Diurnal fluctuations in shallow groundwater levels and streamflow rates and their interpretation – A review

Gribovszki, Zoltán; Szilágyi, József; Kalicz, Péter

doi:10.1016/j.jhydrol.2010.02.001

Cited by 219 publications

(167 citation statements)

References 53 publications

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“…Moreover, the comparison between daytime (12:00 to 18:00) and nighttime (0:00 to 6:00) water table signals in Metouia Oasis revealed, as expected, a downward trend during daytime induced by the high evaporative demand and an upward trend during nighttime when less evapotranspiration is occurring. This pattern is comparable to other shallow groundwater environments where the diurnal cycle was directly linked with evapotranspiration as the plants try to meet their water demands from the soil moisture or directly from the groundwater via their root systems (Gribovszki et al, 2010). Table I summarizes the rate of water table changes during daytime and nighttime in Metouia Oasis.…”

Section: Resultssupporting

confidence: 58%

A high measurement frequency based assessment of shallow groundwater fluctuations in Metouia Oasis, South Tunisia

Ibrahimi

Miyazaki

Nishimura

2010

Hydrological Research Letters

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Abstract:The Metouia Oasis (South Tunisia) is increasingly being impacted by high soil salinity, leading to yield losses and ultimately to farmland abandon. In this area shallow groundwater rise is considered the major factor responsible for salt accumulation in soils. However, limited data exist on groundwater fluctuations in Metouia Oasis, despite the criticality of such information for accurate soil salinity assessment. In this study, groundwater behavior was monitored at a high measurement frequency. An observation well was installed and equipped with a water level sensor (Diver DI240, Van Essen Instrument) to record the groundwater fluctuation at 30 minute intervals. The results showed that at seasonal basis, groundwater was characterized by a declining phase during spring and summer seasons followed by a rising phase starting from mid-October. Further, the hydrograph was characterized by several rapid water table rises following recharge events followed by extended periods of water table decline. The hourly observations at daily basis displayed strong evidence of diurnal effects on groundwater patterns. The results from this study suggest that consideration should be given to monitoring water table behavior in Metouia Oasis more frequently in order to capture daily and seasonal patterns.

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Section: Resultssupporting

confidence: 58%

A high measurement frequency based assessment of shallow groundwater fluctuations in Metouia Oasis, South Tunisia

Ibrahimi

Miyazaki

Nishimura

2010

Hydrological Research Letters

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“…18:00-06:00; Fahle and Dietrich, 2014). In the method of Gribovszki et al (2008), recovery was estimated from the time rate of change in depth-to-groundwater, and this important upgrade reduced the error of recovery estimates (Gribovszki et al, 2010;Fahle and Dietrich, 2014).…”

Section: Sub-daily Fluctuation In Groundwater Depthmentioning

confidence: 99%

Groundwater-dependent ecosystems: recent insights from satellite and field-based studies

Eamus

Zolfaghar

Villalobos‐Vega

et al. 2015

Hydrol. Earth Syst. Sci.

132

112

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Abstract. Groundwater-dependent ecosystems (GDEs) are at risk globally due to unsustainable levels of groundwater extraction, especially in arid and semi-arid regions. In this review, we examine recent developments in the ecohydrology of GDEs with a focus on three knowledge gaps: (1) how do we locate GDEs, (2) how much water is transpired from shallow aquifers by GDEs and (3) what are the responses of GDEs to excessive groundwater extraction? The answers to these questions will determine water allocations that are required to sustain functioning of GDEs and to guide regulations on groundwater extraction to avoid negative impacts on GDEs.We discuss three methods for identifying GDEs: (1) techniques relying on remotely sensed information; (2) fluctuations in depth-to-groundwater that are associated with diurnal variations in transpiration; and (3) stable isotope analysis of water sources in the transpiration stream.We then discuss several methods for estimating rates of GW use, including direct measurement using sapflux or eddy covariance technologies, estimation of a climate wetness index within a Budyko framework, spatial distribution of evapotranspiration (ET) using remote sensing, groundwater modelling and stable isotopes. Remote sensing methods often rely on direct measurements to calibrate the relationship between vegetation indices and ET. ET from GDEs is also determined using hydrologic models of varying complexity, from the White method to fully coupled, variable saturation models. Combinations of methods are typically employed to obtain clearer insight into the components of groundwater discharge in GDEs, such as the proportional importance of transpiration versus evaporation (e.g. using stable isotopes) or from groundwater versus rainwater sources.Groundwater extraction can have severe consequences for the structure and function of GDEs. In the most extreme cases, phreatophytes experience crown dieback and death following groundwater drawdown. We provide a brief review of two case studies of the impacts of GW extraction and then provide an ecosystem-scale, multiple trait, integrated metric of the impact of differences in groundwater depth on the structure and function of eucalypt forests growing along a natural gradient in depth-to-groundwater. We conclude with a discussion of a depth-to-groundwater threshold in this mesic GDE. Beyond this threshold, significant changes occur in ecosystem structure and function.

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“…The diurnal signal was observed in the black locust and grey poplar stands; therefore, the water uptake from the groundwater was estimated (Gribovszki et al 2010). The studied coniferous stands are unable to reach and uptake the groundwater from deeper layers (the diurnal signal was not observed).…”

Section: Figure 6 Interception As a Function Of Rainfall (Between Mamentioning

confidence: 99%

Monitoring of the Hydrological Balance in the Area of the Kiskunság National Park Directorate

Bolla¹,

Németh²

2017

Acta Silvatica Et Lignaria Hungarica

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-The aim of this paper is to show how hydrological measurements made in forests and grasslands can contribute to the conservation treatment of ecologically significant habitats. The study was carried out in three different forest stands and their surrounding grasslands in the area of the Kiskunság National Park Directorate between 2012 and 2015. Different methods were applied during the research of the water balance. The average values of canopy interception were 23% in the Scots pine stand and 19.2% in the grey poplar stand. Rainfall quantity, intensity, and dispersion as well as tree structure and health greatly influenced interception. The transpiration values were 205 mm in the coniferous stand, 405 mm in the deciduous stand, and 370 mm in the black locust stand. The water balance of the habitats show that the water uptake is much lower in the grasslands than it is in the surrounding forest stands. precipitation / soil moisture / interception / water balance / forest stands Kivonat -Hidrológiai vizsgálatok a Kiskunsági Nemzeti Park Igazgatóság területén. Jelen vizsgálat a különböző erdőállományokban és gyepterületeken végzett hidrológiai mérések alapján egészíti ki, támasztja alá az egyes ökológiai szempontból jelentős élőhelyek szakszerű természetvédelmi kezelését. A vizsgálatok a Kiskunsági Nemzeti Park Igazgatóság működési területén elhelyezkedő három erdőrészletben és közvetlen közelükben lévő gyepterületen folytak 2012-2015 között. Munkánk során különféle módszereket alkalmaztunk az élőhelyek vízháztartásának vizsgálatához. A koronaintercepció átlagos értéke az erdei fenyves állományban 23%, ezzel szemben a szürke nyáras állományban 19,2% volt. Az intercepció mértékét döntően befolyásolta a leérkező csapadék mennyisége, intenzitása, eloszlás és a faállomány szerkezeti jellemzői és egészségi állapota. A transpiráció értéke a tűlevelű állományban 205 mm, a nyáras faállományban 405 mm és az akácos állományban 370 mm volt. Az élőhelyek vízháztartásának vizsgálata során megállapítottuk, hogy a vizsgált tisztások vízfogyasztása jóval alacsonyabb, mint a mellette elhelyezkedő erdőállományoké.csapadék / talajnedvesség / intercepció / vízháztartás / erdőállományok *

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Diurnal fluctuations in shallow groundwater levels and streamflow rates and their interpretation – A review

Cited by 219 publications

References 53 publications

A high measurement frequency based assessment of shallow groundwater fluctuations in Metouia Oasis, South Tunisia

A high measurement frequency based assessment of shallow groundwater fluctuations in Metouia Oasis, South Tunisia

Groundwater-dependent ecosystems: recent insights from satellite and field-based studies

Monitoring of the Hydrological Balance in the Area of the Kiskunság National Park Directorate

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