The program Menyanthes combines a variety of functions for managing, editing, visualizing, analyzing\ud and modeling hydrogeologic time series. Menyanthes was initially developed within the scope of the PhD\ud research of the first author, whose primary aimwas the integration of data and physically-based methods\ud for modeling time series of groundwater heads. As such, time series analysis forms the heart of\ud Menyanthes. Within Menyanthes, time series can be modeled using both the ARMA and PIRFICT methods.\ud The PIRFICT method is a new method of time series analysis that has practical advantages and facilitates\ud physical interpretation and implementation of knowledge on physical behavior. Analytic solutions to\ud specific hydrogeologic problems may be used as response function, along with their physically-based\ud parameters. A more general approach is possible using Skew-Gaussian distribution functions, which\ud prove to fit the behavior of hydrogeologic (and other) systems well. Use of such functions within the\ud PIRFICT method substantially simplifies the model identification procedure, as compared to the traditional\ud Box-Jenkins procedure. PIRFICT models may be fitted to a large number of time series in batch.\ud Spatial patterns that emerge in the results provide useful, additional, and independent information,\ud which adds another dimension to time series analysis. Their interpretation is supported by the spatial\ud visualization and analysis tools of Menyanthes. The PIRFICT method also facilitates the integration of time\ud series and spatially-distributed models via, e.g., moment-generating differential equations. The PIRFICT\ud method may prove to be of use for other types of time series as well, both within and outside the realm\ud of environmental sciences
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