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Mechanism of maintaining cobble-bar vegetation and the geomorphic conditions for existence of refugia during large floods
Journal of Hydro-environment Research ( IF 2.8 ) Pub Date : 2020-03-06 , DOI: 10.1016/j.jher.2020.03.003
Akihiko Nakayama , Kayo Asami

In order to understand the mechanism of preserving cobble-bar vegetation, a vegetation dynamics field survey and numerical simulation of flood flows have been conducted. The study focuses on sparse perennial community established on cobble bars of a river in Japan. The field survey conducted over ten years reveals the existence of special spots where small number of individuals survive large floods providing refugia for the species. Three-dimensional simulation further identified that the locations of refugia correspond to the low bed-shear force area created by the complex three-dimensional flow downstream of cobble bars that develop on the inner side of sharp bends. The sudden steep drop downstream of the bar that is needed for the low shear region appears to be maintained by the secondary flow associated with the sharp bend.



中文翻译:

大洪水期间鹅卵石植被的维持机理和避难所的地貌条件

为了了解保护鹅卵石植被的机理,已经进行了植被动力学现场调查和洪水流量的数值模拟。该研究的重点是在日本一条河流的鹅卵石上建立的稀疏多年生群落。十年来进行的实地调查表明,存在着一些特殊的地方,少数人幸存于大洪水中,为该物种提供了避难所。三维模拟进一步确定,避难所的位置对应于在急弯内侧发展的鹅卵石棒下游的复杂三维流所产生的低床层剪切力区域。低剪切区域所需的钢筋下游突然陡峭的下降似乎是由与急剧弯曲相关的二次流动所维持的。

更新日期:2020-03-06
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