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Hydraulic analysis of stream restoration on flood wave propagation.

机译:水流恢复对洪水波传播的水力分析。

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摘要

Channel and floodplain restoration can enhance the ability of a channelized or incised reach to temporarily store the flow and dissipate the energy of passing flood waves. Elements of restoration design that can enhance flood wave attenuation include the introduction of meanders, which reduces channel slope and increases channel length, restoring channel-floodplain connectivity, and re-vegetating banks and the floodplain. I examined the efficacy of stream restoration to attenuate floods given the scale at which it occurs and the magnitude of channel change possible by quantifying flood wave attenuation on two restored reaches located in urban and rural catchments and on hypothetical stream reaches representing median values of stream restoration projects in North Carolina using a dynamic flood routing model (UNET in HEC-RAS). Floods routed in impaired and restored reach models of field sites either exhibited very small augmentation to attenuation, largely due to assumed increases in floodplain roughness, or a decrease in attenuation. Modeled sensitivity results indicated that decreases to slope and increases to channel and floodplain roughness demonstrated the highest relative impact to attenuation. Floods of intermediate magnitude (between 2 and 5 yr recurrence interval) were impacted most by restoration, especially those confined to the channel under the impaired morphology but able to access the floodplain under the restored morphology.
机译:河道和洪泛区的修复可以增强沟渠或切开河段的能力,以临时存储流量并消散通过洪水的能量。可以增强洪水波衰减能力的恢复设计要素包括引入曲折河道,这可以减小河道坡度并增加河道长度,恢复河道与洪泛区的连通性,以及重新植被和恢复洪泛区。我根据给定洪水发生的规模和通过改变位于城市和农村集水区的两个恢复河段以及假设的河段代表洪水恢复中值的洪水波衰减来量化洪水波衰减的可能性,研究了河流恢复对衰减洪水的功效。使用动态洪水泛洪路由模型(HEC-RAS中的UNET)在北卡罗来纳州进行项目。在假定的洪泛区粗糙度增加或衰减降低的情况下,在受损和恢复的野外河段模型中传播的洪水对衰减的增加非常小。建模的灵敏度结果表明,坡度减小,河道和洪泛区粗糙度增加表明对衰减的最大相对影响。恢复对中级洪水(复发间隔在2至5年之间)的影响最大,特别是那些形态受损的局限在河道内但能够恢复恢复形态的洪泛区的洪水。

著录项

  • 作者

    Sholtes, Joel.;

  • 作者单位

    The University of North Carolina at Chapel Hill.;

  • 授予单位 The University of North Carolina at Chapel Hill.;
  • 学科 Physical Geography.;Hydrology.;Engineering Environmental.
  • 学位 M.A.
  • 年度 2009
  • 页码 94 p.
  • 总页数 94
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然地理学;环境污染及其防治;水文科学(水界物理学);
  • 关键词

  • 入库时间 2022-08-17 11:37:40

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