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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Morphologic adjustments of actively evolving highly curved neck cutoffs
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Morphologic adjustments of actively evolving highly curved neck cutoffs

机译：积极发展高度弯曲颈部截止的形态学调整

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摘要

Neck cutoffs and their resultant oxbow lakes are important and prominent features of riverine landscapes. Detailed field-based research focusing on the morphologic evolution of neck cutoffs is currently insufficient to fully characterize cutoff evolution. High-resolution bathymetric data were collected over 3 years for the purpose of determining channel morphology and morphologic change on three actively evolving neck cutoffs. Results indicate the following general trends in morphologic adjustment: (1) a longitudinal bar in the upstream meander limb that develops near the entrance to the abandoned bend; (2) a deep scour hole in the downstream meander limb immediately downstream of the cutoff channel; (3) erosion of the bank opposite the cutoff in the downstream meander limb; (4) a cutoff bar in the downstream meander limb at the junction corner of the cutoff channel and the downstream meander limb; and (5) perching of the exit of the abandoned bend above the cutoff channel due to channel bed incision. The results presented herein were used to develop a conceptual model that depicts the morphologic evolution of highly curving neck cutoffs. The findings of this research are combined with recent analyses of the three-dimensional flow structure through neck cutoffs to provide a mechanistic explanation for the morphodynamics of neck cutoffs. (c) 2019 John Wiley & Sons, Ltd.
机译：颈部截止和它们所产生的牛湖是河流景观的重要和突出特征。专注于颈部截止的形态学演变的基于领域的研究目前不足以完全表征截止进化。在3年内收集高分辨率碱基数据，以确定信道形态和形态变化的三个主动演化的颈部截止。结果表明以下形态调整的一般趋势：（1）上游曲折肢体中的纵向杆，在入口处开发到废弃的弯道附近; （2）下游蜿蜒肢体的深冲孔孔，紧邻截止频道下游; （3）银行侵蚀下游曲折肢体的截止物; （4）截止通道接线角下下游蜿蜒肢体中的截止条和下游曲折肢体; （5）由于通道床切口，截止截止通道上方的废弃弯曲的出口。本文呈现的结果用于开发一种概念模型，其描绘了高弯曲颈部截止的形态学演变。该研究的结果与近期通过颈部截止的三维流动结构分析相结合，为颈部截止的形态学性能提供机械解释。 （c）2019 John Wiley＆Sons，Ltd。

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