Circulation and transport processes in a tidally forced salt-wedge estuary: The São Francisco river estuary, Northeast Brazil

2020 ◽  
pp. 101602
Author(s):  
Bárbara P. Paiva ◽  
Carlos A.F. Schettini
Keyword(s):  
River Estuary ◽  
Transport Processes ◽  
Northeast Brazil ◽  
Salt Wedge ◽  
Sao Francisco River ◽  
São Francisco River

scholarly journals Sediment input from the São Francisco River bank, Northeast Brazil, under low discharge period

2021 ◽  
Author(s):  
Francisco Sandro Rodrigues Holanda ◽  
Maria Hosana dos Santos ◽  
Janisson Batista de Jesus ◽  
Wadson De Menezes Santos ◽  
Edinaldo De Oliveira Alves Sena ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
River Discharge ◽  
River Channel ◽  
Sediment Supply ◽  
Northeast Brazil ◽  
Sao Francisco River ◽  
Soil Bioengineering ◽  
São Francisco River ◽  
Sediment Input ◽  
Bioengineering Techniques

The objective of this study was to evaluate the input of suspended sediment from the slope toe in the São Francisco River channel, in Northeast Brazil, under different soil bioengineering techniques. Sediments were collected in the years of 2013, 2014 and 2015, in five transects crossing the river channel. Sediment input in the sampling points was higher in the year of 2013, i.e., the year of the highest river discharge. Sediment supply to the river channel for a period of 3 years (2013, 2014 and 2015), was evaluated at 20, 40 and 60% depth, along five different transects (P1= riverbank, P2= beginning of the thalweg, P3= middle of the thalweg, P4= end of the thalweg, and P5 = margin of the side sandybar), oriented by the presence or absence of erosion control techniques (treatments) such as: 1-Natural Vegetated Slope; 2-Vegetated Riprap; 3-Eroded Slope; 4-Live Cribwall and 5-Vetiver grass Contour Line. Sediments input was different in all evaluated transects, and the one identified as Eroded Slope at 20% depth presented the lowest amount of suspended sediment load. There was a decrease in the total amount of suspended sediment in the evaluated periods, probably due to the progressive decrease in the river discharge, and the protection provided by the soil bioengineering techniques.

O RECIFE E O CENTENáRIO DE DELMIRO GOUVEIA EM PERNAMBUCO (1963)

2013 ◽  
Vol 10 (16) ◽  
Author(s):  
DILTON Cá‚NDIDO SANTOS MAYNARD
Keyword(s):  
Foreign Capital ◽  
Social Research ◽  
Northeast Brazil ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Hydropower Potential ◽  
National Hero ◽  
Brazilian History ◽  
The City

Resumo: O artigo analisa as comemorações do centenário de Delmiro Gouveia, ocorridas em 1963. Considerado um mártir na luta contra brasileira o capital estrangeiro, o empreendedor pioneiro no aproveitamento do potencial hidrelétrico do rio São Francisco e o modernizador dos sertões alagoanos, Delmiro foi retomado como um á­cone nacionalista num contexto em que se discutiam os rumos para o desenvolvimento do Nordeste. As comemorações do seu centenário de nascimento, ocorridas em Pernambuco, envolveram esforços para atribuir ao ”coronel dos coronéis” o epá­teto de pioneiro na redenção regional. As diversas atividades constituintes destas celebrações revelam um embate não só pela confecção da memória do homenageado, bem como uma tensão entre transformá-lo em um herói nacional e utilizar a sua biografia para acentuar as particularidades do povo nordestino. Neste texto, o alvo das atenções é a ”Semana Delmiro Gouveia” (SDG), organizada pelo Instituto Joaquim Nabuco de Pesquisas Sociais (IJNPS), localizado no Recife, Pernambuco. Ali estiveram reunidos alguns dos principais estudiosos de Gouveia que, sob a coordenação de Gilberto Freyre e Mauro Mota, apresentaram as suas interpretações sobre a vida e a obra do ”Coronel dos Coronéis”. Palavras-chave: Delmiro Gouveia, Comemoração, Nordeste Brasileiro.  THE CITY OF RECIFE AND THE DELMIRO GOUVEIA CENTENARY IN PERNAMBUCO (1963)Abstract: This article analyzes the centenary celebrations of Delmiro Gouveia, occurred in 1963. Considered a martyr in the fight against Brazilian foreign capital, the pioneering entrepreneur in harnessing the hydropower potential of São Francisco River and the modernizing of Alagoas backwoods, Delmiro was included as a nationalist icon in a context in which they discussed the directions for the Northeast development. The celebrations of his centenary birth, occurred in Pernambuco, had involved efforts to give him the epithet pioneer in regional redemption. The various constituent activities of these celebrations reveal a clash not only by creation of the honoree's memory as well as a tension between turn it into a national hero and use his biography to emphasize the particularities of the northeastern people. This paper is mostly about the "Delmiro's Gouveia Week", organized by the Institute for Social Research Joaquim Nabuco, located in Recife, State of Pernambuco. In this place gathered some of the leading scholars of Gouveia, who, under the coordination of Gilberto Freyre and Mauro Mota, presented their interpretations of the life and work of biggest colonel in Brazilian history. Keywords: Delmiro Gouveia , Celebration, Northeast Brazil.  

scholarly journals Sporolithon franciscanum sp. nov. (Sporolithales, Rhodophyta), a New Rhodolith-Forming Species from Northeast Brazil

Diversity ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 199 ◽  
Author(s):  
Luis Alfredo S. Leão ◽  
Ricardo G. Bahia ◽  
Michel B. Jesionek ◽  
Walter H. Adey ◽  
Gabriel Johnson ◽  
...  
Keyword(s):  
New Species ◽  
Dna Sequences ◽  
Drainage Basin ◽  
River Mouth ◽  
Coralline Algae ◽  
Northeast Brazil ◽  
Anatomical Features ◽  
Sao Francisco River ◽  
São Francisco River ◽  
The World

This paper describes Sporolithon franciscanum, a new rhodolith-forming species of non-geniculate coralline algae found at depths between 47–52 m near the São Francisco river mouth, the second largest and the most extensive drainage basin in Brazil, and also at the Abrolhos Bank, in the world´s largest rhodolith beds. DNA sequences from plastidial psbA and rbcL markers indicate that the species is unique compared to all other Sporolithon species that have thus far been sequenced. Since morpho-anatomical features of the new species are shared with some other Sporolithon species, its identification was only confirmed by DNA sequences.

scholarly journals INSIGHTS ON THE INFLUENCE OF PHYLOGENETIC ON THE RELATIVE GROWTH USING Atherinella brasiliensis AS A TOOL

2021 ◽  
Vol 47 ◽  
pp. e640
Author(s):  
Renato Luiz BOT NETO ◽  
Barbara Maichak de CARVALHO ◽  
Roberto SCHWARZ JÚNIOR ◽  
Henry Louis SPACH
Keyword(s):  
Frequency Distribution ◽  
Environmental Influence ◽  
River Estuary ◽  
Weight Ratio ◽  
Brazilian Coast ◽  
Constant Input ◽  
Growth Coefficient ◽  
Relative Growth ◽  
Sao Francisco River ◽  
São Francisco River

The length–weight relationships (LWR) are important tools for ichthyology, they are useful to demonstrate the environmental influence on growth. In this study we estimate the LWR of the Atherinella brasiliensis in the shallow areas of the São Francisco river estuary and compare the growth of this specie in different environments of the Brazilian coast. Specimens of Brazilian silverside (A. brasiliensis, n = 3483), between 2.1 and 13.6 cm in length, were caught in the shallow areas of the São Francisco River estuary between May 2017 and April 2018. The length-weight ratio of the species was represented by the equation y=0.0047x3.0913. Frequency distribution indicates that the species is present in the shallow areas of the São Francisco River estuary in all its ontogenetic stages and apparently reproduces throughout the year with constant input of recruits into the population. Von Bertalanffy’s growth model and longevity were adjusted to reach asymptotic length (L∞) of 14.7 cm, growth coefficient (K) of 0.91 year-1 and longevity (A95) of 3.25 years. The analysis of variance revealed differences for the maximum total length. However, the differences found between the present study and data available in the literature appear to be caused by environmental and methodological differences.

scholarly journals Mangrove Soil in Physiographic Zones in the Sao Francisco River Estuary

2018 ◽  
Vol 25 (2) ◽  
Author(s):  
Karen Viviane Santana de Andrade ◽  
Francisco Sandro Rodrigues Holanda ◽  
Tiago de Oliveira Santos ◽  
Mykael Bezerra Santos Santana ◽  
Renisson Neponuceno de Araújo Filho
Keyword(s):  
River Estuary ◽  
Sao Francisco River ◽  
Mangrove Soil ◽  
São Francisco River

scholarly journals Circulation and salt balance in the São Francisco river Estuary (NE/Brazil)

RBRH ◽  
2017 ◽  
Vol 22 (0) ◽  
Author(s):  
Geórgenes Cavalcante ◽  
Luiz Bruner de Miranda ◽  
Paulo Ricardo Petter Medeiros
Keyword(s):  
River Discharge ◽  
Neap Tide ◽  
Spring Tide ◽  
River Estuary ◽  
Salt Transport ◽  
Salt Flux ◽  
Sao Francisco River ◽  
Tidal Cycles ◽  
São Francisco River ◽  
And Diffusion

ABSTRACT In order to evaluate how river discharge and tidal currents forcing influence the circulation and salt transport within the São Francisco River-Estuary, a two 25 hour surveys campaigns and along-channel profiles were performed in the estuary main channel (18/19 and 25/26 February 2014). The current intensity showed higher asymmetry between flood (v<0) and ebb (v>0) currents in spring tide (-0.6 and 1.1 m/s), as compared to neap tide (-0.4 and 1.0 m/s), which was attributed to the intense buoyancy energy enhanced by the stronger discharge in spring. Overall, salinity presented high stratified conditions and varied between 0.0<S<36.6, and 0.5<S<36.1 from surface to bottom, during spring and neap, respectively. Although river discharge reduced from spring to neap tide partially mixed-highly stratified conditions (type 2b) remained in both periods, with advection and diffusion contributing with 34% and 66% to the net upstream salt flux in spring, respectively, and 56% and 44% in neap tide, respectively, which was attributed to the balance of tidal and baroclinic forcing and river discharge. The dominant downstream advective salt transport in both spring (12.5 kg.m-1s-1) and neap (15.2 kg.m-1s-1) tidal cycles suggests that there is little salt accumulation inside the São Francisco estuary.

scholarly journals LITTERFALL PRODUCTION IN MANGROVE FORESTS OF THE SÃO FRANCISCO RIVER ESTUARY, SERGIPE STATE, BRAZIL

FLORESTA ◽  
2019 ◽  
Vol 49 (4) ◽  
pp. 813
Author(s):  
Tiago De Oliveira Santos ◽  
Francisco Sandro Rodrigues Holanda ◽  
Luciano Carlos Sobral De Menezes ◽  
Karen Viviane Andrade Santana ◽  
Renisson Neponuceno De Araújo Filho
Keyword(s):  
River Estuary ◽  
Mangrove Forests ◽  
Sao Francisco River ◽  
Litterfall Production ◽  
São Francisco River
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