Effects of hyporheic processes on streambed vertical hydraulic conductivity in three rivers of Nebraska

Song, Jinxi; Chen, Xunhong; Cheng, Cheng; Summerside, S. E.; Wen, Fujiang

doi:10.1029/2007gl029254

Cited by 57 publications

(91 citation statements)

References 27 publications

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“…This upward movement expands pore size and then enhances K of the top parts of streambeds (Song et al, 2007;Chen, 2011). Upward flow can pick up fine particles that otherwise are retained on the surface of coarse particles or clog between coarse grains.…”

Section: Introductionmentioning

confidence: 99%

“…Upwelling flow in streambeds on the other hand enlarges sediment pore size and enhances streambed hydraulic conductivity (Song et al, 2007). Laboratory experiments indicated that seepage direction at the water-sediment interface of a hyporheic setting affects the magnitude of sediment hydraulic conductivity (K) (Rosenberry and Pitlick, 2009a).…”

Section: Introductionmentioning

confidence: 99%

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Gaining and losing stream reaches have opposite hydraulic conductivity distribution patterns

Chen

Dong

et al. 2013

Hydrol. Earth Syst. Sci.

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Abstract. In gaining streams, groundwater seeps out into the streams. In losing streams, stream water moves into groundwater systems. The flow moving through the streambed sediments under these two types of hydrologic conditions is generally in opposite directions (upward vs. downward). The two opposite flow mechanisms affect the pore size and fine particle content of streambeds. Thus it is very likely that the opposite flow conditions affect the streambed hydraulic conductivity. However, comparisons of the hydraulic conductivity (K) of streambeds for losing and gaining streams are not well documented. In this study, we examined the K distribution patterns of sediments below the channel surface or stream banks for the Platte River and its tributaries in Nebraska, USA. Two contrasting vertical distribution patterns were observed from the test sites. In gaining reaches, hydraulic conductivity of the streambed decreased with the depth of the sediment cores. In losing reaches, hydraulic conductivity increased with the depth of the sediment cores. These contrasting patterns in the two types of streams were mostly attributed to flow directions during stream water and groundwater exchanges. In losing reaches, downward movement of water brought fine particle into the otherwise coarse sediment matrix, partially silting the pores. For gaining reaches, upward flow winnowed fine particles, increasing the pore spacing in the top parts of streambeds, leading to higher hydraulic conductivity in shallower parts of streambeds. These flux directions can impact K values to depths of greater than 5 m. At each study site, in situ permeameter tests were conducted to measure the K values of the shallow streambed layer. Statistical analyses indicated that K values from the sites of losing reaches were significantly different from the K values from the sites of gaining reaches.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gaining and losing stream reaches have opposite hydraulic conductivity distribution patterns

Chen

Dong

et al. 2013

Hydrol. Earth Syst. Sci.

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“…colmation, Brunke and Gonser 1997). The movement by groundwater invertebrates, especially larger ones such as amphipods, isopods and syncarids, also would help prevent clogging (Boulton 2000b;Song et al 2007), sustaining the interstitial environmental gradients responsible for biogeochemical filtration (Fig. 2).…”

Section: Stygofauna Biodiversity and Ecosystem Service Provision In Smentioning

confidence: 99%

Biodiversity, functional roles and ecosystem services of groundwater invertebrates

Boulton

Fenwick

Hancock

et al. 2008

Invert. Systematics

188

135

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Abstract. Recent surveys of groundwater invertebrates (stygofauna) worldwide are yielding rich troves of biodiversity, with significant implications for invertebrate systematists and phylogeneticists as well as ecologists and groundwater managers. What is the ecological significance of this high biodiversity of invertebrates in some aquifers? How might it influence groundwater ecosystem services such as water purification or bioremediation? In terrestrial ecosystems, biodiversity is typically positively correlated with rates of ecosystem functions beneficial to humans (e.g. crop pollination). However, the links between biodiversity, ecosystem function, and ecosystem services in groundwater are unknown. In some aquifers, feeding, movement and excretion by diverse assemblages of stygofauna potentially enhance groundwater ecosystem services such as water purification, bioremediation and water infiltration. Further, as specific taxa apparently play 'keystone' roles in facilitating ecosystem services, declines in abundance or even their extinction have serious repercussions. One way to assess the functional significance of biodiversity is to identify 'ecosystem service providers', characterise their functional relationships, determine how service provision is affected by community structure and environmental variables, and measure the spatio-temporal scales over which these operate. Examples from Australian and New Zealand alluvial aquifers reveal knowledge gaps in understanding the functional importance of most stygofauna, hampering effective protection of currently undervalued groundwater ecosystem services.

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“…At each test location, after the permeameter test, the way of collecting the sediment sample was by plugging the top of the pipe, such that a suction was formed as the pipe was removed from the riverbed, thus holding the sediment in place [18]. This procedure can prevent sediments from exiting at the bottom end of the pipe.…”

Section: Sediment Sampling and Grain Size Analysismentioning

confidence: 99%

“…The higher K v of the upper layer could be explained by the fact that hyporeic water exchange with inflow and outflow in the upper layer might result in more unconsolidated and permeable sediment, and invertebrate bioturbation (such as burrowing, feeding) in the upper layer of sediments could create new pore spaces and therefore a larger streambed K v . Moreover, gas bursts from redox processes can expand sediments and induce higher permeability [18].…”

Section: The Variation Of Streambed K V With Depthmentioning

confidence: 99%

Spatial and Temporal Variations of Streambed Vertical Hydraulic Conductivity in the Weihe River, China

Wang

Song

Zhang

et al. 2016

Water

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This study demonstrates the spatial and temporal variations of streambed vertical hydraulic conductivity K v from October 2011 to November 2014 along the Weihe River, the largest tributary of the Yellow River. The streambed K v values of a total number of 385 locations from five test sites were estimated on the basis of in situ falling-head standpipe permeameter tests. The difference of K v values for all test locations reaches five orders of magnitude with a range from 5.87E-04 to 61.3 m/d and a median value of 1.62E-01 m/d. The streambed K v values are neither normally nor log-normally distributed, but display significant spatial variability among the five test sites. The highest K v values occur at the site with mainly sandy sediment, while the K v values at the other four sites with mainly silt-clay sediment are relatively close and have less variability than those at the sandy sediment site. The median K v values from all of the sites exhibit no statistically significant temporal trends. However, the median K v values indeed show temporal variations that might be influenced by changes in silt-clay content of the sediment, especially for the sandy sediment site and the combined data from all sites. Weak evidence demonstrates that streambed K v values decrease with depth.

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Effects of hyporheic processes on streambed vertical hydraulic conductivity in three rivers of Nebraska

Cited by 57 publications

References 27 publications

Gaining and losing stream reaches have opposite hydraulic conductivity distribution patterns

Gaining and losing stream reaches have opposite hydraulic conductivity distribution patterns

Biodiversity, functional roles and ecosystem services of groundwater invertebrates

Spatial and Temporal Variations of Streambed Vertical Hydraulic Conductivity in the Weihe River, China

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