Surface-groundwater interaction in unconfined sedimentary aquifer system in the Brazil’s tropical wet region

Abstract

Since groundwater and surface waters are important components of the hydrological system, determining their interaction is essential for the efficient management of water resources by predicting the consequences of interference, whether due to the growth of demand or due to climate change. However, integrated scientific studies on these water resources are scarce, including in the Guariroba’s Environmental Protection Area, responsible for supplying 31.3% of the Campo Grandem/MS’s population, representing a local water security element. Thus, this work had as objective to evaluate the interaction between surface-groundwater in an unconfined sedimentary aquifer system, based on hydrograph separation methodologies of base flow, Flow Duration Curve (FDC) analysis, Master Recession Curve (MRC) evaluation and verification of the relationship between the surface flow, piezometric levels (PL) of the wells and the monthly precipitation. The results indicates a proportional relationship between rainfall, superficial flow and PL variations; the FDC smooth slope suggests that the baseflow is sustained by the groundwater discharge, corresponding to 89% of the total flow; the low-flow index indicates that the groundwater’s storage capacity is about 80%; the Base-Flow Index (BFI) ranging from 0.804 to 0.921, indicates a stable flow regime, aquifer’s high permeability conditions, though not uniform, and low runoff.

Meshless method using fundamental solution applied to computational simulation of groundwater flow of real aquifers: study case (Guariroba’s APA and Juazeiro do Norte)

“…Hydraulic heads of Guariroba's APA wells were obtained in same expedition during an interval less than 24 hours and special care was taken to avoid pumping operations in last 2 days before measurement (Cavazzana et al, 2019). In Juazeiro do Norte city, hydraulic heads were provided by an annual Hydrological Resources Management Company of Ceará State (Companhia de Gestão de Recursos Hídricos do Estado do Ceará -COGERH) report.…”

“…rainy summer and dry winter. Figure 4 shows annual distribution of medium temperature and accumulated rainfall between 1996 and 2012 (Campo Grande, 1995Grande, , 2008Grande, , 2013Cavazzana et al, 2019).…”

Hydrogeochemical evaluation of groundwater and surface water interactions in an alluvial plain, Southeast Brazil

“…Hoelzel (2018) evaluated the acid mine drainage and the connectivity between aquifer and river in coal mines using hydrochemistry and stable isotopes. The analysis of river hydrographs aiming to evaluate base flow and aquifer recharge was studied by Melati (2018), Cavazzana et al (2019), Oliveira et al (2020), and Rosa (2018). Arantes (2003), Arantes et al (2006), and Arcari (2018) used seepage meters and observation wells to compute the GW–SW interactions (dynamics of water levels) in a creek.…”

Funcionamento hidropedológico de uma topossequência e a produção de água em uma bacia hidrográfica de primeira ordem no oeste paranaense

“…O Índice de Fluxo de Base (BFI, Base Flow Index ) o qual expressa a proporção do escoamento de base em relação ao deflúvio total produzido por uma bacia hidrográfica em séries históricas de longo prazo, tem sido utilizado para avaliar o efeito do solo e da geologia sobre o escoamento em canais fluviais, sendo importante no estudo da resposta hidrológica lenta em bacias hidrográficas (ABEBE;FOERCH, 2006;GABAS et al, 2019). Este índice é admensional, seus valores variam de 0 a 1, sendo que valores em torno de 0,8 indicam um regime de fluxo relativamente estável com menores oscilações sazonais na produção de água de um determinado rio (TALLAKSEN, 1995;CAVAZZANA, et al, 2019). De acordo com (ECKHARDT, 2008) o fluxo de base responde vagarosamente à precipitação pluviométrica e normalmente está associado à descarga de água do armazenamento subterrâneo, destacando-se do trabalho deste autor que existem diferentes métodos para a estimativa do índice, os quais podem fornecer distintos resultados.…”

“…Na investigação das relações solo-água, o estudo em topossequências (CALEGARI, M. R.;MARTINS, 2004;VIDAL-TORRADO, 2005;JUHÁSZ et al, 2006;COOPER, M., VIDAL-TORRADO, P., GRIMALDI, 2010;COOPER et al, 2013), o uso de amostras com estrutura preservada (SHARMA;UEHARA, 1968;MESQUITA, M. G. B. F.;MORAES, 2004;SOUZA et al, 2006;LIN, 2011LIN, , 2012aMA et al, 2017), a análise micromorfométrica dos poros quanto à dimensão, forma e continuidade ou conectividade (BOUMA, 1982;BUI;MERMUT;SANTOS, 1989;HALLAIRE;CURMI, 1993;MIEDEMA, 1997;SOUZA et al, 2006;NIELSEN, 2007;COOPER et al, 2012COOPER et al, , 2013COOPER et al, , 2017COOPER, 2019), o monitoramento do solo in situ (BOUMA, 1982(BOUMA, , 2012RANZINI et al, 2004;JUHÁSZ et al, 2006;LIN, 2006;LIN;DROHAN;GREEN, 2015), o estudo do comportamento do aquífero freático (FREEZE, 1972;RANZINI et al, 2004;GABAS, 2019), a consideração de diferentes escalas espaciais (MENDIONDO;TUCCI, 1997;LIN et al, 2005;…”