Unlike measured data, the radar-estimated precipitation did not show the differences in precipitation amounts at lower and higher altitudes (altitudinal differences). The differences between the measured and radar-estimated precipitation were not related to synoptic weather situations. The obtained results can be useful in preparation of more accurate precipitation estimates for the small mountain catchments.

中文翻译：

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斯洛伐克山区集水区雷达预估降水的准确性

由于山区集水区的高空间变异性和缺乏实测地面数据，因此准确估算山区集水区的降水量具有挑战性。天气雷达可以帮助提供这种情况下的降水量估计。本研究调查了 Jalovecý Creek 山区集水区（面积 22 km2个, 6 个雨量计，海拔 815-1900 米），2017-2020 年。尽管个别站点的实测降水量与基于雷达的降水量之间存在良好的相关性（相关系数为 0.68–0.90），但雷达估计的降水量大多远小于实测降水量。与高海拔地区（海拔 1400-1900 米时平均下降 –35% 到 –59%）相比，低海拔地区的低估幅度较小（在海拔 815 米时平均下降 –4% 到 –17%）。与实测数据不同，雷达估算的降水量没有显示出低海拔和高海拔的降水量差异（海拔差异）。测量和雷达估计的降水量之间的差异与天气情况无关。