23 Reservoir operations, physical processes, and ecosystem losses

Jorde, Klaus; Burke, Michael J.; Scheidt, Nicholas; Welcker, C. W.; King, S. L.; Borden, Carter

doi:10.1016/s0928-2025(07)11151-2

Cited by 6 publications

(6 citation statements)

References 59 publications

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“…The purpose of this contribution is to present the multicriteria diagnosis carried out on the Ain River in France-a dammed water stream-prior to a restoration project. To integrate the impact of dams on sediment dynamics and on different ecological components, we have used a process-based hierarchy that is particularly suited to assessing the processes linking successive levels of dam impacts (Petts 1984;Jorde et al, 2008;Burke et al, 2009). First, we have highlighted the sediment deficit and the location of already affected reaches.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Consequences of Sediment Deficit on a Gravel River Bed Downstream of Dams in Restoration Perspectives: Application of a Multicriteria, Hierarchical and Spatially Explicit Diagnosis

et al. 2013

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As regards river restoration, it is fundamental to better link human pressures and environmental responses and to take into consideration not only target species or habitat but diverse ecological elements. This permits to assess sustainable restoration plan, especially concerning sediment augmentation below dams. The use of a hierarchical multicriteria approach on the Ain River permits us to assess a diagnosis of sediment deficit impact integrating several morphological (channel shifting, river bed degradation and river bed coarsening) and ecological components (Riparian and floodplain lake and fish communities). Our diagnosis also integrates a temporal and spatial approach better to link human pressures and environmental responses and to identify the dam effects amongst other drivers (e.g. grazing decline and channel regulation). The results confirm causality links between sediment deficit and slight channel bed degradation (0.01 m.year−1) or channel bed paving and thus highlight the impact of the dam on the drying of the riparian forest and on former channel community. However, the relationship between incision and reduction in active channel lateral mobility is more difficult to establish. The role of sediment deficit in the current variability of the riparian regeneration capacity and, thereby, landscape diversity along the lower valley remains unclear. This study also confirms the relevance of using different ecological indicators, notably because all components present different adjustment time scales, whereas some of them are more sensitive to other impacts. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Assessment of Consequences of Sediment Deficit on a Gravel River Bed Downstream of Dams in Restoration Perspectives: Application of a Multicriteria, Hierarchical and Spatially Explicit Diagnosis

et al. 2013

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“…Hydropeaking dam operation and water extractions for irrigation have been broadly stated as alterations to natural flow regimes (Ward and Stanford, 1983; Petts, 1984; Poof and Allan, 1997; Magilligan and Nislow, 2005; Jorde et al ., 2008), i.e. changes in flow magnitude, frequency, duration, timing and rate of change (Junk et al ., 1989).…”

Section: Introductionmentioning

confidence: 99%

Downstream environmental effects of dam operations: Changes in habitat quality for native fish species

García

Jorde²,

Habit

et al. 2011

River Research & Apps

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Hydropeaking dam operation and water extractions for irrigation have been broadly stated as alterations to natural flow regimes, which have also been noticed in the Biobío Watershed, in Central Chile, since 1996. In the Biobío River, most of native fish species are endemic and very little is known about them. Their ecological and social values have never been estimated, and there is lack of information about their habitat preferences. Furthermore, changes on fish habitat availability due to natural and/or man-made causes have not been evaluated. In this study, eight native fish species, in a representative reach of the Biobío River, were studied and their preferred habitats were surveyed and characterized. A hydrodynamic model was built and linked to the fish habitat simulation model CASiMiR. Fuzzy rules and fuzzy sets were developed for describing habitat preference of the native fish species. CASiMiR was then used to simulate how physical habitat conditions vary due to flow control (i.e. upstream dams). Results show how overall habitat quality, expressed as weighted usable area (WUA) and hydraulic habitat suitability (HHS), changes and fluctuates due to the dam operation and how the daily hydropeaking is influencing quantity, quality and location of different habitats. The study suggests that the analysed fish are highly susceptible to flow control, as dams are currently operated, and fish habitat improvement suggestions are proposed.

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“…Flow regulation may also have elevated river metabolism and altered the timing of elevated-period GPP through other mechanisms, such as differences in bed mobility and scouring. Regulated flow from dam operations reduces hydrologic variability, including the magnitude and frequency of extreme flow events (Jorde et al 2007, Aristi et al 2014. Flow regulation contributes to elevated GPP and ER downstream of reservoirs (Aristi et al 2014) by reducing bed mobility and enhancing algal proliferation (Morley et al 2008) or enhancing accumulation of dissolved organic carbon, suspended particulate organic matter, and benthic organic matter including plankton from the reservoir (Aristi et al 2014).…”

Section: Unregulated Flow Vs Regulated Flowmentioning

confidence: 99%

“…Our understanding of river metabolism is improving (Dodds et al 2013, Bernhardt et al 2018, and many factors that affect river metabolism are influenced by river management. For example, reservoir operations alter relative rates of GPP and ER (Demars et al 2011, Davis et al 2012, Dodds et al 2013, Hall et al 2015, Bernhardt et al 2018) by altering flow (Vörösmarty and Sahagian 2000) and temperature (Olden and Naiman 2010) regimes, impeding the flow of organic carbon, nutrients, and sediment (Jorde et al 2007), and removing algal biomass (Poff et al 1997). However, our knowledge is limited about how river management affects river metabolism (Slavik et al 2004, Levi et al 2013, Kupilas et al 2017).…”

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confidence: 99%

River management alters ecosystem metabolism in a large oligotrophic river

et al. 2020

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Algae and aquatic plants support river food webs through in-situ primary production. However, gross primary production (GPP) and ecosystem respiration (ER) are rarely evaluated in the context of river management or habitat restoration. We estimated daily GPP and ER during 2 growing seasons for 7 reaches in the Kootenai River and 1 reach in the Elk River, spanning 290 river km across British Columbia, Canada, and Montana and Idaho, USA. We characterized responses of GPP and ER to river management, including reaches with unregulated flow, regulated flow, nutrient addition, and habitat restoration. Downstream GPP and ER generally increased after changes in river management, and higher management intensity led to greater increases. GPP and ER followed a seasonal pattern with low initial values in spring, elevated values in mid-summer, and a return to low values in late summer and autumn. Timing and duration of the elevated period for GPP and ER also differed among reaches following changes in river management. Our results suggest that river management affects GPP and ER, likely through reducing turbidity and the frequency and magnitude of extreme flow events, nutrient additions, and enhanced floodplain connectivity, thereby altering the timing and amount of autochthonous carbon available to the food web.

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23 Reservoir operations, physical processes, and ecosystem losses

Cited by 6 publications

References 59 publications

Assessment of Consequences of Sediment Deficit on a Gravel River Bed Downstream of Dams in Restoration Perspectives: Application of a Multicriteria, Hierarchical and Spatially Explicit Diagnosis

Assessment of Consequences of Sediment Deficit on a Gravel River Bed Downstream of Dams in Restoration Perspectives: Application of a Multicriteria, Hierarchical and Spatially Explicit Diagnosis

Downstream environmental effects of dam operations: Changes in habitat quality for native fish species

River management alters ecosystem metabolism in a large oligotrophic river

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