9.13 Geomorphic Controls on Hyporheic Exchange Across Scales: Watersheds to Particles

Wondzell, Steven M.

doi:10.1016/b978-0-12-374739-6.00238-4

Cited by 39 publications

(27 citation statements)

References 83 publications

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“…Additional details of differences in hyporheic exchange in various channel geometries can be found in Wondzell and Gooseff (2013). Based on these reports, it would therefore be expected that reduction in wood and channel incision resulting from riprap installation will alter hyporheic exchange in an unfavorable way, at least in the short term.…”

Section: Effects Of Riprap Placement On Habitat Qualitymentioning

confidence: 95%

Geomorphic and Ecological Consequences of Riprap Placement in River Systems

Reid

Church

2015

J American Water Resour Assoc

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Riprap, consisting of large boulders or concrete blocks, is extensively used to stabilize streambanks and to inhibit lateral erosion of rivers, yet its effect on river morphology and its ecological consequences have been relatively little studied. In this paper, we review the available information, most of it culled from the "grey" literature. We use a simple one-dimensional morphodynamic model as a conceptual tool to illustrate potential morphological effects of riprap placement in a gravel-bed river, which include inhibition of local sediment supply to the channel and consequent channel bed scour and substrate coarsening, and downstream erosion. Riprap placement also tends to sever organic material input from the riparian zone, with loss of shade, wood input, and input of finer organic material. Available information on the consequences for the aquatic ecosystem mainly concerns effects on commercially and recreationally important fishes. The preponderance of studies report unfavorable effects on local numbers, but habitat niches created by openings in riprap can favorably affect invertebrates and some small fishes. There is a need for much more research on both morphological and ecosystem effects of riprap placement.(KEY TERMS: rivers/streams; sediment transport; fluvial processes; riparian zone; aquatic habitat; rock armor; riprap.) Reid, David and Michael Church, 2015. Geomorphic and Ecological Consequences of Riprap Placement in River Systems.

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Section: Effects Of Riprap Placement On Habitat Qualitymentioning

confidence: 95%

Geomorphic and Ecological Consequences of Riprap Placement in River Systems

Reid

Church

2015

J American Water Resour Assoc

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“…From a hydrological perspective, the hyporheic zone is defined as the sediments, where stream water enters the subsurface and returns to the stream channel at the reach scale (Wondzell & Gooseff, ). From an ecological perspective, the hyporheic zone is a biogeochemical hot spot with high turnover rates of organic matter and inorganic nutrients, because most of microbial heterotrophic activity occurs in this compartment (Boulton, Findlay, Marmonier, Stanley, & Valett, ; Danczak et al., ; McClain et al., ).…”

Section: Introductionmentioning

confidence: 99%

Responses of microbial activity in hyporheic pore water to biogeochemical changes in a drying headwater stream

et al. 2019

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Microbial heterotrophic activity is a major driver of nutrient and organic matter processing in the hyporheic zone of headwater streams. Additionally, the hyporheic zone might provide refuge for microbes when surface flow ceases during drought events. We investigated chemical (organic and inorganic nutrients) and microbiological parameters (bacterial cell concentration, live–dead ratios, and extracellular enzyme activities) of surface and interstitial pore water in a period of progressive surface‐hyporheic disconnection due to summer drying. The special situation of the chosen study reach, where groundwater mixing is impeded by the bedrock forming a natural channel filled with sediment, allowed as to study the transformation of these parameters along hyporheic flow paths. The chemical composition of the hyporheic pore water reflected the connectivity with the surface water, as expressed in the availability of nitrate and oxygen. Conversely, microbiological parameters in all hyporheic locations were different from the surface waters, suggesting that the microbial activity in the water changes rapidly once the water enters the hyporheic zone. This feature was principally manifested in higher live–dead ratios and lower leucine aminopeptidase (an activity related to nitrogen acquisition) in the hyporheic pore waters. Overall, bacterial cell concentration and extracellular enzyme activities increased along hyporheic flow paths, with a congruent decrease in inorganic nutrients and dissolved organic matter quantity and apparent molecular size. Our findings show two important functions of the hyporheic zone during drought: (1) deeper (−50 cm) water‐saturated layers can act as a refuge for microbial activity; and (2) the hyporheic zone shows high rates of carbon and nitrogen turnover when water residence times are longer during drought. These rates might be even enhanced by an increase in living microbes in the remaining moist locations of the hyporheic zone.

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“…In the 25 next sections we discuss how temporal and spatial variations in groundwater and river levels influence the extent of the HZ and HEF. Within the context of groundwater dynamics, we accept that HEF takes place in both losing and gaining stream conditions (Harvey and Bencala, 1993;Harvey et al, 2003;Stonedahl et al, 2012;Fox et al, 2014) although the way it occurs is a function of regional groundwater and catchment characteristics interacting with smaller-scale reach properties (Larkin and Sharp, 1992;Wondzell and Gooseff, 2013).…”

mentioning

confidence: 99%

“…vegetation) (Section 4.5.1) (Poole et al, 2006;Wondzell, 2006; 5 Jones et al, 2008;Ward et al, 2012;Wondzell and Gooseff, 2013;.…”

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confidence: 99%

Scaling down hyporheic exchange flows: from catchments to reaches

Magliozzi

Grabowski

Packman

et al. 2017

Preprint

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Abstract. Rivers are not isolated systems but continuously interact with the subsurface from upstream to downstream. In the last few decades, research on the hyporheic zone (HZ) from many perspectives has increased appreciation of the hydrological importance and ecological significance of connected river and groundwater systems. Although recent reviews, 10 modelling and field studies have explored hydrological, biogeochemical and ecohydrological processes in the HZ at relatively small scales (bedforms to reaches), a comprehensive understanding of the factors driving the hyporheic exchange flows (HEF) at larger scales is still missing. To date, there is fragmentary information on how hydroclimatic, hydrogeologic, topographic, anthropogenic and ecological factors interact to drive hyporheic exchange flows at large scales. Further evidence is needed to link hyporheic exchange flows across scales. This review aims to conceptualize interacting factors at catchment, 15 valley and reach scales that control spatial and temporal variations in hyporheic exchange flows. The implications of these drivers are discussed for each scale, and co-occurrences across scale are highlighted in a case of study. By using a multi-scale perspective, this review connects field observations and modelling studies to identify broad and general patterns of HEF in different catchments. This multi-scale perspective is useful to devise approaches to interpret hyporheic exchange across multiscale heterogeneities, to infer scaling relationships, and to inform watershed management decisions. 20

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9.13 Geomorphic Controls on Hyporheic Exchange Across Scales: Watersheds to Particles

Cited by 39 publications

References 83 publications

Geomorphic and Ecological Consequences of Riprap Placement in River Systems

Geomorphic and Ecological Consequences of Riprap Placement in River Systems

Responses of microbial activity in hyporheic pore water to biogeochemical changes in a drying headwater stream

Scaling down hyporheic exchange flows: from catchments to reaches

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