Classification of geomorphological effects downstream of dams

Brandt, S. Anders

doi:10.1016/s0341-8162(00)00093-x

Cited by 619 publications

(498 citation statements)

References 52 publications

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“…A third group of studies applied statistical analyses and metrics based on regime theory to describe the long-term effects of river engineering and human interferences on rivers. Commonly used metrics are, for example, mean channel width and longitudinal slope (e.g., Church, 1995;Brandt, 2000;Surian and Rinaldi, 2003;Ronco et al, 2010). However, these studies have not addressed the short-term response of bars and branches on the long-term equilibrium conditions.…”

Section: Bar and Channel Dynamics In Braided Riversmentioning

confidence: 99%

“…Discharge variation is attenuated by human-made hydropower dams and water storages, and affects the downstream morphodynamics (Brandt, 2000). Many river modeling studies have applied constant discharge, assuming a morphologically dominant or representative discharge exists that gives similar yearly morphodynamics to the "real" hydrograph (e.g., Nicholas, 2010;Schuurman et al, 2013).…”

Section: Disturbances In Braiding Riversmentioning

confidence: 99%

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Network response to disturbances in large sand-bed braided rivers

2016

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Abstract. The reach-scale effects of human-induced disturbances on the channel network in large braided rivers are a challenge to understand and to predict. In this study, we simulated different types of disturbances in a large braided river to get insight into the propagation of disturbances through a braided channel network. The results showed that the disturbances initiate an instability that propagates in the downstream direction by means of alteration of water and sediment division at bifurcations. These adjustments of the bifurcations change the migration and shape of bars, with a feedback to the upstream bifurcation and alteration of the approaching flow to the downstream bifurcation. This way, the morphological effect of a disturbance amplifies in the downstream direction. Thus, the interplay of bifurcation instability and asymmetrical reshaping of bars was found to be essential for propagation of the effects of a disturbance. The study also demonstrated that the large-scale bar statistics are hardly affected.

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Section: Bar and Channel Dynamics In Braided Riversmentioning

confidence: 99%

Section: Disturbances In Braiding Riversmentioning

confidence: 99%

Network response to disturbances in large sand-bed braided rivers

2016

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“…Bien que les effets de la régulation des crues par un barrage sur la morphologie (PETTS, 1979 ;BRANDT, 2000) et la biologie (POWER ef al., 1996) soient relativement connus, il semble que les conséquences morphologiques et biologiques de l'inversion du régime hydrologique d'un cours d'eau ne soient pas encore bien documentées dans la littérature. Ceci est encore plus vrai pour le Québec où la qualité des habitats d'hiver peut jouer un rôle crucial pour la vie aquatique.…”

Section: Seasonal Discharge Coefficients Upstream and Downstream Fromunclassified

“…Comme l'avait déjà fait remarquer VIVIAN (1994) même dans la littérature internationale, très peu de travaux existent sur les impacts des barrages sur les régimes hydrologiques de cours d'eau (MAHESHWARl et al, 1995 ;ASSANl étal., 1999 ;ERSKINE ef al., 1999 ;LOIZEAU et DOMINIK, 2000). La plupart des travaux sont consacrés à l'analyse des impacts morphodynamiques (PETTS, 1979 ;AMOROS et PETTS, 1993 ;BRANDT, 2000) ou biologiques (PETTS, 1984 ;LIGON ef al., 1995 ;POWER ef al., 1996). Pourtant, ces impacts morphologiques et biologiques dépendent en grande partie des modifications qui affectent les régimes des débits (ASSANl, 1997), d'où l'intérêt de quantifier ces modifications.…”

Section: -Introductionunclassified

Analyse d'impacts d'un barrage sur le régime hydrologique de la rivière Matawin (Québec, Canada)

Assani¹,

Buffin‐Bélanger²,

Roy³

2005

rseau

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Malgré la présence de nombreux barrages au Québec, peu d'études ont été consacrées à l'analyse des impacts de ces ouvrages sur les régimes hydrologiques des cours d'eau. La présente note a pour but d'analyser les impacts d'un barrage sur le régime hydrologique de la rivière Matawin en comparant le régime hydrologique de la rivière en amont (1390 km2) et en aval (4070 km2) du barrage pendant une période de 60 ans (1930-1990) et sur trois échelles temporelles distinctes. A l'échelle interannuelle, l'influence du barrage se manifeste par une persistance plus marquée des effets des épisodes humides ou secs ainsi qu'une hausse ou une baisse des débits moyens annuels respectivement durant ces périodes. Mais cette succession et cette persistance n'ont pas affecté significativement la stationnarité de la série hydrologique. Aux échelles mensuelles et saisonnière, l'influence du barrage se manifeste par une inversion du régime hydrologique caractérisée par une hausse des débits hivernaux et une baisse des débits printaniers. Cette influence se traduit aussi par une baisse significative du débit maximum mensuel mais une hausse du débit minimum mensuel. Il en résulte une diminution du coefficient d'immodération. A l'échelle journalière, le barrage modifie la période d'occurrence des débits extrêmes minimums et maximums. Il provoque la diminution significative des débits extrêmes minimums et maximums. Mais l'écrêtement des crues est modéré pour les débits de récurrence=10 ans. L'impact le plus significatif du barrage de Matawin est sans nul doute l'inversion du régime hydrologique dont les conséquences morphologiques et biologiques ne sont pas encore documentées dans la littérature scientifique canadienne. Cette inversion résulte du faible écoulement hivernal et d'une forte production de l'énergie électrique pendant la saison froide.Few studies have characterized the effect of dams on the hydrologic regime of rivers in Quebec. This is rather strange given the large number of hydroelectric dams that have been constructed in the province. To shed some light on the environmental impact of these dams, this paper aims at describing and quantifying the effect of the Matawin River dam on the hydrologic regime of the river on an annual, seasonal and daily basis. The Matawin River is located north of the St-Lawrence River and is a tributary of the St-Maurice River. The Matawin dam was built in 1929 by Shawinigan Water and Power Co. mainly to supply the Gabelle hydroelectric dam on the Saint-Maurice River. The dam is 26 m high and the storage capacity of the reservoir is 348,000,000 m3 when full. The catchment area of the dam is 4070 km2.To assess the effect of the dam, we used various statistical methods to compare discharge time series over 60 years as measured at two gauging stations on the river. One of the stations is located upstream whereas the other one is located downstream from the Matawin dam. The upstream drainage basin covers an area of 1390 km2. No major tributaries are found between the two gauging stations, thus allowi...

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“…The inclusion of varying spatiotemporal scales within a classification system provides the user with the capability to account for the full scope of flow-ecology relationships within a study area (Brandt 2000;Rowntree and Wadeson 1998). Approaches to capture spatiotemporal variation in rivers can also be seen in studies that attempt to classify catchments under varying hydrologic periods as a means to provide predictions to determine how environmental impacts in one system could influence another similar system (Wagener et al 2007;Snelder, Biggs, and Weatherhead 2004;Reidy Liermann et al 2011).…”

Section: Literature Reviewmentioning

confidence: 99%

GIS Framework for Large River Geomorphic Classification to Aid in the Evaluation of Flow-Ecology Relationships

Vernon¹,

Arntzen²,

Richmond³

et al. 2013

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Providing a means to quantitatively define flow-ecology relationships is integral in establishing flow regimes that are mutually beneficial to power production and ecological needs. This paper presents a geographic information system (GIS) framework for large river geomorphic classification that is flexible, accurate, and easily integrated with Ecological Limits of Hydrologic Alteration (ELOHA) initiatives. A case study was conducted integrating the base geomorphic aspect of this framework with the Modular Aquatic Simulation System two-dimensional (MASS2) hydraulic model and field collected data to establish optimal juvenile salmonid rearing habitat under varying flow regimes throughout an impounded portion of the lower Snake River, USA. Defining regions of optimal juvenile salmonid habitat at varying flows was used to distinguish areas that have a high potential for the creation of additional shallow water habitat. Findings indicated that the potential to create additional shallow water habitat does exist for juvenile salmonid rearing regardless of the flow scenario (discharge exceedence levels of 1, 25, 50, 75, and 99 percent) for the sample time frame (May -June 2011). The left-bank habitat of the lower Snake River was also found to be preferable for juvenile salmon rearing compared to right-bank habitat. The results from the case study suggest that the GIS framework is a capable tool when used to diagnose flow-ecology relationships. Additionally, an alternative hydrologic classification system is explored that couples well with the geographically independent nature of this GIS framework. Future applications of this framework are to utilize it in other large river systems throughout the contiguous United States. The framework also allows for the organization of large river data to be quickly accessed and used for multi-river comparison and analysis. Future development of a backend database within an interactive web platform would be highly beneficial to create a readily available and standardized mechanism to facilitate classification efforts conducted at the national scale.iv

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Classification of geomorphological effects downstream of dams

Cited by 619 publications

References 52 publications

Network response to disturbances in large sand-bed braided rivers

Network response to disturbances in large sand-bed braided rivers

Analyse d'impacts d'un barrage sur le régime hydrologique de la rivière Matawin (Québec, Canada)

GIS Framework for Large River Geomorphic Classification to Aid in the Evaluation of Flow-Ecology Relationships

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