Large wood (LW) found in both the river channel and the floodplain significantly influences geomorphic processes in the fluvial corridor and plays a vital role in ecological processes. In this study, we investigate the spatial distribution, characteristics, and sources of LW within the entire fluvial corridor of the actively meandering Odra River in Czechia. This region has been subject to long-term human influences on the riverine landscape. We observed notable variations in LW volume throughout the studied fluvial corridor. The highest LW volume was detected in hardwood forested areas in the high floodplain segments, registering at 39.35 m³/ha. This volume was approximately four times greater than the average LW volume found in other areas, including softwood forested patches and low floodplain segments. In contrast, the lowest LW volume was recorded in the low-flow channel, at 4.32 m³/ha. A significant portion of the floodplain LW originated in-situ, as opposed to being deposited during flooding or through beaver activities; these latter two sources typically contributed smaller pieces of LW. The spatial analysis of LW distribution indicated higher densities in the high floodplain within hardwood floodplain forests, especially in regions affected by bank erosion. Additional hotspots of LW occurrence were identified in the low floodplain, which are primarily associated with sites where LW is preferentially deposited during high-flow events, or with spatially-limited areas impacted by beaver activity. The study also offers guidelines for LW management in the fluvial corridors of large meandering rivers, focusing on increasing floodplain geodiversity and addressing potential flood risks associated with the recruitment and subsequent transport of floodplain LW.

中文翻译：

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活跃蜿蜒河流的河流廊道中的漫滩和河道内大型木材储存库

河道和洪泛区发现的大木材（LW）对河流廊道的地貌过程有显着影响，在生态过程中发挥着至关重要的作用。在这项研究中，我们调查了捷克活跃蜿蜒的奥得河整个河流走廊内 LW 的空间分布、特征和来源。该地区的河流景观长期受到人类影响。我们观察到整个研究河流走廊的 LW 体积存在显着变化。在高洪泛区的阔叶林地区检测到最高的 LW 量，为 39.35 立方米/公顷。该体积大约比其他地区发现的平均 LW 体积大四倍，包括软木森林斑块和低漫滩部分。相比之下，低流量渠道记录的最低 LW 体积为 4.32 立方米/公顷。洪泛区 LW 的很大一部分源自原地，而不是在洪水期间或通过海狸活动沉积；后两个来源通常贡献较小的 LW 部分。LW 分布的空间分析表明，阔叶林漫滩内的高漫滩密度较高，特别是在受河岸侵蚀影响的地区。在低漫滩中发现了 LW 发生的其他热点，这些热点主要与高流量事件期间 LW 优先沉积的地点或受海狸活动影响的空间有限区域相关。该研究还为大型蜿蜒河流的河流走廊的 LW 管理提供了指导，重点是增加洪泛区的地理多样性，并解决与洪泛区 LW 的补充和后续运输相关的潜在洪水风险。