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• W4250743634 abstract "Abstract. An understanding of hydrological processes is vital for the sustainable management of groundwater resources, especially in areas where an aquifer interacts with surface water systems or where aquifer-interconnectivity occurs. This is particularly important in areas that are subjected to frequent drought/flood cycles, such as the Cressbrook Creek catchment in southeast Queensland, Australia. In order to understand the hydrological response to flooding and to identify inter-aquifer connectivity, multiple isotopes (δ2H, δ18O, 87Sr/86Sr, 3H and 14C) were used in this study in conjunction with a comprehensive hydrochemical assessment, based on data collected six months after severe flooding in 2011. The depleted stable isotope (δ2H and δ18O) signatures of the flood-generating rainfall were evident in surface water samples, indicating that these extreme events were a major source of recharge to the dam in the catchment headlands. Furthermore, stable isotopes confirmed that the flood generated significant recharge to the alluvium in the lower part of the catchment, particularly in areas where interactions between surface waters and groundwater were identified and where diffuse aquifer recharge is normally limited by a thick and relatively impermeable unsaturated zone. However, in the upper parts of the catchment where recharge generally occurs more rapidly due to the dominance of coarse-grained sediments in the unsaturated zone, the stable isotope signature of groundwater resembles the longer-term average rainfall values, highlighting that recharge was sourced from smaller rainfall events that occurred subsequent to the flood. Interactions between the bedrock aquifers and the alluvium were identified at several sites in the lower part of the catchment based on 87Sr/86Sr ratios, and supported by the hydrochemical assessment, which included the modelling of evaporation trends and saturation indices. The integrated approach used in this study facilitated the identification of hydrological processes over different spatial and temporal scales, and the method can be applied to other complex geological settings with variable climatic conditions." @default.
• W4250743634 created "2022-05-12" @default.
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• W4250743634 date "2014-04-01" @default.
• W4250743634 modified "2023-10-01" @default.
• W4250743634 title "Identifying flood recharge and inter-aquifer connectivity using multiple isotopes in subtropical Australia" @default.
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• W4250743634 doi "https://doi.org/10.5194/hessd-11-3711-2014" @default.
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