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Article ; Online: Hydrogeomorphology of Asymmetric Meandering Channels: Experiments and Field Evidence

Abad, J. D. / Motta, D. / Guerrero, L. / Paredes, M. / Kuroiwa, J. M. / Garcia, M. H.

Water Resources Research. 2023 July, v. 59, no. 7 p.e2022WR033904-

2023

Abstract: Meandering channels display complex planform configurations with upstream (US)‐ and downstream (DS)‐skewed bends. Bend orientation is linked to hydrodynamics, bed morphodynamic regime, bank characteristics, riparian vegetation, and geological environment, ...

Abstract	Meandering channels display complex planform configurations with upstream (US)‐ and downstream (DS)‐skewed bends. Bend orientation is linked to hydrodynamics, bed morphodynamic regime, bank characteristics, riparian vegetation, and geological environment, which are the modulating factors that act specially in high‐amplitude and high‐sinuosity conditions. Based on the interaction between hydrodynamics and morphodynamics, previous studies have suggested that sub‐ (β < βR) and super‐resonant (β > βR) morphodynamic regimes (where β is the half width‐to‐depth ratio of the channel, and βR is the resonance condition) may trigger a particular bend orientation (upstream‐ and downstream‐skewed, respectively). However, natural rivers exhibit both US‐skewed and DS‐skewed bend patterns along the same reach, independently of the morphodynamic regime. Little is known about the hydrogeomorphology (forced and free morphodynamic patterns) under these bend orientations. Herein, using the asymmetric Kinoshita laboratory channel, experiments under sub‐ and super‐resonant conditions (with presence or absence of free bars) for upstream‐and downstream‐skewed conditions are performed. The experiments with migrating bars (β = 10, 15) are compared with previous experiments where only migrating dunes (β = 2) under sub‐resonant condition were observed. Additional, detailed field measurements at US‐ and DS‐skewed bends of different skewness along the Tigre River in Peru are also presented. Conditions at field scale filter out the influence of the morphodynamic regime in high‐sinuosity and high amplitude bends, where nonlinear processes (width variation, bedform dynamics) can directly affect the development of the three‐dimensional flow structure, and consequently the erosional and depositional patterns, and the lateral migration patterns.
Keywords	hydrodynamics ; research ; riparian vegetation ; rivers ; statistical analysis ; water ; Peru
Language	English
Dates of publication	2023-07
Publishing place	John Wiley & Sons, Ltd
Document type	Article ; Online
Note	JOURNAL ARTICLE
ZDB-ID	5564-5
ISSN	1944-7973 ; 0043-1397
ISSN (online)	1944-7973
ISSN	0043-1397
DOI	10.1029/2022WR033904
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Leptodelphax maculigera (Hemiptera: Delphacidae): first occurrence in Southern Brazil and potential rayadofino vector.

Bortolotto, O C / Molina, R O / Garcia, M H / Pazini, J B / Andrade, C C L / Mituti, T

Brazilian journal of biology = Revista brasleira de biologia

2023 Volume 83, Page(s) e277457

MeSH term(s)	Animals ; Hemiptera ; Brazil
Language	English
Publishing date	2023-11-10
Publishing country	Brazil
Document type	Journal Article
ZDB-ID	2036257-2
ISSN	1678-4375 ; 1519-6984
ISSN (online)	1678-4375
ISSN	1519-6984
DOI	10.1590/1519-6984.277457
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Article ; Online: Off-White Perifollicular Halo Around the Salt and Pepper Sign in the Dermoscopic Diagnosis of Systemic Sclerosis and Interstitial Lung Disease.

Hernández Collazo, A A / Capilla García, M H / Barba Hernández, F / Quiñones Venegas, R

Actas dermo-sifiliograficas

2021 Volume 113, Issue 10, Page(s) 970–972

Title translation	Halo perifolicular blanquecino a la dermatoscopia del signo de sal y pimienta en el diagnóstico de esclerosis sistémica y enfermedad pulmonar intersticial.
MeSH term(s)	Humans ; Lung Diseases, Interstitial/diagnostic imaging ; Lung Diseases, Interstitial/etiology ; Scleroderma, Systemic/complications
Language	Spanish
Publishing date	2021-11-10
Publishing country	Spain
Document type	Case Reports
ZDB-ID	390255-9
ISSN	1578-2190 ; 0001-7310 ; 1138-8196
ISSN (online)	1578-2190
ISSN	0001-7310 ; 1138-8196
DOI	10.1016/j.ad.2021.07.011
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Book ; Online: Effect of self-stratification on sediment diffusivity in channel flows and boundary layers

Dutta, S. / Cantero, M. I. / Garcia, M. H.

eISSN: 2196-632X

a study using direct numerical simulations

2018

Abstract: Sediment transport in nature comprises of bedload and suspended load, and precise modelling of these processes is essential for accurate sediment flux estimation. Traditionally, non-cohesive suspended sediment has been modelled using the advection– ... ...

Abstract	Sediment transport in nature comprises of bedload and suspended load, and precise modelling of these processes is essential for accurate sediment flux estimation. Traditionally, non-cohesive suspended sediment has been modelled using the advection–diffusion equation (Garcia, 2008), where the success of the model is largely dependent on accurate approximation of the sediment diffusion coefficients. The current study explores the effect of self-stratification on sediment diffusivity using suspended sediment concentration data from direct numerical simulations (DNS) of flows subjected to different levels of stratification, where the level of stratification is dependent on the particle size (parameterized using particle fall velocity Ṽ and volume-averaged sediment concentration (parameterized using shear Richardson number Ri τ . Two distinct configurations were explored, first the channel flow configuration (similar to flow in a pipe or a duct) and second, a boundary-layer configuration (similar to open-channel flow). Self-stratification was found to modulate the turbulence intensity (Cantero et al., 2009b), which in turn was found to reduce vertical sediment diffusivity in portions of the domain exposed to turbulence damping. The effect of particle size on vertical sediment diffusivity has been studied in the past by several authors (Rouse, 1937; Coleman, 1970; Nielsen and Teakle, 2004); so in addition to the effect of particle size, the current study also explores the effect of sediment concentration on vertical sediment diffusivity. The results from the DNS simulations were compared with experiments (Ismail, 1952; Coleman, 1986) and field measurements (Coleman, 1970), and were found to agree qualitatively, especially for the case of channel flows. The aim of the study is to understand the effect of stratification due to suspended sediment on vertical sediment diffusivity for different flow configurations, in order to gain insight of the underlying physics, which will eventually help us to improve the existing models for sediment diffusivity.
Subject code	551
Language	English
Publishing date	2018-09-27
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Innovative framework to simulate the fate and transport of nonconservative constituents in urban combined sewer catchments

Morales, V. M. / Quijano, J. C. / Schmidt, A. / Garcia, M. H.

Water Resources Research. 2016 Nov., v. 52, no. 11 p.9164-9181

2016

Abstract: We have developed a probabilistic model to simulate the fate and transport of nonconservative constituents in urban watersheds. The approach implemented here extends previous studies that rely on the geomorphological instantaneous unit hydrograph concept ...

Abstract	We have developed a probabilistic model to simulate the fate and transport of nonconservative constituents in urban watersheds. The approach implemented here extends previous studies that rely on the geomorphological instantaneous unit hydrograph concept to include nonconservative constituents. This is implemented with a factor χ that affects the transfer functions and therefore accounts for the loss (gain) of mass associated with the constituent as it travels through the watershed. Using this framework, we developed an analytical solution for the dynamics of dissolved oxygen (DO) and biochemical oxygen demand (BOD) in urban networks based on the Streeter and Phelps model. This model breaks down the catchment into a discreet number of possible flow paths through the system, requiring less data and implementation effort than well‐established deterministic models. Application of the model to one sewer catchment in the Chicago area with available BOD information proved its ability to predict the BOD concentration observed in the measurements. In addition, comparison of the model with a calibrated Storm Water Management Model (SWMM) of another sewer catchment from the Chicago area showed that the model predicted the BOD concentration as well as the widely accepted SWMM. The developed model proved to be a suitable alternative to simulate the fate and transport of constituents in urban catchments with limited and uncertain input data.
Keywords	biochemical oxygen demand ; dissolved oxygen ; geomorphology ; hydrograph ; probabilistic models ; research ; simulation models ; stormwater management ; water ; watersheds ; Illinois
Language	English
Dates of publication	2016-11
Size	p. 9164-9181.
Publishing place	John Wiley & Sons, Ltd
Document type	Article ; Online
Note	JOURNAL ARTICLE
ZDB-ID	5564-5
ISSN	1944-7973 ; 0043-1397
ISSN (online)	1944-7973
ISSN	0043-1397
DOI	10.1002/2016WR018807
Database	NAL-Catalogue (AGRICOLA)

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Article: Innovative framework to simulate the fate and transport of nonconservative constituents in urban combined sewer catchments

Morales, V. M. / Quijano, J. C. / Schmidt, A. / Garcia, M. H.

Water resources research

2016 Volume 52, Issue 11, Page(s) 9164

Language	English
Document type	Article
ZDB-ID	5564-5
ISSN	0043-1397
DOI	10.1002/2016WR018807
Database	Current Contents Nutrition, Environment, Agriculture

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Article: Modification of meander migration by bank failures

Motta, D / Langendoen, E. J / Abad, J. D / Garcia, M. H

Journal of geophysical research : Earth surface. 2014 May 9, v. 119, no. 5

2014

Abstract: Meander migration and planform evolution depend on the resistance to erosion of the floodplain soils. To date, research to quantify meandering river adjustment has largely focused on resistance to erosion properties that vary horizontally. This paper ... ...

Abstract	Meander migration and planform evolution depend on the resistance to erosion of the floodplain soils. To date, research to quantify meandering river adjustment has largely focused on resistance to erosion properties that vary horizontally. This paper evaluates the combined effect of horizontal and vertical floodplain soil heterogeneity on meander migration by simulating fluvial erosion and cantilever and planar bank mass failure processes responsible for bank retreat. The impact of streambank failures on meander migration is conceptualized through a bank armoring factor associated with the dynamics of slump blocks produced by cantilever and planar failures. Simulation periods smaller than the time to cutoff are considered, such that all planform complexity is caused by bank erosion processes and floodplain heterogeneity and not by cutoff dynamics. Cantilever failure continuously affects meander migration, because it is primarily controlled by the fluvial erosion at the bank toe. Hence, it impacts migration rates and meander shapes through the horizontal and vertical distribution of soil erodibility. Planar failures are more episodic. However, in floodplain areas characterized by less cohesive soils, it can affect meander evolution in a sustained way and produce preferential migration patterns. Model results show that besides the hydrodynamics, bed morphology and horizontal floodplain heterogeneity, the stratigraphy of the floodplain soils can significantly affect meander evolution, both in terms of migration rates and planform shapes. Specifically, downstream meander migration can either increase or decrease with respect to the case of homogeneous floodplain soil; lateral migration generally decreases as result of bank protection due to slump blocks; and the effect on bend skewness depends on the location and volumes of failed bank material caused by cantilever and planar failures along the bends, with possible achievement of downstream bend skewness under certain conditions. Therefore, soil stratigraphy must be accounted for when estimating meander migration within floodplains.
Keywords	alluvial soils ; bank erosion ; erodibility ; floodplains ; hydrodynamics ; rivers ; soil heterogeneity ; stratigraphy ; stream channels ; stream flow
Language	English
Dates of publication	2014-0509
Size	p. 1026-1042.
Publishing place	Wiley
Document type	Article
ZDB-ID	2138320-0
ISSN	2156-2202 ; 2169-9011 ; 0148-0227 ; 2169-9003
ISSN (online)	2156-2202 ; 2169-9011
ISSN	0148-0227 ; 2169-9003
DOI	10.1002/2013JF002952
Database	NAL-Catalogue (AGRICOLA)

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Article: The effects of floodplain soil heterogeneity on meander planform shape

Motta, D / Abad, J. D / Langendoen, Eddy J / García, M. H

Water Resources Research. 2012 Sept., v. 48, no. 9

2012

Abstract: Meander migration rates and patterns are a function of the forces exerted by the flowing water on the streambanks and the resistance to erosion of the bank soils. Past analytical studies of planform development have mostly focused on the complexity of ... ...

Abstract	Meander migration rates and patterns are a function of the forces exerted by the flowing water on the streambanks and the resistance to erosion of the bank soils. Past analytical studies of planform development have mostly focused on the complexity of the governing equations, i.e. hydrodynamics, and less so on the resistance of the stream banks. Meander migration results in highly heterogeneous distributions of floodplain soils, which are difficult to describe deterministically. This motivated the use of a Monte Carlo approach to examine the effects of floodplain soils and their distribution on planform development. Meander migration was computed using the classic Ikeda et al. [1981]’s model for hydrodynamics and bed morphodynamics, but coupled, instead of a simple bank migration coefficient, with a physically-based bank erosion model. Simulated bank erosion rates are controlled by the resistance to hydraulic erosion of the bank soils, which is represented by the critical shear stress and erodibility coefficient parameters in an excess shear stress relation. The spatial distribution of critical shear stress across the floodplain is delineated on a rectangular, equidistant grid with varying degree of variability to mimic natural settings. The corresponding erodibility coefficient is computed using a relation derived from in situ measurements of critical shear stress and erodibility. Two spatial distributions were considered for the resistance to erosion properties: (1) a purely random (PR) distribution, and (2) a randomly-disturbed (RD) distribution in which the mean resistance to erosion exponentially increased away from the valley centerline. For the RD distribution two relevant parameters are identified. First, the standard deviation of the critical shear stress distribution, which is an indicator of the local soil heterogeneity, controls skewness and variability of the channel centerline. It can produce downstream-skewed bends and complex planform features, while not significantly affecting lateral migration. Second, the cross-valley increase in soil resistance primarily constrains rates of lateral migration though bend skewness is also affected. For the PR distribution, the simulated migration of channel centerline exhibited larger variability for increasing spatial scales of the floodplain-soil heterogeneity, though their relation appeared to be less than linear. Finally, relating meander migration to hydraulic erosion of the bank soils produced more variability and shape complexity than the “classic” approach relating migration rate to excess velocity at the outer bank for equal stochastic variability of the corresponding governing parameters. This is most likely caused by the absence of a threshold for bank erosion in the classic Ikeda et al. [1981]’s approach.
Keywords	Monte Carlo method ; alluvial soils ; bank erosion ; equations ; erodibility ; floodplains ; hydrodynamics ; hydrologic models ; probability distribution ; shear stress ; soil heterogeneity
Language	English
Dates of publication	2012-09
Size	p. 1-17.
Publishing place	American Geophysical Union
Document type	Article
ZDB-ID	5564-5
ISSN	0043-1397
ISSN	0043-1397
DOI	10.1029/2011WR011601
Database	NAL-Catalogue (AGRICOLA)

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Article: The effects of floodplain soil heterogeneity on meander planform shape

Motta, D. / Abad, J. D. / Langendoen, E. J. / García, M. H.

Water resources research

2012 Volume 48, Issue 9, Page(s) W09518

Language	English
Document type	Article
ZDB-ID	5564-5
ISSN	0043-1397
DOI	10.1029/2011WR011601
Database	Current Contents Nutrition, Environment, Agriculture

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Article: Utilização de recurso tecnológico como agente facilitador do trabalho de enfermagem.

Bellini, C / Garcia, M H / Palucci Marziale, M H

Revista latino-americana de enfermagem

1996 Volume 4, Issue 2, Page(s) 101–111

Abstract: Nowadays technological resources are being employed to facilitate several work activities. This includes patient's elevator which is essential for their moving and transportation without causing excessive physical stress for the nursing group. The ... ...

Title translation	Use of technological resources in order to facilitate the nurses' work.
Abstract	Nowadays technological resources are being employed to facilitate several work activities. This includes patient's elevator which is essential for their moving and transportation without causing excessive physical stress for the nursing group. The objectives of this study were to investigate the reason for the lack of use of this type of resource which is available in neurological clinics and to elaborate guidelines for orientation and training. The results showed us that the cause for non utilization of this resource was the lack of training of the nursing team. The guidelines for teaching and training are presented.
MeSH term(s)	Ergonomics ; Guidelines as Topic ; Health Knowledge, Attitudes, Practice ; Humans ; Lifting ; Nursing Care/methods ; Nursing Staff, Hospital/education ; Nursing Staff, Hospital/psychology ; Occupational Health
Language	Portuguese
Publishing date	1996-07
Publishing country	Brazil
Document type	Journal Article
ZDB-ID	2105698-5
ISSN	1518-8345 ; 0104-1169
ISSN (online)	1518-8345
ISSN	0104-1169
DOI	10.1590/s0104-11691996000200008
Database	MEDical Literature Analysis and Retrieval System OnLINE

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