Temporal and spatial scaling of hydraulic response to recharge in fractured aquifers: Insights from a frequency domain analysis

摘要: Quantification of the recharge in fractured aquifers is particularly challenging because multiscale heterogeneity and range temporal scales involved. Here we investigate hydraulic response to a aquifer, using frequency domain approach. Transfer functions are calculated from 1 day up few years, for crystalline-rock aquifer located Ploemeur (S Brittany, France), groundwater level fluctuations as input output respectively. The spatial variability (characteristic time, amplitude, scaling) analyzed 10 wells sampling different compartments aquifer. Some transfer follow linear reservoir model behavior. On contrary, others display scaling at high that cannot be represented by classic models. Large-scale parameters, estimated low-frequency response, compared with those tests scales. transmissivity storage coefficient tends decrease scale, average estimates converge toward highest values large scale. small-scale diffusivities, which implies existence characteristic associated pathways, suggested origin unconventional