Influence of four run-of-river dams on channel morphology and sediment characteristics in Illinois, USA

Csiki, Shane; Rhoads, Bruce L.

doi:10.1016/j.geomorph.2013.10.009

Cited by 104 publications

(65 citation statements)

References 46 publications

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“…We obtained similar results with finer substratum and higher bottom organic matter in the upstream reach and coarser substratum downstream. However, changes in size substratum and depth around dams depend on many local factors, such as, spatial patterns of channel morphology and sedimentation can decrease because suspended sediment levels in the water decrease because of the presence of aquatic plants that accumulate sediment (Bond 2004;Skalak et al, 2009;Csiki & Rhoads, 2014). Despite it was expected a decrease in the number of taxa downstream of the weir, we did not found significant differences in richness between upstream and downstream reaches.…”

Section: Discussioncontrasting

confidence: 62%

Assessing disruption of longitudinal connectivity on macroinvertebrate assemblages in a semiarid lowland river

Leiva

Marchese²,

Diodato

et al. 2017

Acta Limnol. Bras.

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Cite as: Leiva, M. et al. Assessing disruption of longitudinal connectivity on macroinvertebrate assemblages in a semiarid lowland river. Acta Limnologica Brasiliensia, 2017, vol. 29, e19. Abstract: Aim: Our aim in this study was evaluate the effects of flow regulation for irrigation on the macroinvertebrate assemblages in a semiarid river. Methods: We sampled two reaches in Dulce River; one placed upstream a weir that diverts flow into a network of irrigation channels and the other downstream that weir, in the assessment of the fluvial discontinuity. We assess the differences among reaches and sites, environmental variables, invertebrate density, richness and Shannon-Wiener index applying non-parametric analyses of variance Kruskal Wallis. The similarity percentage analysis (SIMPER) was used to identify which species contributed to the dissimilarities on macroinvertebrate assemblage structure. Canonical Correspondence Analysis (CCA) was performed with the total set of samples to explore macroinvertebrate distribution in reaches and associations of the assemblages with habitat variables. Results: The density, richness and Shannon index values did not show differences between the reaches located upstream and downstream. Beta diversity (Whittaker) was 0.72 among upstream sites, 0.56 among downstream sites and higher species turnover (0.73) was obtained between both reaches. The Canonical Correspondence Analysis explained 46.71% of the variance differentiating upstream sites explained by higher values of organic matter of bottom sediments and discharge, high density of Nais communis, Bothrioneurum americanum, Pelomus, Stephensoniana trivandrana, Pristina menoni, P. jenkinae, P.longidentata, P. americana, Dero obtusa, Endotribelos, Heleobia and Turbellaria. The downstream sites were associated to coarser substratum and higher density of Lopescladius, Polypedilum, Cricotopus, Thienamaniella, Cryptochironomus, Baetidae, Nematoda and Corbicula fluminea. Conclusions: The low-flow disturbance had effects on the composition of the benthic invertebrate assemblages, but attributes (such as density and richness) showed a lower variability probably because of taxa replacement.

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Section: Discussioncontrasting

confidence: 62%

Assessing disruption of longitudinal connectivity on macroinvertebrate assemblages in a semiarid lowland river

Leiva

Marchese²,

Diodato

et al. 2017

Acta Limnol. Bras.

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“…In the sediments, there was a decreasing trend of percentage sand content and increasing trend of percentage clay, silt and total organic carbon content from upstream to downstream areas. This can be due to the reduced flow rate and increased amount of sediment load carried by the stream as it flows downstream as reported for lotic wetlands in many regions of the world (Bravard et al 2014;Csiki and Rhoads 2014;Yang et al 2014). All the annelids recorded in the present study were of Class Oligochaeta which is considered as pollution tolerant class (Sarang and Sharma 2009).…”

Section: Discussionsupporting

confidence: 57%

Evaluation of the water and sediment quality of a lotic water-body in the western coastal region of Sri Lanka using Rapid Bioassessment Protocol II (RBP II) of benthic macroinvertebrates

Wijeyaratne

Kalaotuwawe

2017

Sri Lanka J. Aquat.

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The biotic indices used in Rapid Bioassessment Protocol II (RBP II) developed by United States Environmental Protection Agency was used to assess the feasibility of using benthic macroinvertebates as bio-indicators for monitoring water and sediment quality in Ja-Ela stream, which is a lotic water body in the western coastal region of Sri Lanka. Five study sites to cover the entire length of the stream, which are in five different fringing land uses (undisturbed site, agricultural site, industrial discharge receiving site, densely populated urban site and a site close to the mouth of the stream) were sampled for water and sediment quality parameters and benthic macroinvertebrates from April to October 2015. Shannon-Weiner diversity index (H`), Hilsenhoff Family Biotic index (FBI), Taxa richness (TRI), and Ehemeroptera, Plecoptera and Trichoptera (EPT) index were calculated for each site. Results indicated significant spatial variations in BOD5, COD, visibility, nitrate concentration and total phosphorus concentrations in the water, and total organic carbon content and particle size distribution in sediments. The highest mean values for H' (2.38), TR (13.6) and EPT (6.2) were recorded from the undisturbed site. Significantly higher FBI values are recorded from the industrial discharge receiving site (6.97) and the urban site (6.81), indicating that they are the most polluted sites with higher degree of organic pollution than other sites. These biotic index values showed significant correlations with sediment and water quality characteristics of the study sites (R2 >0.5, p<0.05) The H', EPT, FBI and TR values for benthic macro-invertebrate community showed that the upstream portion of this stream is habitable to pollution sensitive taxa, while the downstream areas close to its opening to Negombo estuary are habitable by pollution tolerant taxa. Results of the present study identified the RBP II as a possible bio monitoring protocol to reflect the water and sediment quality in the Ja-Ela stream.

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“…Based on their modelling results, Baker et al (2011) also concluded that small, low-gradient streams with smaller-sized substrate were more susceptible to fine-sediment accumulation than large streams. However, RoR dams that are regularly overtopped at high flows are expected to experience fewer discontinuities in the morphological and sediment size distribution of stream channels (Kondolf 1997;Csiki and Rhoads 2013;Kibler and Tullos 2013). The proportion of flow diverted is also of importance for the transport of sediments.…”

Section: Pathway 2: the Presence Of Low-head Damsmentioning

confidence: 99%

Run-of-River hydropower and salmonids: potential effects and perspective on future research

Gibeau

Connors

Palen

2017

Can. J. Fish. Aquat. Sci.

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Abstract:The spatial footprint of individual run-of-river (RoR) hydropower facilities is smaller than reservoir-storage hydroelectric projects and their impacts to aquatic ecosystems are often assumed to be negligible. However, these effects are poorly understood, especially for salmonids whose freshwater habitat often overlaps with RoR hydropower potential. Flow regulation for RoR hydropower is unique in how it influences the seasonality and magnitude of flow diversion and because low-head dams can be overtopped at high flows. Based on a review of the primary literature, we identified three pathways of effects by which RoR hydropower may influence salmonids: reduction of flow, presence of low-head dams impounding rivers, and anthropogenic flow fluctuations. We synthesized empirical evidence of effects of RoR hydropower on river ecosystems from 31 papers, of which only 10 explicitly considered salmonids. We identified key research gaps including impacts of extended low-flow periods, anthropogenic flow fluctuations, and cumulative effects of multiple RoR projects. Filling these gaps is necessary to help manage and conserve salmonid populations in the face of the growing global demand for small-scale hydropower.Résumé : L'empreinte spatiale individuelle des centrales hydroélectriques au fil de l'eau est moindre que celle des centrales hydroélectriques avec réservoirs de retenue et, en conséquence, leurs impacts sur les écosystèmes aquatiques sont souvent jugés négligeables. Par contre, leurs effets écologiques sont peu connus, particulièrement pour les salmonidés dont l'habitat en eau douce coïncide souvent avec le potentiel hydroélectrique des centrales au fil de l'eau. La régulation des eaux par les centrales au fil de l'eau se distingue par son influence sur la saisonnalité et l'ampleur de la déviation des eaux, et parce que les barrages de basse-chute peuvent être submergés lors des crues. À la lumière d'un examen des sources documentaires primaires, nous avons cerné trois voies principales par lesquelles la production d'électricité des centrales au fil de l'eau peut influencer les salmonidés, soit la réduction des débits, la présence de barrages de basse-chute sur les rivières et des fluctuations d'origine humaine des débits. Nous avons produit une synthèse des résultats empiriques de 31 études portant sur les effets de la production d'hydroélectricité des centrales au fil de l'eau sur les écosystèmes lentiques, dont seulement dix s'intéressaient explicitement aux salmonidés. Nous avons cerné d'importantes lacunes dans les connaissances actuelles, dont l'impact de périodes prolongées de faible débit, des fluctuations d'origine humaine des débits et des effets cumulatifs de plusieurs centrales au fil de l'eau. Il est nécessaire de combler ces lacunes pour soutenir la gestion et la conservation durables des populations de salmonidés dans un contexte de demande mondiale croissante pour la production d'hydroélectricité à petite échelle.

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Influence of four run-of-river dams on channel morphology and sediment characteristics in Illinois, USA

Cited by 104 publications

References 46 publications

Assessing disruption of longitudinal connectivity on macroinvertebrate assemblages in a semiarid lowland river

Assessing disruption of longitudinal connectivity on macroinvertebrate assemblages in a semiarid lowland river

Evaluation of the water and sediment quality of a lotic water-body in the western coastal region of Sri Lanka using Rapid Bioassessment Protocol II (RBP II) of benthic macroinvertebrates

Run-of-River hydropower and salmonids: potential effects and perspective on future research

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