Effect of low-head dams on reach-scale suspended sediment dynamics in coarse-bedded streams

Casserly, Colm M.; Turner, Jonathan; Sullivan, John J.; Bruen, Michael; Bullock, Craig; Atkinson, Siobhán; Kelly‐Quinn, Mary

doi:10.1016/j.jenvman.2020.111452

Cited by 12 publications

(5 citation statements)

References 39 publications

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“…To achieve knowledge as comprehensive as possible, additional data have to be considered as a time series of hydrological (discharges and stages) and piezometric data that can be used conjointly to estimate changes in channel depth and conveyance (Biedenharn & Watson, 1997; Pinter & Heine, 2005; Ruiz‐Villanueva et al, 2023). Measures of sediment transport in relation to hydrological data are important to demonstrate the link between sediment regimes, alterations in sediment flux and sediment connectivity and morphological changes (Casserly et al, 2021; Dépret et al, 2023, 2019; Liébault & Piégay, 2001; Scorpio et al, 2024; Vázquez‐Tarrío et al, 2019). Quantification of sediments extracted for gravel mining or trapped at retention works and dams can allow for estimating the volumes subtracted from rivers (De Vincenzo et al, 2017; Scorpio et al, 2024).…”

Section: Discussionmentioning

confidence: 99%

“…Reach scale changes and drivers must always be considered within an integrated catchment perspective, bearing in mind that there is a time lag between causes and effects and that each anthropogenic action will cause effects propagating both upstream and downstream. This is a scientific and practical challenge because the most appropri- between sediment regimes, alterations in sediment flux and sediment connectivity and morphological changes (Casserly et al, 2021;Dépret et al, 2023Dépret et al, , 2019Liébault & Piégay, 2001;Scorpio et al, 2024;Vázquez-Tarrío et al, 2019). Quantification of sediments extracted for gravel mining or trapped at retention works and dams can allow for estimating the volumes subtracted from rivers (De Vincenzo et al, 2017;Scorpio et al, 2024).…”

Section: Recommendations and Next Stepsmentioning

confidence: 99%

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Channel changes over the last 200 years: A meta data analysis on European rivers

Scorpio,

Comiti,

Liébault

et al. 2024

Earth Surf Processes Landf

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The combined analysis of past evolutionary trajectories of channel morphology and temporal patterns of driving factors is fundamental to understanding present river conditions, supporting river management and evaluating future changes. Rivers in Europe underwent important channel changes during the Anthropocene in response to changing natural drivers and anthropogenic pressures. A considerable number of papers have been published on this topic, in the last decades. In this study, a comprehensive meta‐analysis on channel changes during the last 200 years in Europe was performed, aiming to provide quantitative information on the intensity of changes, to highlight regional scale similarities and dissimilarities in evolutionary morphological trajectories and to discuss the main causes of such changes. Based on a review, 102 papers were selected, addressing 145 channel reaches flowing through five main mountain ranges (Iberians, Alps, Apennines, Balkans and Carpathians) in the southern and eastern parts of Europe. The results show that active channel narrowing (between 26% and 36% on average) and incision (between 1 and 2 m) prevailed in most rivers between the 1800s and the 1950s, although widening was documented in some rivers of the Alps and the Apennines. Most multi‐thread reaches maintained their pattern until the mid‐20th century. Active channel changes accelerated during the 1950s–1990s (or 2000s) period, with channel narrowing up to 60% and channel incision up to 14 m. Multi‐thread patterns strongly decreased in frequency, with anabranching channels disappearing and single‐thread patterns becoming predominant. The cumulative effect of multiple and concomitant human pressures (gravel mining, channelisation and damming) was identified as the main driving factor for these accelerated changes. These findings must feed the public debate about preventing alterations of river ecosystems—exerted by anthropic disturbances—in a context of rapid economic development, especially in river systems still poorly altered and thus preserving wide, active and heterogeneous fluvial corridors.

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Section: Discussionmentioning

confidence: 99%

Section: Recommendations and Next Stepsmentioning

confidence: 99%

Channel changes over the last 200 years: A meta data analysis on European rivers

Scorpio,

Comiti,

Liébault

et al. 2024

Earth Surf Processes Landf

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“…Hydrological variables and the relevant flow regime are part of the "hydro-morphological quality elements" (European Communities, 2000), supporting BQEs and the consequent induced or inhibited longitudinal trends of improvement. Hydro-morphological conditions are also responsible for altering the values of some basic parameters as water temperature (Т), dissolved oxygen (DO), total suspended solids (Meißner et al, 2018;Casserly et al, 2021, Dolédec et al, 2021 and the concentration of nutrients (Dusabe et al, 2022).…”

Section: N O N -C O M M E R C I a L U S E O N L Ymentioning

confidence: 99%

Longitudinal recovery gradient of macroinvertebrates during different hydrological scenarios in a downstream river reach

Dimitrov

2023

J Limnol

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Macroinvertebrate community composition in regulated rivers is highly dependent on high and low flow events. Significant reduction or augmentation of the flow downstream from a dam can lead to a decrease in the variety of the sensitive macrozoobenthic taxa. Such decreases may lead to a degraded ecological status. In this research, the macrozoobenthic community was investigated in a river section downstream of a multipurpose dam with strategic significance for northeast Bulgaria. Samples were collected for five years from the Golyama Kamchia River, in close proximity to the Ticha dam. Three sampling sites were established in a longitudinal gradient, from 75 to 1770 meters from the dam. Sixteen invertebrate samples were taken between 2017 and 2021. Double sampling (spring and autumn) was conducted in 2019. The goal was to find how macroinvertebrate communities are influenced by the dam-induced modified environmental conditions, from the management of the dam, and which of the parameters is considered to have the strongest effect. Likewise for the study was important to understand longitudinal recovery gradients from the application of the present “minimum acceptable flow – compensation flow” in hydrologically differing years. The main physicochemical parameters were measured alongside the velocity of the water at each sampling site. Additionally, the maintained hydrological regime was explored for a relationship by several hydrological indices with the macroinvertebrate community composition. The analysis of the biological data through 7 biological indices showed that hydrologically sensitive taxa (Ephemeroptera, Plecoptera and Trichoptera - EPT) were very good indicators for damming impact, detecting disturbances not so well differentiated by other type-specific indices and the resulting ecological status. The order Trichoptera was the most influenced taxa group during the study. In 2020 the base flow released from the dam dropped to its lowest level (0.095 m3 s-1 from 0.552 m3 s-1) for an explored 10-year period of hydrology. This event continued for more than a year and led to a rupture of the previously observed recovery gradient. Downstream of the second sampling site, at about 800 m below the dam wall, a decrease in the number of trichopteran families was observed and at the third site, at 1.8 km from the dam they were significantly reduced.

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“…Large-scale water conservancy projects, integral for flood control and power generation, induce alterations in the dynamics of water and sediment discharge, disrupting the adaptive equilibrium between water and sand conditions and river morphology [4][5][6], leading to responsive siltation adjustments in the riverbed downstream of the dam [7]. So far, more than tens of thousands of dams have been constructed worldwide, changing the natural runoff and sediment processes [8].…”

Section: Introductionmentioning

confidence: 99%

Hydrological Changes and Sediment Dynamics in the Inner Mongolia Section of the Yellow River: Implications for Reservoir Management

Xu,

Zhao,

Chen

et al. 2024

Water

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The Inner Mongolia section of the Yellow River is a primary alluvial segment of the main channel. The variations in water and sediment not only alter the cross-sectional morphology and flow capacity of the river but also impact the scheduling of upstream cascade reservoirs. Based on runoff and sediment load data and topographic information from typical hydrological stations, the characteristics of runoff and sediment load variations and the evolutionary pattern of siltation in the Inner Mongolia River section were analyzed via trend analysis methods, Mann–Kendall test methods, the sediment load transport rate method, and the water level–flow relationship. The results showed that the water and sediment loads at the hydrological stations in the Inner Mongolia River section significantly changed from the 1960s to after 2000, with runoff decreasing by approximately 22% to 32% and the sediment load decreasing by approximately 65% to 73%. Sedimentation in the river section generally increased, and the average annual siltation amount reached 0.144 billion t. The joint utilization of the Longyangxia and Liujiaxia reservoirs in 1987 was the main reason for the rapid increase in siltation, and siltation in the Inner Mongolia River section was slightly reduced after 2005. In addition, the critical sediment load coefficients of the Bayangaole–Sanhuhekou and Sanhuhekou–Toudaoguai River sections were 0.0073 and 0.0051 kg·s/m6, respectively, from 1952 to 1968, and 0.0053 and 0.0037 kg·s/m6, respectively, from 1969 to 2020. This study could provide technical support for river flood control and reservoir water sediment regulation in Inner Mongolia.

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Effect of low-head dams on reach-scale suspended sediment dynamics in coarse-bedded streams

Cited by 12 publications

References 39 publications

Channel changes over the last 200 years: A meta data analysis on European rivers

Channel changes over the last 200 years: A meta data analysis on European rivers

Longitudinal recovery gradient of macroinvertebrates during different hydrological scenarios in a downstream river reach

Hydrological Changes and Sediment Dynamics in the Inner Mongolia Section of the Yellow River: Implications for Reservoir Management

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