Using multiple methods to investigate the effects of land-use changes on groundwater recharge in a semi-arid area
نویسندگان
چکیده
Abstract. Understanding the applicability and uncertainties of methods for documenting recharge rates in semi-arid areas is important assessing successive effects land-use changes understanding groundwater systems. This study focuses on estimating impacts a area southeast Australia. Two adjacent catchments were cleared ?180 years ago following European settlement, eucalypt plantation forest was subsequently established ?15 one catchments. Chloride mass balance analysis yields 0.2 to 61.6 mm yr?1 (typically up 11.2 yr?1). The lower these values probably represents prior land clearing, whereas higher likely reflects initial clearing. low pre-land-clearing are consistent with presence old (residence times 24 700 years) moderate-to-low hydraulic conductivities (0.31 0.002 m d?1) aquifers. Recharge estimated from tritium activities water table fluctuations reflect those using (15 500 yr?1) significantly than renewal (0.01 89 yr?1; typically <14.0 approach long-term average annual rainfall (?640 These unrealistic given evapotranspiration 600 preservation It that specific yield results fluctuation method overestimating rates, despite changes, present-day relatively modest. ultimately management resources regions Australia elsewhere.
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ژورنال
عنوان ژورنال: Hydrology and Earth System Sciences
سال: 2021
ISSN: ['1607-7938', '1027-5606']
DOI: https://doi.org/10.5194/hess-25-89-2021