A field study of the confluence between Negro and Solimões Rivers. Part 2: Bed morphology and stratigraphy

Ianniruberto, Marco; Trevethan, Mark; Pinheiro, Arthur; Andrade, Joao Fernando; Dantas, Elton Luiz; Filizola, Naziano; Santos, Andre Luis Martinelli Real dos; Gualtieri, Carlo

doi:10.1016/j.crte.2017.10.005

Cited by 60 publications

(26 citation statements)

References 40 publications

(69 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The effects of these factors have been examined with both experimentally derived junctions in laboratory (e.g., [1,3,4]), and field investigations (e.g., [5][6][7][8][9]), recently integrated with numerical modelling (e.g., [10][11][12]). In particular, with laboratory experiments, it was possible to isolate and accentuate the effect of certain parameters and processes under controlled conditions, which then were varied by using numerical simulations in order to overcome limitations of the physical models.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Junction Angle on Turbulent Flow at a Hydraulic Confluence

Penna

Marchis

Canelas

et al. 2018

Water

View full text Add to dashboard Cite

Despite the existing knowledge concerning the hydrodynamic processes at river junctions, there is still a lack of information regarding the particular case of low width and discharge ratios, which are the typical conditions of mountain river confluences. Aiming at filling this gap, laboratory and numerical experiments were conducted, comparing the results with literature findings. Ten different confluences from 45 • to 90 • were simulated to study the effects of the junction angle on the flow structure, using a numerical code that solves the 3D Reynolds Averaged Navier-Stokes (RANS) equations with the k-turbulence closure model. The results showed that the higher the junction angle, the wider and longer the retardation zone at the upstream junction corner and the separation zone, and the greater the flow deflection at the entrance of the tributary into the post-confluence channel. Furthermore, it was shown that the maximum streamwise velocity does not necessarily increase with the junction angle and that it is not always located in the contraction section.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of the Junction Angle on Turbulent Flow at a Hydraulic Confluence

Penna

Marchis

Canelas

et al. 2018

Water

View full text Add to dashboard Cite

show abstract

“…Furthermore, the change point of the channel gradient is located farther upstream than the boundary between land and sea in the Holocene glacial retreat, which is because of sediment transport from upstream of the Sato River, like the KR. The longitudinal river profile is influenced strongly by tributary confluence, neo-tectonics, or active faults [76][77][78][79]. The change of the longitudinal gradient in the lowland area of the KR basin seems to be due to the sea level change in the Holocene glacial treat.…”

Section: Topographical Formation Process Of Lowland Area In Kr Basinmentioning

confidence: 99%

Influence of Microtopography and Alluvial Lowland Characteristics on Location and Development of Residential Areas in the Kuji River Basin of Japan

2019

View full text Add to dashboard Cite

Adopting a comprehensive, basin-wide method for preventing flood disasters would be effective to deflect the climate-change-induced intensified water-related disasters. This study considers the land use and settlement patterns based on microtopography and flood risks. The influence of the microtopography and alluvial lowland characteristics on the location and development of residential areas in the Kuji River basin, Japan, is a fundamental aspect of historical knowledge. Investigating the relation between the microtopography and the location of antiquities shows that most of the relics dating to or before the third century were situated in the terraces near the lowlands. The development of lowlands near the mainstream of the Kuji River began around the third century. Furthermore, the relation between the microtopography and development of residential areas is investigated using building density as the development indicator. The results confirm the increase in building density in the alluvial surface, proving a history of flood damage and delayed development compared to other regions. This investigation reveals land development in areas, including the former river bed on the mouth of the Kuji River and the flood plain on the margins of the Hitachiota urban distinct, with no confirmed inhabitation before modern times because of elevated flooding risk.

show abstract

“…River confluences are nodes in fluvial systems where the combining flows converge and realign further downstream, generating complex hydraulic processes within a region called confluence hydrodynamic zone (CHZ). It is known that confluence geometry, the momentum flux ratio between the merging rivers, the level of concordance of riverbeds at confluence entrance, as well as density differences could cause significant vertical, lateral, and streamwise gradients in velocity forming several distinct hydrodynamic zones [1][2][3][4][5]. Confluences also have important ecological and morphological functions, related to water chemistry, riverine ecology, in-stream, and riparian vegetation [6], physical habitat, as well as biological activity (fish spawning, feeding, etc.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Hyporheic Exchange Drivers and Patterns within a Low-Gradient, First-Order, River Confluence during Low and High Flow

Martone

Gualtieri

Endreny

2020

Water

Self Cite

View full text Add to dashboard Cite

Confluences are nodes in riverine networks characterized by complex three-dimensional changes in flow hydrodynamics and riverbed morphology, and are valued for important ecological functions. This physical complexity is often investigated within the water column or riverbed, while few studies have focused on hyporheic fluxes, which is the mixing of surface water and groundwater across the riverbed. This study aims to understand how hyporheic flux across the riverbed is organized by confluence physical drivers. Field investigations were carried out at a low gradient, headwater confluence between Baltimore Brook and Cold Brook in Marcellus, New York, USA. The study measured channel bathymetry, hydraulic permeability, and vertical temperature profiles, as indicators of the hyporheic exchange due to temperature gradients. Confluence geometry, hydrodynamics, and morphodynamics were found to significantly affect hyporheic exchange rate and patterns. Local scale bed morphology, such as the confluence scour hole and minor topographic irregularities, influenced the distribution of bed pressure head and the related patterns of downwelling/upwelling. Furthermore, classical back-to-back bend planform and the related secondary circulation probably affected hyporheic exchange patterns around the confluence shear layer. Finally, even variations in the hydrological conditions played a role on hyporheic fluxes modifying confluence planform, and, in turn, flow circulation patterns.

show abstract

A field study of the confluence between Negro and Solimões Rivers. Part 2: Bed morphology and stratigraphy

Cited by 60 publications

References 40 publications

Effect of the Junction Angle on Turbulent Flow at a Hydraulic Confluence

Effect of the Junction Angle on Turbulent Flow at a Hydraulic Confluence

Influence of Microtopography and Alluvial Lowland Characteristics on Location and Development of Residential Areas in the Kuji River Basin of Japan

Characterization of Hyporheic Exchange Drivers and Patterns within a Low-Gradient, First-Order, River Confluence during Low and High Flow

Contact Info

Product

Resources

About