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- W1975518689 abstract "The depth distributions of environmental chloride, deuterium and oxygen-18 in the deep sands (> 20 m) were monitored with a view to estimate average recharge to groundwater. The investigated area is located on the southwestern coast of Western Australia and supports a perennial native woodland vegetation. By using a steady state model based on the conservation of chloride, the average areal recharge was estimated to be approximately 15% of the average precipitation (775 mm yr−1). Whilst the Cl− concentration of groundwater was relatively uniform, there was a considerable spatial variability in the depth distribution of Cl− in the unsaturated zone. An approximate method of data analysis is developed. Application of this to Cl− data shows that possibly some 50% of the total annual recharge occurs via movement of water through preferred pathways, thus bypassing the soil matrix. Stable isotope (deuterium and oxygen-18) data show that there has been some isotopic enrichment due to evaporation of the rainfall, but the extent of enrichment appears to be too small to estimate recharge rates reliably. It is argued that relatively small isotopic enrichment occurs in the system studied since the direct evaporation from soil is a rather small component of the total evapotranspiration. The observations on the depth distribution of isotopes qualitatively support the presence of a bimodal system for water movement through the profile, as was suggested by the analysis of chloride data." @default.
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- W1975518689 date "1985-10-01" @default.
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- W1975518689 title "Groundwater recharge estimation using chloride, deuterium and oxygen-18 profiles in the deep coastal sands of Western Australia" @default.
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- W1975518689 doi "https://doi.org/10.1016/0022-1694(85)90169-6" @default.
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