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首页> 外文期刊>Journal of the American Water Resources Association >MODELING THE LONG TERM IMPACTS OF USING RIGID STRUCTURES IN STREAM CHANNEL RESTORATION
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MODELING THE LONG TERM IMPACTS OF USING RIGID STRUCTURES IN STREAM CHANNEL RESTORATION

机译：在通道重建中使用刚性结构对长期影响进行建模

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摘要

Natural channel designs often incorporate rigid instream structures to protect channel banks, provide grade control, promote flow deflection, or otherwise improve channel stability. The long term impact of rigid structures on natural stream processes is relatively unknown. The objective of this study was to use long term alluvial channel modeling to evaluate the effect of rigid structures on channel processes and assess current and future stream channel stability. The study was conducted on Oliver Run, a small stream in Pennsylvania relocated due to highway construction. Field data were collected for one year along the 107 m reach to characterize the stream and provide model input, calibration, and verification data. FLUVIAL-12 was used to evaluate the long term impacts of rigid structures on natural channel adjustment, overall channel stability, and changing form and processes. Based on a consideration of model limitations and results, it was concluded that the presence of rigid structures reduced channel width-to-depth ratios, minimized bed elevation changes due to long term aggradation and degradation, limited lateral channel migration, and increased the mean bed material particle size throughout the reach. Results also showed how alluvial channel modeling can be used to improve the stream restoration design effort.
机译：天然通道的设计通常会合并刚性的河道结构，以保护通道堤，提供坡度控制，促进流量偏转或提高通道稳定性。刚性结构对自然流过程的长期影响相对未知。这项研究的目的是使用长期冲积河道模型来评估刚性结构对河道过程的影响，并评估当前和未来的河道河道稳定性。这项研究是在奥利弗·勒恩（Oliver Run）上进行的。沿107 m的河道收集了一年的现场数据，以表征流并提供模型输入，校准和验证数据。 FLUVIAL-12用于评估刚性结构对自然通道调整，总体通道稳定性以及形状和工艺变化的长期影响。基于对模型局限性和结果的考虑，得出的结论是，刚性结构的存在降低了河道的宽深比，由于长期的凝结和退化导致河床仰角变化最小，有限的侧向河床迁移并增加了平均河床整个范围内的材料粒径。结果还显示了冲积河道建模如何可用于改善河流修复设计工作。

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