Estabilidade temporal da potenciometria e da salinidade em vale aluvial no semiárido de Pernambuco

Júnior, Robertson Valério de Paiva Fontes; Montenegro, Abelardo Antônio de Assunção; Montenegro, Suzana Maria Gico Lima; Santos, Thaís Emanuelle Monteiro dos

doi:10.1590/s1415-43662012001100007

Cited by 10 publications

(10 citation statements)

References 19 publications

(24 reference statements)

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“…The box-plot analysis in Figure 2A exhibits several outliers for groundwater levels. Fontes Júnior et al (2012) confirmed in a previous study the presence of these "outliers" and interference in data dispersion. The driest periods have influenced such on extreme groundwater levels, enhanced by unsaturated drainage processes to the watercourse (KONUKCU; GOWING; ROSE, 2006;MONTENEGRO;.…”

Section: Resultssupporting

confidence: 83%

“…To study groundwater temporal variability, twelve years records (2002-2013) were used, from three stable piezometers for water table, and for three "near" stable piezometers for electrical conductivity, according Fontes Júnior et al (2012), as shown in …”

Section: Methodsmentioning

confidence: 99%

“…Mimoso alluvial valley in the Northeast semiarid has been intensively instrumented (MONTENEGRO, 1997), monitored and studied for groundwater recharging mechanisms (ALBUQUERQUE et al, 2015), groundwater spatial distribution (FONTES JÚNIOR et al, 2012;MONTENEGRO;, soil salinity spatial variation (MONTENEGRO et al, 2010), for agricultural support evaluation (SOUZA et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Fontes Júnior et al (2012) identified spatially representative piezometers for groundwater quantity and quality of in the Mimoso alluvial area using the temporal stability methodology. Such analysis successfully recognized locations representing the mean spatial behavior, thus reducing the number of samplings required for regular monitoring.…”

Section: Introductionmentioning

confidence: 99%

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Temporal dependence of potentiometric levels and groundwater salinity in alluvial aquifer upon rainfall and evapotranspiration

Júnior

Montenegro

2017

RBRH

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Rainfall uncertainty and high evapotranspiration rates in the semiarid regions not only play an important impact on surface water scarcity, but interfere on shallow groundwater quantity and quality. The aim of this study was to apply geostatistical methodology to analyze the time dependence of potentiometric levels and groundwater salinity in an intensively monitored alluvial aquifer upon agroclimatological variables, and thus investigate possible monthly and annual correlations. Statistically stable piezometers were considered for the temporal analysis, representing the mean behavior of the whole aquifer. It has been verified that stable piezometers for groundwater levels exhibited temporal dependence of 7 months, similar to the temporal scale of variation for monthly precipitation and potential evapotranspiration, which is consistent to the resulting crossed-semivariogram. Meanwhile, stable piezometers for electrical conductivity showed high uncertainty on temporal dependence scale, which ranged from 3 to 8 months. Thus, rainfall and evapotranspiration alone did not properly explain the temporal dynamics of groundwater salinity. The produced maps successfully identified the long term time pattern of groundwater variation, constituting an important support for water resources evaluation.Keywords: Shallow aquifer; Geostatistics; Water availability; Communal farming; Semiarid. RESUMOA incerteza das chuvas e as elevadas taxas de evapotranspiração nas regiões semiáridas apresentam não apenas um importante impacto na escassez de água superficial, mas interferem na qualidade e quantidade das águas subterrâneas. O objetivo deste estudo foi analisar a dependência temporal dos níveis potenciométricos e a salinidade das águas subterrâneas em aquífero aluvial intensamente monitorado sobre variáveis agroclimatológicas e assim investigar possíveis correlações mensais e anuais. Foram considerados piezômetros estatisticamente estáveis para a análise temporal, representando o comportamento médio do aquífero. Verificou-se que piezômetros estáveis a níveis exibiram dependência temporal de 7 meses, semelhante à escala temporal de variação para precipitação mensal e evapotranspiração potencial, o que é consistente com o semivariograma cruzado produzido. Entretanto, os piezômetros estáveis para condutividade elétrica apresentaram alta incerteza na escala de dependência temporal, que variou de 3 a 8 meses. Assim, as precipitações e a evapotranspiração isoladamente não explicam a dinâmica temporal da salinidade das águas subterrâneas. Os mapas produzidos identificaram com sucesso o padrão temporal de variação da água subterrânea, constituindo um importante suporte para a avaliação dos recursos hídricos.

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Section: Resultssupporting

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temporal dependence of potentiometric levels and groundwater salinity in alluvial aquifer upon rainfall and evapotranspiration

Júnior

Montenegro

2017

RBRH

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“…The measuring point of stable moisture was validated through the analysis of correlation between the mean of the response of the stable point and the mean of the other monitored points, as applied by Souza et al (2011) andFontes Júnior et al (2012).…”

Section: Methodsmentioning

confidence: 99%

Temporal stability of soil moisture in an experimental watershed in the Pernambuco semi-arid region

Silva

Montenegro

Melo

2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TSoil moisture estimation is very important in decision making regarding agricultural practices and investigations in hydrology. The aim of the study was to evaluate surface soil moisture temporal stability under two cover crop conditions in an experimental watershed in the Brazilian semi-arid region, aiming to identify stable points, thus reducing monitoring costs and highlighting the importance of temporal stability in a watershed. Fourty five soil moisture monitoring campaigns in the layers of 0-0.10 and 0.10-0.20 m were conducted using a capacitance probe (Diviner -2000®) during the period from 10/07/2010 to 03/25/2014, with soil cover under native bushy vegetation and degraded pasture, predominantly Brachiaria decumbens. Temporal stability was evaluated through the mean relative difference technique. The point located at the middle of a slope under pasture and bushes was the most stable, with determination coefficient of 90 and 92% for both layers.Estabilidade temporal da umidade do solo em bacia experimental do semiárido pernambucano R E S U M O A estimativa da umidade no solo é de grande relevância na tomada de decisão de práticas agrícolas e pesquisas na área da hidrologia. Objetivou-se, neste estudo, avaliar a estabilidade temporal da umidade do solo nas camadas superficiais em duas condições de cobertura vegetal em uma bacia hidrográfica experimental, no semiárido brasileiro, buscando-se identificar pontos com maior estabilidade da umidade desonerando, assim, custos de monitoramento e ressaltando a importância da estabilidade temporal em uma bacia hidrográfica. Realizaram-se 45 campanhas de monitoramento de umidade do solo nas camadas de 0-0,10 e 0,10-0,20 m utilizando a sonda capacitiva/Diviner -2000® no período de 07/10/2010 a 25/03/2014, com cobertura do solo e presença de vegetação arbustiva natural, além de pastagem degradada com predominância de capim Braquiária (Brachiaria decumbens). A estabilidade temporal foi avaliada por meio da diferença relativa média. O ponto localizado em meia-encosta da bacia em presença de pastagem foi o mais estável, com coeficientes de determinação de 90 e 92% para ambas as camadas.

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Dinamica da Contaminação por Nitrato em Água Subterranea de Distrito de Irrigação no Nordeste Brasileiro

Aquino¹,

Andrade²,

Luna³

et al. 2014

Anais Do II Inovagri International Meeting - 2014

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Estabilidade temporal da potenciometria e da salinidade em vale aluvial no semiárido de Pernambuco

Cited by 10 publications

References 19 publications

Temporal dependence of potentiometric levels and groundwater salinity in alluvial aquifer upon rainfall and evapotranspiration

Temporal dependence of potentiometric levels and groundwater salinity in alluvial aquifer upon rainfall and evapotranspiration

Temporal stability of soil moisture in an experimental watershed in the Pernambuco semi-arid region

Dinamica da Contaminação por Nitrato em Água Subterranea de Distrito de Irrigação no Nordeste Brasileiro

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