Análise Multitemporal e Caracterização dos Processos Erosivos no Baixo São Francisco Sergipano.

Holanda, Francisco Sandro Rodrigues; Santos, Cícero Marques dos; Casado, Ana Patrícia Barretto; Bandeira, Arilmara Ábade; Oliveira, Vandemberg Salvador de; Fontes, Luiz Carlos da Silveira; Rocha, Igor Pinheiro da; Filho, Renisson Neponuceno de Araújo; Góis, Suzilane Santos; Vieira, Thiago Roberto Soares

doi:10.20502/rbg.v8i2.96

Cited by 11 publications

(10 citation statements)

References 4 publications

(3 reference statements)

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“…A distribuição da erosão marginal pode variar de um ponto para o outro devido as características morfológicas e sedimentológicas do talude (Holanda et al, 2007), associados com as variações da velocidade da corrente, considerando que a velocidade é menor próximo às margens (Carvalho, 1994).…”

Section: Caracterização Do Processo De Erosão Das Margens Do Rio Miraunclassified

Characterization of the Erosion Process of the Miranda River Margins in the Region of Passo do Lontra, Corumbá, Mato Grosso do Sul

Gazolla

Gonçalves

2017

Anuário IGEO UFRJ

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ResumoA erosão nas margens está entre os processos mais dinâmicos da paisagem, resultante da relação das características hidrodinâmicas somadas às características da margem, envolvendo aspectos físicos e morfométricos dos barrancos, onde os aspectos determinantes das taxas de erosão são diretamente influenciados pelo uso da terra nas adjacências do canal. A importância da compreensão dos fenômenos hidrológicos, contatando-se a dinâmica e interação entre os elementos que compõe a erosão das margens na região do Pantanal. Assim, este trabalho teve como objetivo caracterizar o processo erosivo as margens do Rio Miranda, na região do Pantanal, microrregião do Abobral. Foram realizadas análises físicas e morfométricas das margens, na região no período de outubro/2014 a outubro/2015. Os resultados das análises demonstraram recuo médio das margens de 50,66cm e perda de 496,46kg/m² de solo, correspondendo à perda estimada de aproximadamente 12 ton ao longo das margens, sendo identificada a atuação do processo de corrosão nas margens da região. Palavras-chave: erosão marginal; corrasão; dinâmica fluvial; Rio Miranda AbstractThe riverbank erosion is among the most dynamic processes of the landscape, resulting from the ratio of hydrodynamic characteristics added to the margin characteristics, involving riverbank's physical and morphometric aspects, where the key aspects of erosion rates are directly influenced by land use in the vicinity channel. The importance of understanding the hydrological phenomena, by contacting the dynamics and interaction between the elements that make up the erosion of margins in the Pantanal. So, this study aimed to characterize the erosion of the riverbanks of the Miranda in the Pantanal, microregion of Abobral. Physical and morphometric analyzes of banks were performed in riverbanks material loss in the region from October / 2014 to October / 2015. The results of the analysis showed average retreat in margins of 50,66cm and loss 496,64kg/m² ground, corresponding to the estimated loss of approximately 12 ton along the banks, identifying the role of the corrasion process in the margins of the region.

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Section: Caracterização Do Processo De Erosão Das Margens Do Rio Miraunclassified

Characterization of the Erosion Process of the Miranda River Margins in the Region of Passo do Lontra, Corumbá, Mato Grosso do Sul

Gazolla

Gonçalves

2017

Anuário IGEO UFRJ

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“…According to Casado et al (2002), this causes the water depth to remain at the same level for long periods since the force of the current has increased effects on the bank at that level and promotes the removal of soil particles. Holanda et al (2007) explains that riverbank erosion along the lower course of the São Francisco River occurs primarily under normal day-to-day conditions even without destructive floods or other weather events; further, the author concludes that it is possible to observe the magnitude of the erosion process and retreat of the bank within a few days itself. Coops et al (1996) compared the effects of waves on artificial streams in the case of treatments with and without the protective vegetation and concluded that the erosion values for the unprotected banks were higher.…”

Section: Introductionmentioning

confidence: 98%

Meteorological and hydrological variables on occurrence of riverbank erosion along lower São Francisco river

Rocha

Holanda²,

Filho

et al. 2013

Rev. bras. eng. agríc. ambient.

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The objectives of this paper were to analyze the seasonal distributions of climatic and hydrological variables along the Lower São Francisco River, Northeastern Brazil, between the States of Sergipe and Alagoas, and further, to verify their relationships with the erosion of the right margin in Sergipe State. The investigated area comprises the sedimentary portions of the Lower São Francisco River, located at the CotinguibaPindoba Irrigated Perimeter. Historical records of variables such as rainfall, river streamflow velocity, river discharge, wind velocity and the predominant direction were collected from a climatological station as well as rain and streamflow gauges located in the municipality of Propriá. The rainfall that occurs in the region is considered non-erosive, 96.2% of the rain had intensity less than 25.0 mm h -1 . The evolution of erosion is explained by the increase in the outflow in February that peaked at 9,894.50 m³ s -1 and led to increases in the flow velocity. The rainfall regime interacts with the wind that blows predominantly from the eastern direction during the dry season and from the southeastern direction during the rainy season with maximum velocities of 5.5 and 8.0 m s -1 , respectively.Key words: river discharge, wind, rainfall, water resourcesVariáveis meteorológicas e hidrológicas sobre ocorrência de erosão no Baixo São Francisco RESUMO O objetivo deste trabalho foi analisar a distribuição sazonal de variáveis climáticas e hidrológicas ao longo do baixo curso do rio São Francisco, nordeste do Brasil, entre os estados de Sergipe e Alagoas e ainda verificar, também, suas relações com a erosão da margem direita no Estado de Sergipe. A área investigada compreende as porções sedimentares do Baixo São Francisco localizada no Perímetro Irrigado CotinguibaPindoba. Foram coletados os registros históricos de variáveis como a precipitação, a velocidade do fluxo do rio, vazão do rio, velocidade do vento e da direção predominante de uma estação climatológica, bem como chuva e medidores de vazão localizados no Município de Propriá. A precipitação que ocorre na região é considerada não-erosiva, 96,2% das chuvas tiveram intensidade menor que 25,0 mm h -1 . A evolução da erosão é explicada pelo aumento do fluxo em fevereiro que atingiu um máximo de 9894.50 m³ s -1 e levou a um aumento na velocidade do fluxo. O regime de chuvas interage com o vento, que sopra predominantemente na direção do leste durante a estação seca e da direção sudeste durante a estação chuvosa, com velocidades máximas de 5.5 e 8.0 m s -1 , respectivamente.

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“…Martins et al [7] report that the dams built along the SF river in the LSF sub region condition the volume of flow in the region of the SF river, and Barros [8] reports the Sobradinho Dam has changed the entire balance of the LSF's floodplains, thus extremely affecting human activities, linked to the river´s cycles. Environmental effects such as the modification of the river´s regime, the solid particles in suspension [9], erosive processes in its right bank in the Lower San Francisco Sergipano's (LSFS) section [10], the acceleration of marginal erosion, altering the landscape towards the "Irrigated Perimeters", endangerment of agricultural areas, restriction of idle areas resulting in loss of agricultural areas [11] are common in these locations. The environmental impact on wildlife, loss of harvests due to rodent outbreaks, water distribution shortages in the "Irrigated Perimeters" and technical assistance scarcity are some of the issues faced by the farmers in the LSFS.…”

Section: Introductionmentioning

confidence: 99%

Environmental Change and a Qualitative Approach to the Production System in “Irrigated Perimeters”: Current Model in the Lower San Francisco Sergipano, Northeastern Brazil

Santos

2018

WIT Transactions on Ecology and the Environment

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Until the 70s, the fertile Low San Francisco (LSF) Valley had several floodplain areas designed for rice-growing. For centuries, the San Francisco (SF) river floods allowed the riverbank population to develop their traditional systems for "rizicultura" (rice-growing), fishing and livestock farming. The building of the Sobradinho Dam changed the SF's river bed, causing serious environmental changes in the floodplain's ecosystem, its landscaping model, its use of the land in the valley's production system, going from a natural flood-dependant rice-growing agroecosystem to drainage and watering one. This study examines the impact farmers face with the current rice-growing model in the Lower San Francisco Sergipano (LSFS) and looks into how to minimize its effects as well as restoration strategies for these areas. The study was carried out at the LSFS's "Irrigated Perimeters", in Betume and Propriá (a subregion within LSF Valley), Northeastern Brazil (NEB) with key informants (farmers and Agricultural technicians). The results showed the impact on environmental, technical, social, economic and political levels. The study seeks to contribute with a reflection on the issues the key informants encounter with the current rice-growing model in these areas, which are a direct result of the change in the use of the land. It also hopes to generate discussions at governmental, scientific and social levels, where more complete environmental studies can be contemplated, focusing on the impacts of these actions on the LSF valley in the future.

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Análise Multitemporal e Caracterização dos Processos Erosivos no Baixo São Francisco Sergipano.

Cited by 11 publications

References 4 publications

Characterization of the Erosion Process of the Miranda River Margins in the Region of Passo do Lontra, Corumbá, Mato Grosso do Sul

Characterization of the Erosion Process of the Miranda River Margins in the Region of Passo do Lontra, Corumbá, Mato Grosso do Sul

Meteorological and hydrological variables on occurrence of riverbank erosion along lower São Francisco river

Environmental Change and a Qualitative Approach to the Production System in “Irrigated Perimeters”: Current Model in the Lower San Francisco Sergipano, Northeastern Brazil

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