Estimating groundwater recharge and evapotranspiration from water table fluctuations under three vegetation covers in a coastal sandy aquifer of subtropical Australia

Fan, Junliang; Oestergaard, Kasper T.; Guyot, Adrien; Lockington, David

doi:10.1016/j.jhydrol.2014.08.039

Cited by 83 publications

(84 citation statements)

References 43 publications

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“…The results of the recharge model indicate that in nontrenched hillslopes, 79.6% of precipitation infiltrates into the ground and 48.6% becomes groundwater recharge (reaches the water table), whereas for trenched hillslopes, 83.3% of precipitation becomes infiltration and 52.1% becomes recharge. This value is fairly high compared to that of some studies (Jódar et al, ) but is within range of the value of other studies that have estimated recharge relative to precipitation in alpine catchments (Crosbie, Jolly, Leaney, & Petheram, ; Voeckler, Allen, & Alila, ; Fan, Oestergaard, Guyot, & Lockington, ).…”

Section: Resultssupporting

confidence: 77%

Does hillslope trenching enhance groundwater recharge and baseflow in the Peruvian Andes?

Somers

McKenzie

Zipper

et al. 2018

Hydrological Processes

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As Andean glaciers rapidly retreat due to climate change, the balance of groundwater and glacial meltwater contributions to stream discharge in tropical, proglacial watersheds will change, potentially increasing vulnerability of water resources. The Shullcas River Watershed, near Huancayo, Peru, is fed only partly by the rapidly receding Huaytapallana glaciers (<20% of dry season flow). To potentially increase recharge and therefore increase groundwater derived baseflow, the government and not‐for‐profit organizations have installed trenches along large swaths of hillslope in the Shullcas Watershed. Our study focuses on a nonglacierized subcatchment of the Shullcas River Watershed and has 2 objectives: (a) create a model of the Shullcas groundwater system and assess the controls on stream discharge and (b) investigate the impact of the infiltration trenches on recharge and baseflow. We first collected hydrologic data from the field including a year‐long hydrograph (2015–2016), meteorological data (2011–2016), and infiltration measurements. We use a recharge model to evaluate the impact of trenched hillslopes on infiltration and runoff processes. Finally, we use a 3‐dimensional groundwater model, calibrated to the measured dry season baseflow, to determine the impact of trenching on the catchment. Simulations show that trenched hillslopes receive approximately 3.5% more recharge, relative to precipitation, compared with unaltered hillslopes. The groundwater model indicates that because the groundwater flow system is fast and shallow, incorporating trenched hillslopes (~2% of study subcatchment area) only slightly increases baseflow in the dry season. Furthermore, the location of trenching is an important consideration: Trenching higher in the catchment (further from the river) and in flatter terrain provides more baseflow during the dry season. The results of this study may have important implications for Andean landscape management and water resources.

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Section: Resultssupporting

confidence: 77%

Does hillslope trenching enhance groundwater recharge and baseflow in the Peruvian Andes?

Somers

McKenzie

Zipper

et al. 2018

Hydrological Processes

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“…Features such as rainfall regimes, soil types, geological conditions, water table depths and alternative land uses affect groundwater balance components and can vary significantly between locations. While some researchers report a reduction in groundwater recharge because of afforestation (Fan et al , ), others report the opposite response (Krishnaswamy et al , ) and others project a mixed response that varies over time (Wyatt et al , ). In this study, groundwater exchanges flows (recharge and discharge) calculated from the afforested DT basin were similar to those found for the pastured LC basin.…”

Section: Discussionsupporting

confidence: 72%

“…However, such affects appear to fluctuate depending on climatic patterns and tree species present. In regards to groundwater recharge, some researchers have found a decreasing pattern (Finch, ; Le Maitre et al , ; Allen and Chapman, ; Calder, ; Birkinshaw et al , ; Fan et al , ). However, García Préchac et al () found less soil water retention at 10 kPa (field capacity) in different Uruguayan experimental plots of Eucalyptus plantations compared to retention levels found for the same soils covered by natural pastures.…”

Section: Introductionmentioning

confidence: 99%

Effects of afforestation on groundwater recharge and water budgets in the western region of Uruguay

Silveira

Gamazo

Alonso

et al. 2016

Hydrological Processes

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Uruguay has stimulated the development of its forest sector since the promulgation of Forest Law N° 15 939 in December of 1987. Nevertheless, the substitution of natural grasslands with forest plantations for industrial use has raised concerns regarding hydrological processes of groundwater recharge and water consumption involving evapotranspiration. The purpose of this study is to assess the effects of this substitution approach on water resources. Input data were collected from two small experimental watersheds of roughly 100–200 hectares located in western Uruguay. The watersheds are characterized by Eucalyptus Globulus ssp. Maidenni and natural grasslands for cattle use. Total rainfall, stream discharge, rainfall redistribution, soil water content and groundwater level data were collected. Groundwater recharge was estimated from water table fluctuations and from groundwater contributions to base flows. Seasonal and annual water budgets were computed from October of 2006 to September of 2014 to evaluate changes in the hydrological processes. The data show a decrease in annual specific discharge of roughly 17% for mean hydrological years and no conclusive effects on annual groundwater recharge in the forested watershed relative to the reference pasture watershed. Reduced annual specific discharge is equivalent to the mean annual interception. The computed actual annual evapotranspiration is consistent with international catchment measurements. Reduction rates vary seasonally and according to accumulated rainfall and its temporary distribution. The degree of specific discharge decline is particularly high for drier autumns and winters (32 to 28%) when the corresponding rainfall varies from 275 to 400 mm. These results are of relevance for water resources management efforts, as water uses downstream can be affected. These findings, based on a study period dominated by anomalous wet springs and summers and by dry autumns and winters, oppose earlier results based on 34 years of rainfall and discharge data drawn from Uruguayan large basins. Copyright © 2016 John Wiley & Sons, Ltd.

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“…3c) were still around 1 kPa in December, indicating that the water content was above the field capacity. A similar extinction coefficient of 1.0 m below the soil surface was also suggested for pine trees and native vegetation on Bribie Island (Harbison & Cox 1998;Fan et al, 2014).…”

Section: Fig3supporting

confidence: 60%

Estimating groundwater evapotranspiration by a subtropical pine plantation using diurnal water table fluctuations: Implications from night-time water use

Fan

Ostergaard

Guyot

et al. 2016

Journal of Hydrology

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Please cite this article as: Fan, J., Ostergaard, K.T., Guyot, A., Fujiwara, S., Lockington, D.A., Estimating groundwater evapotranspiration by a subtropical pine plantation using diurnal water table fluctuations: Implications from night-time water use, Journal of Hydrology (2016), doi: http://dx.doi.org/10. 1016/j.jhydrol.2016.09.040 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Estimating groundwater recharge and evapotranspiration from water table fluctuations under three vegetation covers in a coastal sandy aquifer of subtropical Australia

Cited by 83 publications

References 43 publications

Does hillslope trenching enhance groundwater recharge and baseflow in the Peruvian Andes?

Does hillslope trenching enhance groundwater recharge and baseflow in the Peruvian Andes?

Effects of afforestation on groundwater recharge and water budgets in the western region of Uruguay

Estimating groundwater evapotranspiration by a subtropical pine plantation using diurnal water table fluctuations: Implications from night-time water use

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