Controlled sediment flushing at the Cancano Reservoir (Italian Alps): Management of the operation and downstream environmental impact

Espa, Paolo; Brignoli, Maria Laura; Crosa, Giuseppe; Gentili, Gaetano; Quadroni, Silvia

doi:10.1016/j.jenvman.2016.07.021

Cited by 47 publications

(41 citation statements)

References 31 publications

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“…Marcé, Moreno‐Ostos, García‐Barcina, and Armengol () used numerical simulations to maximize the water quality of a planned dam by controlling the hypolimnetic oxygen dynamics. Besides water temperature and DO, selective withdrawal can also be used to remove undesirable water layers (high algal biomass and turbidity) by flushing (Espa, Brignoli, Crosa, Gentili, & Quadroni, ; Moreno‐Ostos et al, ). Complex optimization techniques have been applied to combine different demands for downstream river and reservoir water quality (Castelletti, Yajima, Giuliani, Soncini‐Sessa, & Weber, ; Kerachian & Karamouz, ; Labadie, ).…”

Section: Discussionmentioning

confidence: 99%

Minimizing environmental impact whilst securing drinking water quantity and quality demands from a reservoir

Weber

Boehrer

Rinke

2019

River Research & Apps

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Complying with the demands of drinking water supply whilst minimizing environmental impact poses a great challenge in water management. This study investigates the potential of withdrawal management of drinking water reservoirs to alleviate the disruption of the river continuum by a reservoir dam with respect to temperature and discharge. The aim is the identification of an optimal withdrawal strategy to provide a near-natural discharge temperature and flow for the downstream river without jeopardizing drinking water production. First, we identify the applicability of new withdrawal regimes for raw water security and downstream river demands. Second, we search for an ideal withdrawal regime in scenario simulations using a numerical reservoir model ("General Lake Model"). The scenarios on a drinking water reservoir in Germany demonstrate that we are able to derive an optimized reservoir management. The numerical model is provided for operators as a simple and efficient tool for optimizing the withdrawal strategy within reservoir management.

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Section: Discussionmentioning

confidence: 99%

Minimizing environmental impact whilst securing drinking water quantity and quality demands from a reservoir

Weber

Boehrer

Rinke

2019

River Research & Apps

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“…The primary environmental impact of sediment management is associated with elevated turbidity, though it was identified as a concern only at two of the sites, and the literature on this impact is still immature. For instance, large pulse releases of sediment during flushing operations can impact downstream aquatic organisms through abrasion, burial, and in cases of organic sediments, anoxia [58,59]. Besides, dredging is known to impact aquatic organisms in the reservoirs in a variety of adverse ways [60,61] that range from direct mortality over the short term to transgenerational effects over the long term.…”

Section: Barriers To Sustainable Reservoirsmentioning

confidence: 99%

Sediment Management in Taiwan’s Reservoirs and Barriers to Implementation

Wang

Kondolf

Tullos

et al. 2018

Water

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Abstract:Reservoirs play a critically important role in supplying water for human uses. However, sedimentation limits storage capabilities and increases risk for aging infrastructure. The objectives of this paper are to synthesize both general sediment management strategies and past sediment management efforts in Taiwan in order to identify the barriers to more effective sediment management in reservoirs globally. A review of the broader literature and six Taiwan case studies was conducted to examine the characteristics, limitations, costs, and effectiveness of different sediment management strategies. Results highlight how social barriers play an important role in limiting reservoir sustainability, particularly the crisis-response approach to addressing sedimentation and the low priority for sediment management relative to competing objectives, such as tourism. Technical barriers are driven primarily by the engineering and costs of retrofitting existing dams and site conditions that may inhibit particular practices at any given site. Results also highlight tradeoffs in the effectiveness, costs, and time efficiency of various sediment management strategies in restoring storage capacity. The high sediment loads and rapid filling of reservoirs in Taiwan provide early insight into the management issues that are emerging worldwide, and these results emphasize the need for proactive engineering and management of sediment in reservoirs globally.

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“…The impact of suspended sediments on biota is essentially a function of time and concentration (Newcombe & Jensen, ). In this context, some studies have described the impact caused by a long period of increased SSC downstream of a reservoir (Brandt & Swenning, ; Crosa, Castelli, Gentili, & Espa, ; Espa, Brignoli, Crosa, Gentili, & Quadroni, ; Reckendorfer, Badura, & Schütz, ; Shen, ). It is known that increases in SSC can trigger changes in invertebrate drift (Bejar, Gibbins, Vericat, & Batalla, ).…”

Section: Introductionmentioning

confidence: 99%

Spatio‐temporal variability of suspended sediments in rivers and ecological implications of reservoir flushing operations

Tritthart

Haimann

Habersack

et al. 2019

River Research & Apps

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High suspended sediment concentrations during reservoir flushing are known to be harmful to biota in downstream river stretches. Therefore, it is common practice to set legal concentration limits for upstream reservoir management operations such as flushings or controlled drawdowns. However, as shown by measurements, there is a considerable spatio-temporal variability of suspended sediment concentrations both in the longitudinal profile of rivers and in river cross-sections. To consider this variability in management operations, SED-FISH-a three-dimensional modelling approach-was developed to study this variability in a wider context by upscaling cross-sectional measurements of suspended sediments to high-resolution threedimensional information on the reach scale in an alpine river. The resulting patterns of suspended sediment concentrations were integrated over their respective time of occurrence for various scenarios in order to calculate severity of harmful impacts for target fish species. The modelling results identified refugial habitats with reduced negative impacts in near-bank zones even for relatively high suspended sediment concentrations in the centre of the river. Moreover, a substantially larger variability of both suspended sediment concentrations and associated harmful impacts was found for a winding riverbed morphology as compared with a straight reach. Both these findings and the developed modelling tool could assist in establishing individual case-based concentration limits for reservoir management operations in the future and should also be taken into account when planning river regulation or restoration measures.

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Controlled sediment flushing at the Cancano Reservoir (Italian Alps): Management of the operation and downstream environmental impact

Cited by 47 publications

References 31 publications

Minimizing environmental impact whilst securing drinking water quantity and quality demands from a reservoir

Minimizing environmental impact whilst securing drinking water quantity and quality demands from a reservoir

Sediment Management in Taiwan’s Reservoirs and Barriers to Implementation

Spatio‐temporal variability of suspended sediments in rivers and ecological implications of reservoir flushing operations

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