Sedimentological characteristics and geochemistry of lake waters of the<i>Rio Grande</i>basin, west of Bahia State (Brazil)

Santos, Gisele Barbosa dos; Castro, Paulo de Tarso Amorim

doi:10.1080/15715124.2016.1215323

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…The basin comprises 17 municipalities in Western Bahia where the climate ranges from humid to semi-arid (INEMA, 2014), and the Cerrado is its predominant biome (Santos and Castro 2016). As per Passo et al (2010), the introduction of agriculture in the Cerrado of Bahia, notably in Western Bahia, has effected a change in the economic, political and geographic profile of the region -a milestone in the Brazilian economic scene.…”

Section: Study Areamentioning

confidence: 99%

Cost of charging for water use in the Brazilian Cerrado hydrographic basin

Alencar¹,

Moreira²,

Silva³

2018

Rev. ambiente água

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This study analyzed the relative cost of charging for water use with respect to water users' production costs in the Grande River Basin, located in the Brazilian Cerrado, considering the principal charging methods existing in Brazil. The study was developed based on: the rights of use grant data surveys pertaining to water resources and the classification of bodies of water into usage classes; a simulation of charging for water use through various methods; and an analysis of the relative cost of charges on the production cost of the water users. The charging methods used by the following were studied: the Committee of the Basin of River Paraíba do Sul (CEIVAP), the Committee of Basins of Piracicaba, Capivari and Jundiaí Rivers (PCJ), the São Francisco River Basin Committee (CBHSF) and the Doce River Basin Committee (CBH-DOCE). The study verified that irrigated agriculture is the sector that uses the most water, representing 46.4% of the outflow granted in the basin. Considering the different charging methods, the collection in the basin of the Grande River potentially allows for investments of US$ 1.2 million (PCJ), US$ 920,000 (CEIVAP), US$ 426,000 (CBH-DOCE), or US$ 297,000 (CBHSF) in this region, leading to average relative costs of 0.68% (irrigation), 0.28% (human) and 0.08% (industry). For this reason, there is the possibility of implanting charges for water use in the Grande River Basin, with either the CEIVAP's or PCJ's method appearing to be the most suitable, given that the parameters of these mechanisms are in line with existing activities in the basin.

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Section: Study Areamentioning

confidence: 99%

Cost of charging for water use in the Brazilian Cerrado hydrographic basin

Alencar¹,

Moreira²,

Silva³

2018

Rev. ambiente água

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“…Nessa região são encontradas mais de 2.000 lagoas com diferentes morfologias e tamanhos (Santos & Castro, 2016). Geotectonicamente, essa área está situada no noroeste do Cráton do São Francisco, uma importante unidade geotectônica formada desde o Arqueano, que adquiriu estabilidade ao final do Evento Transamazônico (Alkmim, 2004).…”

Section: áRea De Estudounclassified

Análise de espículas de esponjas como indicadores paleoambientais em sedimentos lacustres no oeste da Bahia

Santos

Castro²,

Parolin

et al. 2017

Rev. bras. paleontol.

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-ANALYSIS OF SPONGE SPICULES AS PALEOENVIRONMENTAL INDICATORS IN WESTERN BAHIA LACUSTRINE SEDIMENTS.The use of sponge spicules in sediments as proxy data has been successful in paleoenvironmental reconstructions. We recovered two sedimentary cores in two ponds located in San Francisco lowland in Western Bahia to understand the paleoclimatic and the lacustrine system dynamics. Sedimentary facies and granulometric analysis were perfomed. Also, organic matter content and presence of diatoms frustules were studied, besides the identification and quantification of sponge spicules detected in sediments, which were dated by 14 C. The sediment age ranged between 8410 to 3929 yrs cal BP, corresponding to the Holocene. Sponge spicules of the following species were found: Dosilia pydanieli, Heterorotula fistula, Metania spinata, Oncoslera sp., Radiospongilla inesi and Tubella variabilis. Analysis of the results suggest that the two lakes have a standardized climate pattern alternating between drier and wetter climates in relation to the current climate condition. However, the two lakes differ regarding the sedimentation rate and the microfossil content the pond of the northern portion showed lentic and lotic alternated phases, indicating a paleodrainage at the beginning of the upper Holocene, while the evidences in the southern pond of the lake system there are only lentic phases. Such evidences suggest that other physiographic factors and climate influenced the dynamics of these lakes, such as structure, litholog and tectonics of the ponds substrates.Key words: Quaternary, Holocene, San Francisco lowland, sponges.RESUMO -A utilização de espículas de esponjas em sedimentos como dado proxy vem obtendo sucesso em proposições de reconstruções paleoambientais. Para compreender as condições paleoclimáticas e dinâmicas do sistema lacustre, localizado na Depressão do São Francisco, no oeste do estado da Bahia, foram recuperados dois testemunhos em duas lagoas. Foram realizadas análises de fácies, ensaios granulométricos, de conteúdo de matéria orgânica e presença de diatomáceas, além da identificação e quantificação de espículas de esponjas detectadas nos sedimentos holocênicos, que foram datados por 14 C. A idade das amostras dos sedimentos variou entre 8.410 a 3.929 cal. AP. Foram encontradas espículas das esponjas Dosilia pydanieli, Heterorotula fistula, Metania spinata, Oncoslera sp, Radiospongilla inesi e Tubella variabilis. As análises sugerem que as duas lagoas tiveram situações climáticas com alternância entre fases mais secas e mais úmidas em relação ao clima atual. No entanto, as duas lagoas diferem no que tange à taxa de sedimentação e conteúdo microfossilífero. Para a lagoa da porção norte os resultados evidenciaram alternância de fases lênticas e lóticas, indicando uma paleodrenagem no início do Holoceno superior, enquanto as evidências da lagoa ao sul do sistema lacustre indicam apenas fases lênticas. Tais evidências sugerem que outros fatores fisiográficos, além do clima, influenciaram a dinâmica dessas la...

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Sedimentological characteristics and geochemistry of lake waters of theRio Grandebasin, west of Bahia State (Brazil)

Cited by 2 publications

References 17 publications

Cost of charging for water use in the Brazilian Cerrado hydrographic basin

Cost of charging for water use in the Brazilian Cerrado hydrographic basin

Análise de espículas de esponjas como indicadores paleoambientais em sedimentos lacustres no oeste da Bahia

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