Chinook Salmon habitat evolution following river restoration, drought, and flood

Brown, Rocko A.; Sellheim, Kirsten; Anderson, Jesse T.; Merz, Joseph E.

doi:10.1080/24705357.2022.2162987

Cited by 2 publications

(4 citation statements)

References 118 publications

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“…Rivers throughout the UK have centuries‐long histories of management and engineering for land drainage and flood control. As a result, their planforms are commonly single‐threaded, their cross‐sections are usually overly large and simplified, and their channels are disconnected from their floodplains (Brown et al, 2022; Gurnell & Downs, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…As the fabric, packing and protrusion of gravel bed grains are known to influence their entrainment, the long periods where bio‐power exceeds stream power may result in significant changes to threshold values for bed material entrainment and motion. Such effects have been documented in the field for fish; for example, Pledger, Rice, & Millet (2017) found cyprinid fish reworked gravel substrates at low flows through their feeding activity, and Brown et al (2022) found spawning Chinook salmon ( Oncorhynchus tshawytscha ) reworked recently restored gravels, which could cause topographic changes to substrates that exceed those associated with the flow under drought if populations meet their post‐restoration target.…”

Section: Discussionmentioning

confidence: 99%

“…Rivers throughout the UK have centuries-long histories of management and engineering for land drainage and flood control. As a result, their planforms are commonly single-threaded, their cross-sections are usually overly large and simplified, and their channels are disconnected from their floodplains (Brown et al, 2022;Gurnell & Downs, 2021). When an anthropogenic, incised, single-thread channel replaces the multi-thread, anastomosed river-wetland corridor that predated it, this concentrates flow and increases specific stream power at all inbank discharges, but especially during intermediate and high flows that would naturally spread across floodplain (Brown et al, 2018;Cluer & Thorne, 2014;Walsh et al, 2005).…”

Section: The Power Of Biology In Anthropogenic Streamsmentioning

confidence: 99%

“…During these periods, the activities of animals could be cumulatively significant either by moving bed sediment directly or altering bed surface grain size distributions and structures in ways that may increase or decrease threshold shear stresses required for entrainment during subsequent, high flows (e.g. Brown et al, 2022; Rice et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Accounting for the power of nature: Using flume and field studies to compare the capacities of bio‐energy and fluvial energy to move surficial gravels

Johnson,

Albertson,

Everall

et al. 2024

Earth Surf Processes Landf

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River channels, riparian and floodplain forms and dynamics are all influenced strongly by biological processes. However, the influence of macroinvertebrates on entrainment and transport of river sediments remains poorly understood. We use an energy‐based approach to explore the capacity of benthic animals to move surficial, gravel‐bed particles in field and laboratory settings and use the results to assess the relative significance of biological and physical benthic processes. Our results showed that in 11 British gravel‐bed rivers, the maximum energy content (i.e., calorific content) of macroinvertebrate communities generally matched the flow energy associated with median discharges and, at multiple sites, exceeded that of the 10‐year return interval flood. A series of laboratory experiments used to estimate the minimum energy expended by signal crayfish (Pacifastacus leniusculus) when performing geomorphic work established that crayfish move gravel particles at energy levels below that expected of the flow, complicating direct comparisons of the capacity for macroinvertebrates and fluvial flows to influence bed mobility. Our findings suggest that the influence of macroinvertebrate communities in either promoting or suppressing, the mobilisation of the bed may be large compared to equivalent values of fluvial energy. Based on these findings, we conclude that in the gravel‐bed rivers studied, the macroinvertebrate community's potential to perform geomorphic work matches or exceeds the stream power during most of the year. Although our study examined biological and fluvial energy systems separately, it is important to recognise that in nature, these systems are highly interactive. It follows that utilising the energy framework presented in this paper could lead to rapid advances in both fluvial biogeomorphology and river management and restoration.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%