Debris flows and debris floods cause frequent geomorphic hazards, even in the mid‐mountains of Central Europe. In the Hrubý Jeseník Mountains (Eastern Sudetes, Czech Republic), strong anthropogenic interventions have created specific conditions for erosion, transport and accumulation of material released by debris flow/flood events. We present a detailed spatio‐temporal reconstruction of the hydro‐geomorphic process activity in two adjacent sub‐catchments using dendrogeomorphic methods applied to the steep, narrow channels. An analysis of 172 sampled trees [Picea Abies (L.) Karst.] revealed 14 torrential events since 1943 in the Klepáčský stream sub‐catchment and 11 events since 1897 in the Keprnický stream sub‐catchment. Identical events were identified in 1965, 1991, 1997, 2002 and 2010. The event return periods were comparable with return periods from the foothills of the European Alps. A higher frequency of events in the first sub‐catchment may be caused by the presence of a deep‐seated landslide, steeper slopes and a higher susceptibility to shallow slope deformations. Different spatial patterns of events were presented using the Kernel Density analysis in ArcMap 10.1. Clusters of affected trees in the valley floor during the last decades may be due to increased erosion below the check dams and increased accumulation above. The presence of check dams and slope stabilization works since the 1960s has mitigated the processes in several gullies, but due to the current non‐interventional management, the risk of their damage is increasing, particularly when increased activity is observed in the adjacent unprotected gullies.

中文翻译：

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基于树环数据重建的中山山头水文过程的时空特殊性：以赫鲁布·耶塞尼克山（捷克）为例

即使在中欧中部山区，泥石流和泥石流也造成频繁的地貌危害。在赫鲁比耶塞尼克山（捷克共和国东南苏德特斯），强大的人为干预措施为泥石流/洪水事件释放的物质的侵蚀，运输和积累创造了特殊条件。我们使用在陡峭，狭窄通道中应用树状地貌方法，对两个相邻子集水区的水地貌过程活动进行了详细的时空重建。172棵采样树木的分析[ Picea Abies（L.）Karst。]揭示了1943年以来Klepáčský流子汇水区中的14个洪流事件和1897年以来Keprnický流子汇水区中的11个事件。1965年，1991年，1997年，2002年和2010年确定了相同的事件。事件的返回期与欧洲阿尔卑斯山麓的返回期具有可比性。由于深层滑坡，陡峭的斜坡以及对浅层斜坡变形的敏感性较高，可能导致第一子汇水区事件的发生频率较高。使用ArcMap 10.1中的内核密度分析来表示事件的不同空间模式。在过去的几十年中，谷底受影响树木的簇集可能是由于止水坝下方的侵蚀增加以及上方的堆积增加。