Modelagem da dinâmica de umidade do solo em diferentes condições de cobertura no semiárido pernambucano

Silva, José Roberto Lopes da; Montenegro, Abelardo Antônio de Assunção; Monteiro, Adriano Luiz Normandia; Silva, Valdemir de Paula e

doi:10.5039/agraria.v10i2a4219

Cited by 14 publications

(24 citation statements)

References 14 publications

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“…High variability of rainfall results from sequences of dry and wet periods (MELO; MONTENEGRO, 2015; BERNDT; RABIEI; HABERLANDT, 2014), prolonged drought and rainfall occurring at beginning of the hydrological year in region (SANTOS; SOUZA; MONTENEGRO, 2016;SILVA et al, 2015). Thus, rainfall does not adhere to a Normal probability distribution.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

Júnior

Montenegro

2017

RBRH

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“…In the present study, the increase of water percolation to the shallow aquifer was approximately 11 times greater in the reforestation scenario. In Brazil and in the world, several studies have been developed with the objective of verifying the effects of the land-use changes on the surface runoff dynamics in watersheds (Aragão et al, 2013;Blainski et al, 2011;Rodrigues et al, 2015;Silva et al, 2015;. Blainski et al (2011) applied the SWAT model to the Araranguá River Basin to evaluate the influence of agricultural activities on the basin's water availability.…”

Section: Calibration and Validation Analysis For Streamflow And Soil mentioning

confidence: 99%

“…In Brazil, between 1999 and 2015, the model was used in more than 100 studies published in Brazilian and international journals (Bressiani et al, 2015). The applications of the SWAT model include studies of the streamflow calculation (Brighenti et al, 2016;Melo Neto et al, 2014;Aragão et al, 2013;Andrade et al, 2013), transport of sediments and pollutants (Silva and Medeiros, 2014;Veiga, 2014;Galharte et al, 2014), and in the quantification of impacts resulting from changes in land use on hydrological and sedimentological dynamics (Aragão et al, 2013;Blainski et al, 2011;Rodrigues et al, 2015;Silva et al, 2015;. Santos (2015) analyzed sediment production and its spatial distribution with the SWAT model in the Tapacurá River Basin (472 km²), State of Pernambuco.…”

Section: Introductionmentioning

confidence: 99%

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Hydrological modeling of an experimental basin in the semiarid region of the Brazilian State of Pernambuco

Magalhães¹,

Montenegro²,

Andrade³

et al. 2018

Rev. ambiente água

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Hydrological simulation models have proven to be an important tool for managing and planning water resources, enabling the assessment of the impacts of rainfall on surface runoff and soil moisture. This work therefore aimed to apply the SWAT model for the analysis of hydrological processes in the Experimental Basin of the Jatobá Stream, in the semiarid region of the State of Pernambuco, Brazil, considering the calibration and validation of the model from streamflow and soil moisture data. Moreover, the study investigated hydrological effectiveness in a recovery scenario in areas of higher topographic elevation of the arborescent Caatinga and the behavior of the hydrological components under an agricultural expansion scenario. Events which occured between 2009 and 2010 were used to calibrate and validate streamflow and soil moisture data. The calibration and validation of streamflow exhibited efficiency coefficients (NSE) of 0.58 and 0.42, respectively, and 0.53 and 0.46 for soil moisture. The adjustment of the parameters was considered adequate for representing streamflow recession periods. It was also verified that the alternative process of calibration and validation with soil moisture reduced uncertainty. Regeneration of the vegetative cover over 21% of the hilltop areas of arborescent Caatinga led to a significant increase in percolation (42%) and a decrease of 34% in soil moisture (due to water consumption by plants), thus contributing to the recovery of headwaters, increasing resilience to water scarcity. On the other hand, the 38% expansion of agriculture caused an increase of 11% in surface runoff and, consequently, an increase of 10% in soil moisture.

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“…Existem grandes investimentos em pesquisas de campo, bem como avanços e contribuições computacionais que agregam valor no levantamento da movimentação de água e soluto no solo (Silva et al, 2015).…”

Section: Introductionunclassified

Estratégia Para O Uso Racional E Sustentável Da Água Na Agricultura

Rodrigues¹,

Menezes²

2017

Anais Do IV Inovagri International Meeting - 2017

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RESUMO: Na agricultura, a importância da água para o sucesso das lavouras é inquestionável.No entanto, necessita-se buscar o equilíbrio entre os interesses da produção com os critérios socioambientais. A irrigação de lavouras deve demandar controles eficientes do conteúdo de água no solo, primando pelo uso racional e ecologicamente sustentável. Foi desenvolvido nesta pesquisa uma aplicação Web-Mobile, adaptada para que dispositivos computacionais (computadores e smarthpones) pudessem acessar o atual teor de água no solo. A leitura da umidade do solo era registrada por sensor e os dados armazenados em determinado banco de dados. A estação de controle dedicada não ultrapassou seus limites de processamento e armazenamento volátil, onde nesse aproximou-se da marca de 90% de utilização de memória RAM e naquele, 62% de uso do processador. O trabalho permitiu visualizar tanto o nível atual da umidade no solo, quanto o pretérito em gráfico dinâmico. PALAVRAS-CHAVE:Irrigação automatizada, umidade do solo, monitoramento em tempo real. STRATEGY FOR RATIONALIZED AND SUSTAINABLE WATER USE IN AGRICULTURE SUMMARY:The importance of water for the success of crops in agriculture is unquestionable.However, it is necessary to find a balance between productivity requirements and socioenvironmental aspects. Crop irrigation requires efficient controls of water in the soil, seeking a rationalized and ecologically sustainable use. A Web-Mobile application was developed for this research, adapted so that computer devices (computers and smartphones) could access current water levels in the soil. The soil humidity reading was recorded by a sensor and the data stored in specialized database. The dedicated control station did not exceed its volatile storage and processing limits, where the first it was close to 90% RAM memory use and in the later, 62% of processor use. The study allowed the visualization of both current and past soil humidity levels on a dynamic graph.

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Modelagem da dinâmica de umidade do solo em diferentes condições de cobertura no semiárido pernambucano

Cited by 14 publications

References 14 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

Hydrological modeling of an experimental basin in the semiarid region of the Brazilian State of Pernambuco

Estratégia Para O Uso Racional E Sustentável Da Água Na Agricultura

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