Towards optimal sampling schedules for integral pumping tests

Leschik, Sebastian; Bayer‐Raich, Martí; Musolff, Andreas; Schirmer, Mario

doi:10.1016/j.jconhyd.2011.01.004

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…A specific feature of urban areas is the presence of water mains, whose leakages can significantly contribute to groundwater recharge (Barrett et al, 1999;Leschik et al, 2011;Musolff et al, 2009;Rutsch et al, 2008). Depending on the respective depths of the water mains (water supply system and sewer conduits) and the aquifer, water can either infiltrate or exfiltrate the mains.…”

Section: Water Budget Calculationmentioning

confidence: 99%

Impact of urbanization on groundwater recharge rates in Dübendorf, Switzerland

Minnig

Moeck

Radny

et al. 2018

Journal of Hydrology

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118

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Groundwater, as the world's most important reserve of available fresh water, is known to be affected by urbanization. Managing this resource in a sustainable way is critical for water resource management. Groundwater recharge rates in urban areas remain however still poorly understood and under-researched and knowledge about these rates and their expected changes under increasing urbanization is therefore of primary importance. This study aims to give insight into urban groundwater recharge by performing water budget calculations for four different time periods for an urban study site in northern Switzerland. In order to take into account uncertainty in parameter values a Monte Carlo (MC) approach was carried out. Our study highlights a strong positive correlation between groundwater recharge rates and the extent of the urban area. In detail, at the study site urban areas expanded from 6% in 1880 to 44% in 2009, leading to an increase in the mean groundwater recharge rate. However, the increase amount in recharge remains uncertain and varies between 29% and 67% depending on the parameter combination originating from the MC approach. Based on our water budget calculations, the transformation of natural landscapes into impervious areas leads to an increase in groundwater recharge rates due to the reduction of evapotranspiration that more than compensates for the increase in runoff. Furthermore, water main leakages contribute to an increase in recharge rates. Overall, we demonstrate that a better understanding of groundwater recharge changes in urban areas is required to move towards a sustainable water management. We hope that this example will encourage the hydrogeological community to pay more attention to urban groundwater recharge. Highlights • Urban groundwater recharge rate assessment through water budget calculations • Urbanization leads to a reduction of evapotranspiration • Water leakages contribute to recharge rates increase (up to 10% at the study site) • Increasing groundwater recharge rates due to urbanization at Dübendorf, Switzerland

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Section: Water Budget Calculationmentioning

confidence: 99%

Impact of urbanization on groundwater recharge rates in Dübendorf, Switzerland

Minnig

Moeck

Radny

et al. 2018

Journal of Hydrology

Self Cite

118

View full text Add to dashboard Cite

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“…However, the uncertainty of the IPT method derives from a strong concentration gradient [28] and plume position relative to the pumping well [29]. Leschik et al [30] studied the optimal sampling schedules for IPT. Based on inversion assumptions and positions of the wells, the IPT method is suitable for studying plumes when the aquifer has high hydraulic conductivity.…”

Section: Introductionmentioning

confidence: 99%

Localization of Groundwater Contaminant Sources Using Artificially Enhanced Catchment

Zhao

Zhang

Chen

et al. 2020

Water

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The localization of groundwater contaminant sources is the first and most fundamental step when dealing with site contamination problems. This paper presents a novel approach for groundwater pollution source identification in a site with low-velocity groundwater in which a strategy of an artificially enhanced catchment is adopted. The distance from a pumping well (artificial sink) to the source zone (unknown source) is calculated by integrating the concentration time series and well flow. Then, the orientation of the source well is delineated by applying the method of distance intersection. This method is suitable for an approximately homogeneous aquifer with average hydraulic conductivity ranging from 1 × 10−6 to 1 × 10−5 m/s and a contaminant whose transport process can be generalized to convective migration. The developed method was applied to an industrial contaminated site using three pumping wells and two observation wells. The results demonstrated that four potential source positions were identified. Among these, two positions situated near the production workshop were excluded by observation well responses. The remaining two positions located near the drain were identified as preferred treatment sources. Electrical prospecting showed source orientation consistent with the artificially enhanced catchment results. This proved that the method is effective and provides an alternative tool to help solve the problem of source identification in the first stage of remediation in sites with low-velocity groundwater.

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