A methodology for extreme groundwater surge predetermination in carbonate aquifers: Groundwater flood frequency analysis

Najib, K.; Jourde, Hervé; Pistre, Séverin

doi:10.1016/j.jhydrol.2007.11.035

Cited by 31 publications

(36 citation statements)

References 41 publications

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“…As noticed, attempts have been made to use an EVA methodology within the area of groundwater flooding. The study by Najib et al (2008) introduced a methodology to perform flood frequency analysis and estimate hydraulic heads for 100 yr events (T 100 ). The underlying objective, to implement flood hazard assessment at a groundwater-dominated hydrological regime by estimating the 100 yr event at a given site, is the same as in the present study.…”

Section: Climate Change Impacts On Extreme Groundwater Levels In Relamentioning

confidence: 99%

“…Firstly, Najib et al (2008) investigated a dual or triple porosity carbonate aquifer with hydraulic head variations of up to 90 m, whereas the terrace sand aquifer in Silkeborg only had a tens of centimetres of observed variation and is relatively homogeneous compared to the aquifer in Southern France. Secondly, Najib et al (2008) reconstructed hydraulic heads used for the EVA by a global reservoir model with a non-physically based parameterization. Calibration of parameters was done for individual sites with observed hydraulic head and precipitation data.…”

Section: Climate Change Impacts On Extreme Groundwater Levels In Relamentioning

confidence: 99%

“…This is fundamentally different from the three dimensional, physically based groundwater-surface water model used in the present study. The non-physical description in Najib et al (2008) fits observed data very well because parameterization is done locally toward local observations, whereas calibration of a 3-D groundwater model, through the objective function, attempts to make the best overall parameterization toward widely distributed observations. The general discussion for and against models as global reservoir models versus more physically based models as MIKE SHE or MODFLOW models is beyond the scope of this paper.…”

Section: Climate Change Impacts On Extreme Groundwater Levels In Relamentioning

confidence: 99%

“…Thirdly, the present study includes climate change impacts in the EVA for hydraulic heads. This leads to an estimation of T-years representing the last 20 yr of the 21st century and not a representation of the next 100 yr with today's climate as shown by Najib et al (2008).…”

Section: Climate Change Impacts On Extreme Groundwater Levels In Relamentioning

confidence: 99%

“…Tinch et al, 2004;Pinault et al, 2005;Morris et al, 2007;Jackson et al, 2011;Upton and Jackson, 2011;Hughes, 2011) but very few studies have dealt with groundwater flooding in a frequency analysis context. One study (Najib et al, 2008) developed a groundwater flood frequency analysis method to estimate T-year hydraulic heads for a given return period (T ). The tool was developed for a building construction project over a karstic aquifer in Southern France where heavy rainfall induced a groundwater table rise and thereby flooding.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Climate change impact on groundwater levels: ensemble modelling of extreme values

Kidmose

Refsgaard

Troldborg

et al. 2013

Hydrol. Earth Syst. Sci.

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Abstract. This paper presents a first attempt to estimate future groundwater levels by applying extreme value statistics on predictions from a hydrological model. Climate scenarios for the future period, 2081-2100, are represented by projections from nine combinations of three global climate models and six regional climate models, and downscaled (including bias correction) with two different methods. An integrated surface water/groundwater model is forced with precipitation, temperature, and potential evapotranspiration from the 18 models and downscaling combinations. Extreme value analyses are performed on the hydraulic head changes from a control period (1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010) to the future period for the 18 combinations. Hydraulic heads for return periods of 21, 50 and 100 yr (T 21−100 ) are estimated. Three uncertainty sources are evaluated: climate models, downscaling and extreme value statistics. Of these sources, extreme value statistics dominates for return periods higher than 50 yr, whereas uncertainty from climate models and extreme value statistics are similar for lower return periods. Uncertainty from downscaling only contributes to around 10 % of the uncertainty from the three sources.

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Section: Climate Change Impacts On Extreme Groundwater Levels In Relamentioning

confidence: 99%

Section: Climate Change Impacts On Extreme Groundwater Levels In Relamentioning

confidence: 99%

Section: Climate Change Impacts On Extreme Groundwater Levels In Relamentioning

confidence: 99%

Section: Climate Change Impacts On Extreme Groundwater Levels In Relamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Climate change impact on groundwater levels: ensemble modelling of extreme values

Kidmose

Refsgaard

Troldborg

et al. 2013

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

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Stereoselective Synthesis of Cyclopropanes Based on a 1,2‐Chirality Transfer

Muehling

Wessig

2008

Chemistry A European J

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A stereoselective route to enantiomerically enriched bicyclic cyclopropane derivatives 13 is described which is based on a conceptually novel 1,2-chirality transfer approach. The hyperconjugative interaction of an electronically excited carbonyl group with the sigma* orbital of an adjacent C--X bond in the transition state of a hydrogen abstraction causes the preference of a certain conformation and consequently the differentiation between two diastereotopic methylene groups. The 1,2-chirality transfer is completed by a subsequent HX elimination which destroys the only stereogenic center in the reactants 12. Furthermore, it was found that contrary enthalpic and entropic influences result in the existence of an inversion temperature T 0. Upon crossing T 0 the stereoselectivity is reversed. Considering this temperature dependency, chirality transfer efficiencies of up to 83 % could be achieved. The absolute configuration of most products could be unambiguously determined by VCD spectroscopy combined with DFT calculations.

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Tree rings: A key ecological indicator for reconstruction of groundwater depth in the lower Tarim River, Northwest China

et al. 2019

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Groundwater is becoming increasingly important in extremely arid areas due to climate change and human activities. Little is known, however, regarding the longterm dynamics of groundwater due to the lack of long-term historical records of groundwater depth data. In this study, we investigated the relationship between hydrometeorology and tree rings of Populus euphratica (P. euphratica) and the feasibility of reconstructing historical groundwater depths from these tree rings in the lower reaches of the Tarim River, an extremely arid area in China. Tree-ring growth of P. euphratica mainly reflected historical changes in regional water environments (including runoff and shallow groundwater), rather than climatic variables (including temperature, precipitation, relative humidity, and sunshine hours). Groundwater depth constituted the key environmental factor for directly controlling P. euphratica growth.Linear regression models using tree rings were developed to reconstruct historical changes of groundwater depths in the calendar year (January-December) and the growing season (April-August) from 1950 to 2015. Results tracked well with the main hydrological events in the study area. Our findings demonstrate that tree rings of P. euphratica are a key and effective ecological indicator for quantitatively reconstructing and elucidating historical changes of groundwater depth in the lower reaches of the Tarim River. Additionally, the suitable sampling range for establishing tree-ring chronologies of P. euphratica and reconstructing groundwater depth is 0-300 m from the river channel in the lower Tarim River. Taking into consideration the lagged effect between runoff of the Ecological Water Conveyance Project (EWCP), decrease in groundwater and tree growth, we recommend that the optimal implementation time of ecological water conveyance is between the previous September and November in the lower Tarim River. This application will effectively improve the groundwater environment in the current year and ensure the growth of riparian trees.

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A methodology for extreme groundwater surge predetermination in carbonate aquifers: Groundwater flood frequency analysis

Cited by 31 publications

References 41 publications

Climate change impact on groundwater levels: ensemble modelling of extreme values

Climate change impact on groundwater levels: ensemble modelling of extreme values

Stereoselective Synthesis of Cyclopropanes Based on a 1,2‐Chirality Transfer

Tree rings: A key ecological indicator for reconstruction of groundwater depth in the lower Tarim River, Northwest China

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