Floodplain evolution in a confluence zone: Paraná and Ivaí rivers, Brazil

Morais, Eduardo Souza de; Santos, Manoel Luís dos; Cremon, Édipo Henrique; Stevaux, José Cândido

doi:10.1016/j.geomorph.2015.12.017

Cited by 17 publications

(5 citation statements)

References 42 publications

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“…As an alluvial river section, the lower Ivaí River basin is functionally associated with the upper Paraná River floodplain in the confluence of the Paraná and Ivaí Rivers. That floodplain is currently affected by flood events caused by both rivers (Morais et al, 2016). The Ivaí River differs from the Paraná River by the predominance of suspended load consisting mostly of silt and clay (Morais et al, 2016), which is likely associated with limnological parameters (i.e.…”

Section: Discussionmentioning

confidence: 99%

“…That floodplain is currently affected by flood events caused by both rivers (Morais et al, 2016). The Ivaí River differs from the Paraná River by the predominance of suspended load consisting mostly of silt and clay (Morais et al, 2016), which is likely associated with limnological parameters (i.e. environmental heterogeneity) as turbidity and electrical conductivity (Peláez & Pavanelli, 2019).…”

Section: Discussionmentioning

confidence: 99%

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Spatial distribution patterns and predictors of fish beta‐diversity in a large dam‐free tributary from a Neotropical floodplain

et al. 2021

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Understanding how and why fish species composition varies between locations through beta-diversity has received increased interest recently. The physical structure, extension and environmental characteristics along the river basins influence the dispersal of organisms, which ultimately affects metacommunity dynamics and biodiversity patterns. Here, we aimed to identify major breaks delimiting fish assemblages in a large dam-free river basin on its main channel, which is almost pristine in hidrology, and to evaluate the influence of geo-climatic variables in the observed beta-diversity patterns. We used the statistical techniques Species Composition Interpolation (SCI) and Generalized Dissimilarity Modeling (GDM) to analyse betadiversity patterns based on georeferenced fish records from the Ivaí River basin. Ichthyofauna units were delimited, estimating the association between geo-climatic predictors and beta-diversity. We identified three major breaks delimiting fish assemblages in the Ivaí River basin (i.e. the upper, middle and lower sections). The fish communities were very distinct at the upper and lower sections, while the middle section was recovered as less differentiated. Turnover was the main component contributing to total beta-diversity, and dissimilarity in fish species composition was moderately associated with geo-climatic variables. Fish communities from the Ivaí River basin must be associated with niche-based processes, and we hypothesize that dispersal processes can be equally significant at the basin scale. The investigations may produce insights on strategies for conservation and restoration of degraded rivers, contributing to the long-term maintenance of fish communities and to the delimitation of new strategic areas for the effective conservation of freshwater biodiversity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Spatial distribution patterns and predictors of fish beta‐diversity in a large dam‐free tributary from a Neotropical floodplain

et al. 2021

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“…Generally, floodplain styles along ephemeral streams overlap substantially with those on perennial streams (e.g., Nanson & Croke, 1992), where floodplains have also been found to vary in style spatially and temporally (e.g., Benda et al, 2004; De Morais et al, 2016). One exception to the similarities with perennial streams is floodouts, which are a floodplain style typically unique to ephemeral stream systems.…”

Section: Identifying and Classifying Ephemeral Stream Floodplainsmentioning

confidence: 99%

“…inset floodplains commonly repeat in sequence with unconfined or unchannelled floodplains (e.g.,Schumm & Hadley, 1957;Wakelin- King & Webb, 2007). Through time (typically centuries to millennia), confined alluvial floodplains within incised channels can fill, and new floodplains can develop within the now unconfined stream corridor(Gellis et al, 2017).Generally, floodplain styles along ephemeral streams overlap substantially with those on perennial streams (e.g.,Nanson & Croke, 1992), where floodplains have also been found to vary in style spatially and temporally (e.g.,Benda et al, 2004;De Morais et al, 2016). One exception to the similarities with perennial streams is floodouts, which are a floodplain style typically unique to ephemeral stream systems.…”

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confidence: 99%

Recognizing the ephemeral stream floodplain: Identification and importance of flood zones in drylands

Scamardo,

Wohl

2023

Earth Surf Processes Landf

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Previous syntheses of the hydrologic, geomorphic and biotic functions of floodplains have largely integrated research conducted along perennial stream networks, despite a growing body of literature on analogous functional floodplain zones along ephemeral streams. Although variable inundation characteristic of ephemeral streams complicates the delineation between channel and floodplain, ephemeral stream floodplains are distinct landforms that are hypothesized to host similar ecosystem functions as perennial stream floodplains, including the attenuation of downstream fluxes and provision of habitat to diverse flora and fauna. Here, we review the literature on dryland ephemeral stream floodplains in order to identify: (1) common definitions and styles; (2) unique hydrologic, geomorphic and biotic functions separate from uplands or channels; (3) current and future anthropogenic and natural stressors to such functions; and (4) knowledge gaps regarding research on ephemeral stream floodplains. Although active floodplain definitions follow criteria commonly used in perennial stream corridors, the extent of ephemeral stream floodplains is typically defined by less frequent floods. A set of floodplain styles emerges from the literature dependent on confinement and the presence of channelized streamflow. Functions related to attenuation and storage are typically concentrated in unconfined, channelled floodplains. The temporary storage of sediment and subsurface water in ephemeral stream floodplains makes them disproportionately important for biogeochemical cycling and hosts to richer, denser and more diverse vegetation communities compared with surrounding uplands. Many functions of ephemeral stream floodplains are also found in perennial counterparts, but variable flow regimes and sediment loads in ephemeral streams can potentially impact rates and magnitudes of comparable processes and functions. Future research needs to incorporate a holistic view of the ephemeral stream corridor—including channels and floodplains—to better understand current and future fluvial processes and cascading impacts in drylands globally.

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“…No entanto, no Brasil, os estudos sobre confluências estão limitados a bacia do Alto Paraná (TURRA et al 1999;BARROS, 2006;FRANCO, 2007;PAES, 2007;STEVAUX et al, 2009aSTEVAUX et al, , 2009bSANTOS, 2015;MORAIS et al, 2016) e a bacia Amazônia (SOARES, 2007;BOUCHEZ et al, 2010;FRANZINELLI, 2011;FERREIRA, 2013). Este estudo visa contribuir para preencher a lacuna referente aos estudos de confluência no Pantanal, a partir da caracterização da estrutura de fluxo da confluência dos rios Cuiabá e Paraguai objetiva-se compreender a hidrodinâmica da zona de confluência e as consequências hidrológicas para o Pantanal.…”

Section: Introductionunclassified

Hidrodinâmica da Confluência dos Rios Cuiabá e Paraguai, Pantanal Mato-grossense

et al. 2017

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Resumo: Zonas de confluência são marcadas pela forte interação de matéria e energia de canais com características distintas e se apresentam como ambiente único no contexto da bacia de drenagem. No caso do Pantanal, a incidência sazonal dos pulsos de inundação contribui para maior dinâmica entre os fluxos e até então sem estudos com esse espectro. Nesse sentido, foram executadas duas campanhas, na vazante (novembro 2015) e outra na cheia (abril de 2016), com a finalidade de caracterizar a hidrodinâmica da zona de confluência com uso da sonda Acoustic Doppler for Current Profiler. Os dados primários foram usados nas equações para caracterizar as condições hidráulicas e de geometria de canal. Observou-se que o rio Cuiabá, embora seja tributário do Paraguai, possui maior dominância no fluxo durante a vazante, bem como maior vazão e velocidade. A dinâmica entre os fluxos dos dois canais tem contribuído com a inundação perene na porção norte do Pantanal.Palavras-chave: ADCP; Pulsos de Inundação; Hidrodinâmica de Zonas de Confluência; Rios Meandrantes.Abstract: Confluence zones are marked by the strong interaction of matter and energy of channels with distinct characteristics and are presented as a unique environment in the context of the drainage basin. In the case of the Pantanal wetlands, the incidence of seasonal flood pulses contributes to the hydrodynamics of the streams and until now there is no studies with that spectrum in the area. In that sense, two campaigns were carried out to the study area, one in the drier season (November 2015) and another one in the wetter season (April 2016), with the purpose to characterize the hydrodynamics of the confluence zone using the Acoustic Doppler for Current Profiler sounder. The primary data were used in the equations to characterize the hydraulic and channel geometry conditions. It was observed the Cuiabá river, although being a tributary channel of Paraguay, has greater dominance in the flow during the drier season, as well as greater flow and velocity. The dynamics between the flows of the two channels has contributed to the perennial flood in the northern portion of the Pantanal.

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Floodplain evolution in a confluence zone: Paraná and Ivaí rivers, Brazil

Cited by 17 publications

References 42 publications

Spatial distribution patterns and predictors of fish beta‐diversity in a large dam‐free tributary from a Neotropical floodplain

Spatial distribution patterns and predictors of fish beta‐diversity in a large dam‐free tributary from a Neotropical floodplain

Recognizing the ephemeral stream floodplain: Identification and importance of flood zones in drylands

Hidrodinâmica da Confluência dos Rios Cuiabá e Paraguai, Pantanal Mato-grossense

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