GWSDAT includes the following tools for trend visualization and detection:
Spatial plot: For the analysis of spatial trends in solute concentrations, groundwater flow and, if present, NAPL thickness. Overlaid on this plot are the predictions of the spatiotemporal solute concentration smoother which is a function that simultaneously estimates both the spatial and time series trend in site solute concentrations. GIS shapefiles can also be overlaid on this plot.
Well Trend plot: For the investigation of historical time-series trends in solute concentrations, groundwater elevation and, if present, NAPL thickness for individual wells. Users can overlay a nonparametric smoother which estimates the time-series trend in solute concentration. The advantage of this nonparametric method is that the trend estimate is not constrained to be monotonic, i.e. the trend can change direction.
Trend and Threshold Indicator Matrix: This feature provides a summary of the level and time series trend in solute concentrations at a particular model output interval.
Plume Diagnostics: New in version 2.1, GWSDAT calculates plume metrics quantifying and reporting temporal plume evolution. The quantities of plume mass, average concentration, area, and location of the centre of mass are calculated by spatial integration of the plume concentrations above a predefined concentration threshold. Further details can be found in the GWSDAT user manual and references therein.