20 research outputs found
Structural control over well productivity in the Jundiaà River Catchment, Southeastern Brazil
Investigation of the influence of lineaments, lineament intersections and geology on groundwater yield in the basement complex terrain of Ondo State, Southwestern Nigeria
Lithostratigraphic contact – a significant site for hydrogeological investigation in crystalline fractured-rock terrains
Hydrogeological factors: their association and relationship with seasonal water-table fluctuation in the composite hardrock Aravalli terrain, India
PhÆ°Æ¡ng pháp phân tÃch viá»…n thám tổng hợp để láºp bản đồ tà i nguyên nÆ°á»›c dÆ°á»›i đất ở Thung lÅ©ng Mèo Vạc, Việt Nam
Groundwater flow systems in turbidites of the Northern Apennines (Italy): natural discharge and high speed railway tunnel drainage
A conceptual model of groundwater flow systems in turbiditic fractured aquifers is proposed, taking into account natural discharge pattern of the hydrogeologic system and the system perturbation induced by tunnel drainage. Silico-clastic and marly calcareous turbidites outcrop extensively in Northern Apeninnes (Italy) and paper deals with the assessment of the aquifer-like behaviour of these units, up to now considered as aquitards, as reflected by the huge amounts of groundwater locally drained by tunnels for the high speed railway (HSR) connection between Bologna and Florence. The study is based on the analysis of a huge amount of hydrological data (springs, streams and tunnels discharge) collected by a monitoring activity performed for a 10 years time-span, integrated by hydrochemical and isotopic analysis on surface and tunnel waters and a stream-tunnel tracer test. In a turbiditic aquifer recession analysis permits to discriminate groundwater flow systems, to calculate recharge relative to the up-stream reach portion and to locate springs more vulnerable to tunnel drainage impacts. Natural discharge is stream-focused and, as the tunnel drainage is for 85% formed by active recharge groundwater, the impact on the stream base-flow is severe with abatement of natural discharge budget component up to 2/3 of natural value