Morpho-sedimentary dynamics associated to dam removal. The Pierre Glissotte dam (central France)

Gilet, Louis; Gob, Frédéric; Virmoux, Clément; Gautier, Emmanuèle; Thommeret, Nathalie; Jacob-Rousseau, Nicolas

doi:10.1016/j.scitotenv.2021.147079

Cited by 9 publications

(7 citation statements)

References 55 publications

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“…Ralston et al, 2021). The Carmel River evolved similarly to the example of the Pierre Glissotte Dam (7.3 m high) removed from the Yvonne River in France, where despite ‘intense morpho‐sedimentary dynamics in the reservoir and effective restoration of bedload continuity’, fluvial morphology below the former dam site remained largely unchanged (Gilet et al, 2021). In two other examples of similar response style, Amethyst Brook, Massachusetts remained sediment supply‐limited during its 1–2‐year geomorphic adjustment to removal of a 6 m dam (Magilligan et al, 2021), and geomorphic changes on the Penobscot River, Maine, in response to removal of two dams (6 and 10 m high), were small enough to be within measurement uncertainty (Collins et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Six years of fluvial response to a large dam removal on the Carmel River, California, USA

East

Harrison

Smith

et al. 2023

Earth Surf Processes Landf

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Measuring river response to dam removal affords a rare, important opportunity to study fluvial response to sediment pulses on a large field scale. We present a before-after/control-impact study of the Carmel River, California, measuring fluvial geomorphic and grain-size evolution over 8 years, six of which postdated removal of a 32 m-high dam (one of the largest dams removed worldwide) and included 11 flow events exceeding the 2-year flood magnitude. We find that the reservoir-sediment pulse following dam removal was relatively small (97 000 ± 24 000 t over 4 years), owing to deliberate reservoir-sediment stabilization. Scaled to the size of the Carmel River watershed and compared against long-term bedrock denudation rates, the post-dam-removal sediment release was slightly less than the annualized long-term sediment export from this basin. New sediment transited >30 km to the river mouth in less than 2 years, assisted by floods 2 and 4 years after dam removal. The sediment pulse fined the downstream riverbed while causing mostly low-magnitude bed-elevation changes: commonly 0.5 to 1 m or smaller, occurring as discontinuous sediment patches or interstitial deposits, aside from the filling and subsequent partial scour of deep pools. There was no major geomorphic reset downstream from the dam site. Geomorphic changes were driven almost entirely by flow rather than by the modest increase in sediment supply, in contrast to recent examples from other large dam removals. The relatively minor disturbance caused by dam removal on the Carmel River is likely analogous to many future dam removals: a relatively small sediment pulse after deliberate limitation of reservoir-sediment erosion, and with an upstream dam remaining in place. Thus, a large dam removal need not lead to major downstream impacts.

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Section: Discussionmentioning

confidence: 99%

Six years of fluvial response to a large dam removal on the Carmel River, California, USA

East

Harrison

Smith

et al. 2023

Earth Surf Processes Landf

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“…The employment of RFID tracers for evaluating the effect of hydraulic structures (dams, weirs and check‐dams) on the longitudinal sediment continuity is an emerging topic of the last 3 years, with several dedicated field experiments in gravel‐bed rivers of Europe (Brenna et al, 2020; Brousse, Arnaud‐Fassetta, et al, 2020; Casserly et al, 2020, 2021; Galia et al, 2021; Gilet et al, 2021; Peeters et al, 2020) and North America (Fields et al, 2021; Magilligan et al, 2021). This reflects the growing concern of water management policies (e.g., EU Water Framework Directive) in restoring the connectivity of fragmented fluvial reaches, which are now common with the multiplication of in‐channel barriers (Belletti et al, 2020).…”

Section: Evaluating Human Effects On Bedload Transport Using Rfid Tagsmentioning

confidence: 99%

“…Active RFID tracers deployed in a braided river of the Southern French Alps showed that around 20% of the injected tracers crossed the dam gates during a 5‐year flood for which a full sluicing was operating (Brousse, Arnaud‐Fassetta, et al, 2020) (Figure 12). PIT tags were also recently used to document the effect of dam removal in a gravel‐bed river of NE France (Gilet et al, 2021) and showed that the bedload continuity has been efficiently restored, but the downstream channel morphology remained unchanged. Critical shear stress over the course of channel recovery following dam removal has been constrained with smart rocks equipped with PIT tags and accelerometers, providing evidences of the rapid post‐removal formation of a threshold channel (Fields et al, 2021).…”

Section: Evaluating Human Effects On Bedload Transport Using Rfid Tagsmentioning

confidence: 99%

Bedload tracing with RFID tags in gravel‐bed rivers: Review and meta‐analysis after 20 years of field and laboratory experiments

Liébault,

Piégay,

Cassel

et al. 2023

Earth Surf Processes Landf

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Soon after their first deployment in rivers in the early 2000s, RFID tags rapidly became the reference technology for bedload tracing in rivers. We can estimate from the literature that during the last 20 years, more than 30,000 RFID tracers have been injected in gravel‐bed rivers all around the world to study bedload transport. Many field experiments have been reported in a great diversity of fluvial environments, complemented by many laboratory experiments and methodological developments. This paper proposes a review of these works, notably based on the compilation of more than 350 RFID surveys, complemented by 97 magnetic surveys, for a total of 125 study sites. The meta‐analysis of this database shows that RFID tracers have improved our understanding of sediment transport in fluvial environments with rapid bedload dispersion. It is also shown that central positions of tracer plumes are moving faster over time than tracer leading fronts, as attested by a general relation between maximum and mean distances of transport. The most recent methodological developments based on the use of active UHF RFID tags show that it is now possible to conduct efficient bedload tracing experiments not only in small streams, but also in large gravel‐bed rivers or very active braided channels. Other addressed topics include RFID deployment and survey in river channels, controlling factors of tracer mobility (flow conditions, grain‐size and shape, channel morphology), bedload monitoring approaches using RFID tracers, and applications of RFID tracers for evaluating human effects on bedload transport. Key challenges of bedload tracing with RFID tags are also proposed.

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“…In general, it will seriously affect the normal life activities of aquatic organisms and even lead to the massive death of fish and benthic animals (Fremion et al, 2016; Moridi & Yazdi, 2017). Because the deposited sediment is typically discharged instantly during dam removal, the sediment content observed downstream of the dam can be up to 1,000 times higher than that under normal flow conditions (Gilet et al, 2021; Major, O'Connor, Podolak, Keith, & Wilcock, 2012). When fish are exposed to high sediment levels for a short period, there is often a serious acute lethal impact.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on acute impacts of hyper‐concentrated flow on Gymnocypris Eckloni and implication for sediment management

Baoligao

et al. 2023

River Research & Apps

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Significant increases in suspended sediment concentration (SSC) always occur during dam removal or sediment flushing processes, which could result in acute impacts on aquatic organisms. An analysis of the potential impact of the Huangheyuan hydropower dam removal on the upper reaches of the Yellow River is required for adaptive management. But the reports on the impact of high SSC on fishes living in rivers in the plateau areas are limited. Further studies on impact factors, fish behavior, and assessment methods were performed in this paper. The acute response of a typical fish, Gymnocypris eckloni, was tested by experiments with sediment concentrations ranging from 3.3 × 103 to 80.78 × 103 mg·L−1. The changes in fish aquatic surface respiration (ASR) behavior were analyzed under different SSCs. The cluster analysis of the environmental factors was conducted to analyze the relationship between the factors and fish mortality. The severity of ill effects (SEV) model was improved to assess the acute impact on fish. The results indicated that the SSC was the most related factor. The ASR could be induced by the SSC higher than 21 × 103 mg·L−1, and fish mortality was caused by SSC higher than 55 × 103 mg·L−1. The thresholds of SSC and exposure duration for fish protection were proposed to be less than 55 × 103 mg·L−1 and 6 hr, respectively. The findings could support the planning and regulation of dam sediment management on plateau areas.

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Morpho-sedimentary dynamics associated to dam removal. The Pierre Glissotte dam (central France)

Cited by 9 publications

References 55 publications

Six years of fluvial response to a large dam removal on the Carmel River, California, USA

Six years of fluvial response to a large dam removal on the Carmel River, California, USA

Bedload tracing with RFID tags in gravel‐bed rivers: Review and meta‐analysis after 20 years of field and laboratory experiments

Experimental study on acute impacts of hyper‐concentrated flow on Gymnocypris Eckloni and implication for sediment management

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