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Seasonal variations of the stable isotope, oxygen-18 ( 18 O), were used to estimate mean residence times (MRTs) of water in two Valley and Ridge Province watersheds in central Pennsylvania. MRT was estimated by applying 18 O input precipitation signatures to response function models that describe flow conditions in the subsurface system. Precipitation 18 O is...
Based on previous studies, it can be hypothesized that mean residence times of water increase with increase of both sampling depth and upslope contributing area. To test this hypothesis, mean residence times of waters were evaluated with conceptual flow models using nearly sinusoidal variations of δD in rainfall and throughfall in two adjacent steep unchannelled catchments in the Tanakami Mountains...
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