Uso de traçadores fluorescentes para determinar características de transporte e dispersão no Rio Piabanha (RJ) para a modelagem quali-quantitativa pelo HEC-RAS

Silva, Paulo Vitor Ribeiro Marques da; Pecly, J.; Azevedo, José Paulo Soares de

doi:10.1590/s1413-41522017150187

Cited by 6 publications

(7 citation statements)

References 7 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The GMD (Good Mixing Distance) was determined by means of field experiments, which consisted of collecting samples simultaneously in different verticals in the monitoring sections and comparing the crossing curves of the tracers in each of the verticals. This procedure is recommended by Silva et al (2017). With the analysis of the results of this procedure it was possible to define the concentration of the tracer solution, the total measurement time and the measurement interval of the electrical conductivity.…”

Section: Test Testing Campaignmentioning

confidence: 99%

See 1 more Smart Citation

Experimental determination of the time of concentration, Sapucajuba creek small watershed study

Penner

Matos

Almeida

et al. 2021

RSD

View full text Add to dashboard Cite

Time of concentration (tc) is a parameter that indicates the response time of a river catchment to a rainfall. Frequently, empirical equations are used to determination of tc for the design of the maximum flow. However, the determination of this response time by equations sometimes results in an erroneous application, that is, outside its field of validity. Thus, the present work aimed to determine tc in an experimental and simplified way in the Sapucajuba creek, from measurements in the field, with saline tracer, and to make a comparison with 13 empirical models, which require the morphometric characteristics of the small watershed. It was observed that they underestimated the time of concentration value, in general, by empirical models, overestimating the future project flow. DNOS (sandy-clay condition, intense vegetation, high absorption) was the most indicated model for the estimate of tc, that provided the lowest percentage error, 1.92%, compared to tc measured in the field. However, such error exceeded 70.00% by other models, showing great variability. Therefore, it is strongly recommended the determination of tc in field, that will provide a real result, contributing to the economic dimensioning of hydraulic-hydrological works and projects.

show abstract

Section: Test Testing Campaignmentioning

confidence: 99%

“…It should be noted that this stage was of paramount importance to be able to have sensitivity in relation to the field analysis, and should pay attention to the necessary adjustments, thus avoiding unreal results, as recommended by Silva, et al (2017).…”

Section: Test Trialsmentioning

confidence: 99%

Experimental determination of the time of concentration, Sapucajuba creek small watershed study

Penner

Matos

Almeida

et al. 2021

RSD

View full text Add to dashboard Cite

show abstract

“…A vazão é um parâmetro hidráulico que pode ser determinado pelo uso de traçadores em experimento de campo, mas para isso é necessário a mistura completa do traçador com o corpo hídrico, pois caso essa condição não seja atendida, torna-se imprópria para a estimativa da mesma (Silva, Pecly, & Azevedo, 2017).…”

Section: Monitoramento Da Vazão Mensalunclassified

Adaptação da metodologia de Thornthwaite E Mather para balanço hídrico em uma microbacia hidrográfica

Gonçalves

Penner

Martins

2020

RSD

View full text Add to dashboard Cite

A sustentabilidade ambiental da microbacia hidrográfica do igarapé Uriboquinha, com a presença de um aterro sanitário nos seus domínios, passa pela quantificação hidrológica e diversos controles ambientais. A apresente pesquisa focou na geração de dados hidrológicos com uma nova abordagem do balanço hídrico climatológico por uma adaptação da metodologia de Thornthwaite e Mather. Originalmente a metodologia desenvolve o balanço hídrico indireto, partindo apenas da precipitação e da evapotranspiração como variáveis hidrológicas. Todavia entendendo-se que a vazão é uma variável hidrológica fundamental introduziu-se a mesma como uma das grandezas hídricas envolvidas no balanço. Para tanto, monitorou-se a vazão pelo período de um ano (mai/18 a abr/19) hidrológico com a metodologia do traçador salino. Com o desenvolvimento do balanço hídrico constatou-se que houveram períodos frequentes de excedência hídrica (mai/18, ago/18, set/18 e dez/18 a abr/19) e reduzido período de deficiência hídrica (jun/18, jul/18 e out/18). O método proposto evidenciou a contribuição de cada variável no balanço hídrico onde o incremento da vazão representa diretamente a saída de água na bacia por meio do escoamento de base e escoamento superficial direto. O balanço hídrico resultante indicou condições locais condizentes com a realidade, com predomínio de elevados índices pluviométricos, mostrando-se como metodologia que pode ser utilizada para estudos envolvendo a temática de atividades poluidoras e seus respectivos monitoramentos ambientais.

show abstract

“…The Piabanha basin contains growing, unregulated domestic settlements, industries with high pollution potential, and agricultural activities (Cesar et al 2011, Villas-Boas et al 2017. The river has a mean annual discharge of 40 m 3 /s, oscillating between 80 m 3 /s (wet period) and 15 m 3 /s (dry period) (Silveira et al 2016), which may vary widely along its course, with lower mean discharge in the upper stretch (Da Silva et al 2017). For phytoplankton, Graco-Roza et al (2020), based on monthly sampling for one year in different stretches of the river, found a relationship between phytoplankton variation and environmental heterogeneity, highlighting the importance of river dynamics in shaping phytoplankton communities, with a smaller effect during the rainy period.…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Dynamics of Phytoplankton in a Highly Impacted Tropical Montane River

Barreto¹,

Furtado²,

Folharini³

et al. 2022

Oecol. Austr.

Self Cite

View full text Add to dashboard Cite

Rivers, as most bodies of water, are subject to eutrophication and water contamination, mainly from domestic sewage and industrial discharges from urban centers and agricultural areas. These growing human impacts result in a gradual loss of water quality and changes in biotic communities, including phytoplankton. Analyzing the dynamics of phytoplankton is important to understand how, in addition to hydrography and the physical, chemical and biological variables, human impact can be a controlling factor in this dynamic. In this study, we analyzed abiotic variables and zooplankton abundance to identify the factors controlling different phytoplankton attributes at six sampling points, in two climatic periods and three years, in the Piabanha River, a slowly flowing stream with to strong human impact beginning in its upper course, in a mountain region in southeastern Brazil. The results showed homogeneous environmental variables and different phytoplankton attributes along most of the stretch analyzed, except for sampling point 1, located in a preserved forest area but with nutrient concentrations limiting phytoplankton growth. The difference in flow between the two climatic periods (dry and wet) was not sufficient to change the total phytoplankton biovolume. Temperature seemed to strongly affect the phytoplankton response, with larger relative contributions from cyanobacteria in the wet period, with higher temperatures, and from phytoflagellates in the dry period, with lower temperatures. As expected, zooplankton showed no influence on phytoplankton dynamics, with a large contribution from small rotifers. In this tropical montane river, with slow flow and intense human impacts, nutrient concentrations and temperature were the main drivers of the spatial and temporal dynamics of phytoplankton, respectively

show abstract

Uso de traçadores fluorescentes para determinar características de transporte e dispersão no Rio Piabanha (RJ) para a modelagem quali-quantitativa pelo HEC-RAS

Abstract: Keywords: fluorescent tracers in hydrology; transport and dispersion of pollutants; hydrodynamic and transport modeling.

Cited by 6 publications

References 7 publications

Experimental determination of the time of concentration, Sapucajuba creek small watershed study

Experimental determination of the time of concentration, Sapucajuba creek small watershed study

Adaptação da metodologia de Thornthwaite E Mather para balanço hídrico em uma microbacia hidrográfica

Spatial and Temporal Dynamics of Phytoplankton in a Highly Impacted Tropical Montane River

Contact Info

Product

Resources

About