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首页> 外文学位 >A post-project assessment of the Provo River Restoration Project: Channel design, reconfiguration, and the re-establishment of critical physical processes.
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A post-project assessment of the Provo River Restoration Project: Channel design, reconfiguration, and the re-establishment of critical physical processes.

机译：普罗沃河修复项目的项目后评估：通道设计，重新配置和关键物理过程的重新建立。

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A physical assessment of the Provo River Restoration Project was undertaken in order to determine how alterations to the channel were designed, the nature of as-built channel morphology, and the performance of the reconfigured channel in terms of achieving frequent (2-year recurrence) bankfull discharge and increasing transient storage. Measures of channelized and reconfigured channel morphology were obtained using total station survey, digital aerial photography, and pebble counts. Results of geomorphic analysis were compared with similar measurements made by a regional consulting company, and stream channel design data, in order to determine that intended mitigation included reducing channel capacity, increasing sinuosity, decreasing pool spacing, and decreasing the size of bed material. Reconfiguration of the channel resulted in somewhat enlarged cross-sections with reduced mean velocities, increased sinuosity, decreased pool spacing, and decreased bed substrate size.;One-dimensional hydraulic modeling suggests that alterations to channel morphology have increased the bankfull channel capacity in most reaches. Modeling results illustrate the fact that the stage of the 2-year recurrence flood is below bankfull at most cross-sections. This result does not follow the intentions of channel design. However, we have observed floodplain inundation in most years since reconfiguration. The occurrence floodplain inundation is being facilitated by overbank flow at a few point locations illustrating the strengths of incorporating variability into design.;Known geomorphic controls on transient storage were reconfigured in manner to potentially increase in-channel and hyporheic components of transient storage. Stream tracer tests were utilized in order to determine the degree to which these alterations affected transient storage. Numerical analysis of stream tracer tests suggests that while the relative area of transient storage increased, average residence time of water in storage, and the mass transfer rate of solute between storage and the stream did not change. This suggests that an extensive hyporheic zone may not have been established. Correlations between hydrologic and geomorphic parameters indicate that in-stream storage may have been increased, and quick-exchange hyporheic flowpaths may have been created.
机译：对Provo河修复工程进行了物理评估，以确定如何设计河道改建，建成河道形态的性质以及重新配置河道的性能（以实现频繁（两年为期））完全放电并增加瞬态存储。使用全站仪调查，数字航空摄影和小卵石计数来获得通道化和重新配置的通道形态的度量。将地貌分析的结果与区域咨询公司进行的类似测量以及流道设计数据进行了比较，以确定确定的缓解措施包括减少河道容量，增加波度，减小池间距和减小床层材料的尺寸。通道的重新配置导致横截面有所扩大，平均速度降低，弯曲度增加，池间距减小，床底物尺寸减小。；一维水力模型表明，通道形态的改变增加了大部分河段的河岸通道容量。建模结果说明了这样一个事实，即在大多数横截面中，两年复发洪水的阶段都低于堤岸。此结果不符合通道设计的意图。但是，自重新配置以来，多数年来我们已经观察到洪泛区被淹没。通过在几个点上的过度流动促进了洪泛区的淹没，说明了将可变性纳入设计的优势。临时存储的已知地貌控制被重新配置，以潜在地增加瞬态存储的通道内和流变成分。为了确定这些变化影响瞬态存储的程度，使用了流示踪剂测试。流示踪剂试验的数值分析表明，尽管瞬时存储的相对面积增加了，但水在存储中的平均停留时间以及溶质在存储和流之间的传质速率没有变化。这表明可能尚未建立广泛的水流带。水文参数与地貌参数之间的相关性表明，流内存储量可能已经增加，并且可能已经建立了快速交换的流变流路。

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