Three criteria reliability analyses for groundwater recharge estimations

Somaratne, Nara; Smettem, K.R.J.; Frizenschaf, Jacqueline

doi:10.1007/s12665-014-3121-0

Cited by 7 publications

(19 citation statements)

References 14 publications

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“…In Poocher Swamp, the majority of recharge is from a large volume of creek water discharge into two sinkholes, resulting in formation of a fresh water lens [29]. Groundwater basins Uley South [30,31], Robinson lens [31], and Blue Lake capture zone in Mount Gambier [28] are previously described and therefore essential hydrogeogical features of the basins are provided below.…”

Section: Description Of the Study Basinsmentioning

confidence: 99%

“…Water level response to annual rainfall is compared in the Uley South basin, a karst aquifer, with the adjacent Coffin Bay lens A, a diffuse recharge aquifer [31]. Both aquifers adjoin the coast.…”

Section: Aquifer Water Level Response To Extreme Rainfall Event and Amentioning

confidence: 99%

“…For application of conventional CMB to estimate total recharge, an average chloride concentration in the fresh water lens of 91 mg·L was made by Stadter and Love [60] in 1987. As part of the recharge estimation for the Blue Lake in Mount Gambier [31], Nguyen [61] used the urban storm water model MUSIC [62] for quantifying storm water runoff to drainage wells. In the study, rainfall and runoff process was modelled for the period 2007-2012 using a daily time step with daily rainfall and evaporation data.…”

Section: Comparison Of Conventional Cmb Estimated Recharge With Rechamentioning

confidence: 99%

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Characteristics of Point Recharge in Karst Aquifers

Somaratne¹

2014

Water

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Karstic groundwater basins are characterized by both point and diffuse recharge. This paper describes the hydrologic characteristics of point recharge and their influence on recharge estimation for four groundwater basins. Point recharge is highly transient and may occur in relatively short-time periods, yet is capable of recharging a large volume of water, even from a single extreme rainfall event. Preferential groundwater flows are observed in karst aquifers with local fresher water pockets of low salinity that develop around point recharge sources. Measurable fresh water plumes develop only when a large quantity of surface water enters the aquifer as a point recharge. In fresh water plumes, the difference in chloride concentrations in diffuse and point recharge zones decreases as the plumes become enriched through mixing. The relative contributions to total recharge from point sources using the measured gap between groundwater and rainwater chloride in the chloride vs. δ 18 O plot is not necessarily indicative of sinkholes not directly recharging the aquifer. In karst aquifers, recharge estimation methods based on groundwater age distribution; average annual rainfall and basin average chloride in the conventional chloride mass balance (CMB) method are questionable due to theoretical limitations and key assumptions of these methods not being met. In point recharge dominant groundwater basins, application of: watertable fluctuation, numerical groundwater modelling, Darcy flow calculation or water budget methods are more suitable for recharge estimation as they are independent of the particular mode of recharge. The duality of the recharge mechanism in karst aquifers suggests that modification to the CMB method may be required to include both point and diffuse recharge components.

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Section: Description Of the Study Basinsmentioning

confidence: 99%

Section: Aquifer Water Level Response To Extreme Rainfall Event and Amentioning

confidence: 99%

Section: Comparison Of Conventional Cmb Estimated Recharge With Rechamentioning

confidence: 99%

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Characteristics of Point Recharge in Karst Aquifers

Somaratne¹

2014

Water

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“…Numerical modeling is obviously the preferred choice for the spatial and temporal groundwater assessment role in investigating the effects of climate and human interventions in groundwater head fluctuations [8]. The model can predict the future behaviour of the phenomena and its uncertainty [9,10].…”

Section: Introductionmentioning

confidence: 99%

Groundwater Engineering in an Environmentally Sensitive Urban Area: Assessment, Landuse Change/Infrastructure Impacts and Mitigation Measures

2017

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A rise in the shallow unconfined groundwater at a site in Australia is causing water logging of the underground facility in the affected area. Realizing this problem, a study was conducted to identify the source of water that is causing the rise and to develop an implementation and operation plan of the mitigation (dewatering system). Modelling was undertaken using MODFLOW-SURFACT code, within the framework of Visual MODFLOW, to assess the spatial and temporal groundwater level at the site. The study undertaken incorporates compilation and assessment of available data, including a list of factual information reviewed, development of a conceptual groundwater model for the site and modelling of the pre and post development conditions. The outcomes of the assessment indicate water level rises due to the construction of the embankment are likely less than 0.12 m and changes in land, such as affected area burial, may change aquifer characteristics more significantly than the embankment. It is concluded that the elevated groundwater levels in the affected area are most likely a result of above average rainfall since 2007 and long term cumulative land use changes. The embankment construction is just one of many land use changes that have occurred both within and surrounding the affected area and likely only a minor contributor to the elevated water levels. Greater contribution may be attributed to re-direction of the natural flow paths the railway culvert weir reducing the overland flow gradient and ongoing changes (burial) within the affected area and including the embankment. The model findings gives answers on what factors may be/are causing/contributing to, the higher than usual groundwater levels in the study area. A combination of drainage and/or pumping (dewatering system) is suggested as a solution to overcome the problem of rising groundwater levels at the site. Further, the model output can aid in assessing mitigation options, including horizontal drainage networks and pumping to control for the rising water table conditions in the area, depending on the level of treatment and pathogenic criteria.

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“…A incerteza e erros na estimativa da recarga provêm de muitos fatores, incluindo: disponibilidade de dados confiáveis, aplicação de um modelo conceitual inválido, variabilidade espacial e temporal ignorada, erros de medida e de cálculo (HEALY, 2010;SOMARATNE;SMETTEM;FRIZENSCHAF, 2014). Este problema tende a crescer porque os diferentes processos de recarga podem ocorrer simultaneamente, como a presença, em uma região úmida, de grandes lagos e rios.…”

Section: Desafios Na Estimativa Da Recargaunclassified

Avaliação do impacto da substituição de pastagem por eucalipto na recarga de aquífero freático

Mattos¹

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Ao meu pai Manoel da Conceição P. de Mattos (in memoriam), que através do caráter e exemplo de vida, me ensinou o valor da honestidade, perseverança e do trabalho na vida um homem. AGRADECIMENTOSA Deus, por ter me dado esperança, mesmo não merecendo. Aos meus pais, Manoel e Edineide, sempre presentes em todos os momentos da minha vida. Se hoje cheguei onde estou é porque vocês sempre me incentivaram a lutar pelos meus sonhos, e me deram as condições para atingir os meus objetivos. Obrigado! Ao meu orientador, professor Edson C. Wendland, por ter me aceitado como seu orientado, por ter confiado em mim, por ter me corrigido e elogiado quando eu necessitava. Se hoje eu me interesso por água subterrânea, é por causa da sua influência.Ao meu irmão Neto, que trabalhou para que eu pudesse ter condições para estudar engenharia.À minha Tia, Cirlene, que abriu a porta do seu lar e me recebeu de braços abertos em Salvador, quase me adotando como seu filho. Obrigado pelo incentivo Tia.A todos os meus familiares, os quais sempre torceram por mim. Ao meu caro amigo Caio Cezar Catiste Silva, por ter dividido apartamento comigo durante o tempo que permaneci em São Carlos. Foi muito boa a convivência. Você é um grande engenheiro. Desejo muita felicidade e sucesso para você.Aos meus caros colegas do LHC: Teacher Murilo (Obrigado por ter dedicado parte do seu tempo para me transmitir um pouco do seu conhecimento. Aprendi muito com você.), Cabreira (Obrigado pelas aulas sobre evapotranspiração e pela boa convivência.), Davi (Infelizmente não foi possível aplicar o SPA no trabalho, mas no Latex deu tudo certo. Obrigado!), Antônio (Obrigado por ter me incentivado a vir para a EESC e por ter me dado morada quando cheguei em são carlos. Foi muito bom tê-lo conhecido.), a Ivan (Valeu pelos conselhos e pela aula de Latex.), Cristian (O minicurso de escrita e método científico foi muito proveitoso. Obrigado!), Paulo e Dulce (Foi muito bom tê-los conhecido. Obrigado pelo incentivo e conselhos.), A Jamil, Derly e Nathee (Obrigado pelos conselhos e por ter me ajudado a melhorar os meus relacionamentos com as pessoas que me cercam.)Ao técnico Roberto Bérgamo por ter me acompanhado durante esses dois últimos anos no trabalho de campo na Bacia do Ribeirão da Onça.A Sá, secretária da Pós-Graduação do Departamento de Hidráulica e Saneamento, por estar sempre disposta a tirar minhas dúvidas e me orientar no programa.Aos funcionários da Escola As plantações florestais, historicamente, estão associada a intensos debates sobre o seu impacto na dinâmica da água do solo ou subterrânea. Nesse contexto, este trabalho buscou avaliar os possíveis impactos da mudança de cobertura do solo, de pastagem para eucalipto, sobre o aquífero freático em zona de afloramento do Sistema Aquífero Guarani. A área de pesquisa está localizada na bacia do Ribeirão da Onça, situada no município de Brotas, no centro-leste do Estado de São Paulo. Essa é monitorada desde 2004. Foram utilizados dois métodos para avaliar o impacto da mudança de uso do solo, o método iWTF e o méto...

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Three criteria reliability analyses for groundwater recharge estimations

Cited by 7 publications

References 14 publications

Characteristics of Point Recharge in Karst Aquifers

Characteristics of Point Recharge in Karst Aquifers

Groundwater Engineering in an Environmentally Sensitive Urban Area: Assessment, Landuse Change/Infrastructure Impacts and Mitigation Measures

Avaliação do impacto da substituição de pastagem por eucalipto na recarga de aquífero freático

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