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A Comparison of Hyporheic Transport at a Cross-Vane Structure and Natural Riffle

机译：跨叶片结构和天然Riffle的疏水运输的比较

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摘要

While restoring hyporheic flowpaths has been cited as a benefit to stream restoration structures, little documentation exists confirming that constructed restoration structures induce comparable hyporheic exchange to natural stream features. This study compares a stream restoration structure (cross-vane) to a natural feature (riffle) concurrently in the same stream reach using time-lapsed electrical resistivity (ER) tomography. Using this hydrogeophysical approach, we were able to quantify hyporheic extent and transport beneath the cross-vane structure and the riffle. We interpret from the geophysical data that the cross-vane and the natural riffle induced spatially and temporally unique hyporheic extent and transport, and the cross-vane created both spatially larger and temporally longer hyporheic flowpaths than the natural riffle. Tracer from the 4.67-h injection was detected along flowpaths for 4.6 h at the cross-vane and 4.2 h at the riffle. The spatial extent of the hyporheic zone at the cross-vane was 12% larger than that at the riffle. We compare ER results of this study to vertical fluxes calculated from temperature profiles and conclude significant differences in the interpretation of hyporheic transport from these different field techniques. Results of this study demonstrate a high degree of heterogeneity in transport metrics at both the cross-vane and the riffle and differences between the hyporheic flowpath networks at the two different features. Our results suggest that restoration structures may be capable of creating sufficient exchange flux and timescales of transport to achieve the same ecological functions as natural features, but engineering of the physical and biogeochemical environment may be necessary to realize these benefits.
机译：虽然恢复性流道被认为是对河流恢复结构的一种好处，但很少有文献证实构造的恢复结构可引起与自然流特征相当的流体交换。这项研究使用时延电阻率（ER）层析成像技术，将同一河流段中的河流流恢复结构（跨叶片）与自然特征（浅滩）同时进行比较。使用这种水文地球物理方法，我们能够量化流变程度和跨叶片结构和浅滩的运输。我们从地球物理数据中解释，横叶片和天然浅滩在空间和时间上引起了独特的流变程度和运移，而横叶片比天然浅滩在空间上和时间上都产生了较大的流变路径。在跨叶片的4.6 h处和在浅滩的4.2 h处沿流动路径检测到4.67 h注入的示踪剂。横叶片上的流变区的空间范围比浅滩上的流变区大12％。我们将本研究的ER结果与根据温度曲线计算的垂直通量进行比较，并得出这些不同领域技术对流变传输的解释的显着差异。这项研究的结果表明，跨叶片和浅滩的输运指标高度异质，两个不同特征的流变流路网络之间也存在差异。我们的结果表明，修复结构可能能够产生足够的交换通量和运输时标，以实现与自然特征相同的生态功能，但是物理和生物地球化学环境的工程化可能对于实现这些益处是必要的。

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    《Ground water》 |2015年第6期|859-871|共13页
  • 作者

    Smidt Samuel J.; Cullin Joseph A.; Ward Adam S.; Robinson Jesse; Zimmer Margaret A.; Lautz Laura K.; Endreny Theodore A.;

  • 作者单位

    Univ Iowa, Dept Earth & Environm Sci, Iowa City, IA 52242 USA;

    Univ Iowa, Dept Earth & Environm Sci, Iowa City, IA 52242 USA;

    Indiana Univ, Sch Publ & Environm Affairs, Bloomington, IN 47405 USA;

    Univ Louisville, Dept Civil & Environm Engn, Stream Inst, Louisville, KY 40206 USA;

    Duke Univ, Nicholas Sch Environm, Div Earth & Ocean Sci, Durham, NC 27708 USA;

    Syracuse Univ, Dept Earth Sci, Syracuse, NY 13244 USA;

    SUNY Coll Environm Sci & Forestry, Dept Environm Resources Engn, Syracuse, NY 13210 USA;

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