Geomorphic effects of a run-of-the-river dam in a multi-driver context: The case of the Upper Garonne (Central Pyrenees)

Bulteau, Théo; Batalla, Ramón J.; Chapron, Emmanuel; Valette, Philippe; Piégay, Hervé

doi:10.1016/j.geomorph.2022.108243

Cited by 4 publications

(5 citation statements)

References 49 publications

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“…For understanding and assessment of the effect of different drivers on channel incision, we select the BACI approach that compared pre‐state (Before), post‐state (After) and reach ( Control ) that is not affected by potential external effects. The method was applied for assessment restoration (Marteau et al, 2022) but is applicable for assessing any impacted river system with the different spatial manifestations of channel transformation (Bulteau et al, 2022). The Before‐After approach (time scale) is related to the pre‐state situation in 1949 and before the main channelisation works that started in the 1950s.…”

Section: Methodsmentioning

confidence: 99%

“…Previous studies focus primarily on the actual state and description of the past events, concentrating on the single reach without differentiating the control and impact sections. Generally, the BACI (Before‐After‐Control‐Impact) approach is developed for understanding the effect of revitalisation, but it is applicable for understanding the impact of any drivers or changes in the river channel (Bulteau et al, 2022). Separation of upstream and downstream controls, and local and catchment controls based on a multi‐BACI approach, is still lacking and challenging for understanding river incision.…”

Section: Introductionmentioning

confidence: 99%

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Inferring channel incision in gravel‐bed rivers: Integrating LiDAR data, historical aerial photographs and drone‐based SfM topo‐bathymetry

Rusnák,

Kaňuk,

Kidová

et al. 2024

Earth Surf Processes Landf

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Channel incision is an evident trend for river evolution in many European rivers and notably the Western Carpathians, whose former braided and multichannel wandering river system is transforming into a single‐thread channel, but it is often difficult to separate drivers and determine if incision is finished or is still ongoing. To overpass these research gaps, this paper presents an innovative approach to assess the multidecadal incision of the Belá River in the Western Carpathians since 1949 by LiDAR‐based analyses of floodplain surfaces above the river channel dated from historical aerial images. Detailed analyses of ongoing incision were also calculated based on DEM of differences (DoD) using Structure‐from‐Motion (SfM) photogrammetry‐derived topo‐bathymetric models. The study applied the BACI (Before‐After‐Control‐Impact) approach that compared pre‐state (Before), post‐state (After) and reach (Control) that is not affected by potential external effects with degraded (impacted) reach to be able to distinguish the driver effects. Floodplain channel surface analyses indicate the maximum incision up to 4 m and incision rate of 5.7 cm/year that occurred in the most degraded reach. Moreover, cross‐section profiles point to accelerated incision of 24.5 cm/year in the last 10 years (2011–2021) by the propagation of incision upstream. Overall, the net changes from the UAV survey pointed to 22 759 m3 of gravel sediments, constituting outwash from the 1.6 km long channel system (2015–2022) by incision, whereas analyses of historical channel surfaces estimated erosion of 573 303 m3 from impacted reaches between 1949 and 2020. Incision evidence is only observed in the downstream part below the control section due to local drivers (channel regulation, comprising embankment and gravel mining that activated a backward erosion of the system with knickpoint migration upstream). This analysis shows the benefits of combining different sources of data to separate long‐term and ongoing channel responses and the BACI‐approach to better target cause–effect relationships in space and time.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inferring channel incision in gravel‐bed rivers: Integrating LiDAR data, historical aerial photographs and drone‐based SfM topo‐bathymetry

Rusnák,

Kaňuk,

Kidová

et al. 2024

Earth Surf Processes Landf

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“…So, without properly elucidating the concerned drivers and stressors, managers and decision-makers may propose misdirected or counter-productive policies (Srinivasan et al, 2015). Unravelling these important factors requires the analysis of the long-term hydrological patterns, with the identification of temporal trajectories and the analysis of the main contributors involved in the observed trends (Bulteau et al, 2022). Assessing the consistency in the patterns of drivers (i.e., climate, land, and water uses) and stressors (i.e., groundwater overexploitation, nutrients and contaminants loads), and their relation to the hydrological regimes, provides the ground for developing a proper interpretation of the hydrological dynamics of the basin.…”

Section: Introductionmentioning

confidence: 99%

Disclosing the effects of climate, land use, and water demand as drivers of hydrological trends in a Mediterranean river basin

Córdoba-Ariza,

Batalla,

Sabater

et al. 2024

Limnetica

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Mediterranean basins face significant water scarcity which demands examining long-term data to prospect their trends in water availability and quality. This study focuses on The Onyar River (Inner Catalan basins, NE Spain), to explore its historical streamflow changes, the influencing climatic and land-use factors, and the consequential impacts on water quality. We analyse key hydro-climatic variables—streamflow, precipitation, temperature, and evapotranspiration (both PET and AET)— across a 60-year span (1960 -2020) and their relationship with recent stream water chemistry data (2007-2020). We compare these patterns to the changes in land use, and to the variations in water demand according to urban use, livestock, and crop production estimates. Our findings highlight a consistent decline in streamflow, most pronounced over the last two decades, accompanied by an increase in PET, and a probable decrease in groundwater recharge. Notably, these changes co-occurred with higher concentrations of river water ammonium and nitrate. We attribute these patterns to changes in land use such as afforestation and intensive fertilization, as well as increased groundwater withdrawal, particularly during irrigation seasons. Additional factors include growing urban water demand and the discharges of treated wastewater back into the river system. This study offers a comprehensive overview of the declining water quantity and quality in the Onyar River, attributing these trends to an interplay of climatic and anthropogenic factors. The findings underscore the need for integrated water resource management strategies to mitigate the implications of these changes.

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“…In the first two stages, the reduction in sediment flux over the weir can result in a milder equilibrium bed slope, pronounced bed degradation, and coarser surface material downstream (Bulteau et al., 2022; Casserly et al., 2020; Galia et al., 2016; Magilligan et al., 2021; Martín‐Vide & Andreatta, 2009). The degradation depth caused by weirs is reported to be in the range of 0.4–6.9 m in decades (Bulteau et al., 2022; Galia et al., 2016; Korpak et al., 2021; Martín‐Vide & Andreatta, 2009), much lower than that observed in the Shi‐ting River. Besides the differences in channel size, weir height and the flow discharge, the combined effect of weirs, sand input, and mining could play an important role in bed degradation.…”

Section: Introductionmentioning

confidence: 99%

“…There are three major stages related to how a weir can affect bedload transport: the first consists of trapping all bedload, the second consists of partial trapping of bedload, and at the third stage, the weir no longer traps any bedload (Pearson & Pizzuto, 2015). In the first two stages, the reduction in sediment flux over the weir can result in a milder equilibrium bed slope, pronounced bed degradation, and coarser surface material downstream (Bulteau et al., 2022; Casserly et al., 2020; Galia et al., 2016; Magilligan et al., 2021; Martín‐Vide & Andreatta, 2009). The degradation depth caused by weirs is reported to be in the range of 0.4–6.9 m in decades (Bulteau et al., 2022; Galia et al., 2016; Korpak et al., 2021; Martín‐Vide & Andreatta, 2009), much lower than that observed in the Shi‐ting River.…”

Section: Introductionmentioning

confidence: 99%

Degradation of a Foreland River After the Wenchuan Earthquake, China: A Combined Effect of Weirs, Sediment Supply, and Sediment Mining

Lin,

An,

Zheng

et al. 2023

Water Resources Research

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Since the 2008 Wenchuan (Ms. 8.0) Earthquake, the foreland rivers of the Longmen Mountains have suffered from significant bed degradation, among which the Shi‐ting River has experienced the largest local degradation of more than 20 m in 7 years. Potential reasons of the dramatic degradation include: (1) sediment disconnectivity due to in‐channel weirs; (2) the mobilization effect on gravel of an increased sand supply as a result of earthquake‐induced landslides; and (3) sediment extraction due to intensive mining. In this paper, we study the complex interaction among the above‐mentioned factors in the Shi‐ting River, using a one‐dimensional river morphodynamic model. Simulation results show that in‐channel weirs can reduce bedload transport and lead to bed degradation that is proportional to weir height. When coupled with additional sand supply, the weirs preferentially trap gravel and deliver sand, augmenting the downstream mobility of gravel and thus the degradation. For the Shi‐ting River, the simulated bed degradation agrees well with the observation when an annual sediment mining of 16 million tons is implemented in the simulation, along with the effects of in‐channel weirs and sand supply. The contribution of sediment mining is one order of magnitude larger than the coupling effect of weirs and sand supply. Both the simulation and observation show that the largest bed degradation occurs downstream of the Renmin Weir, due to the large spatial interval between the Renmin Weir and the next grade control structure.This article is protected by copyright. All rights reserved.

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Geomorphic effects of a run-of-the-river dam in a multi-driver context: The case of the Upper Garonne (Central Pyrenees)

Cited by 4 publications

References 49 publications

Inferring channel incision in gravel‐bed rivers: Integrating LiDAR data, historical aerial photographs and drone‐based SfM topo‐bathymetry

Inferring channel incision in gravel‐bed rivers: Integrating LiDAR data, historical aerial photographs and drone‐based SfM topo‐bathymetry

Disclosing the effects of climate, land use, and water demand as drivers of hydrological trends in a Mediterranean river basin

Degradation of a Foreland River After the Wenchuan Earthquake, China: A Combined Effect of Weirs, Sediment Supply, and Sediment Mining

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