Spatial Plume Mapping

visualisation

Interpolated concentration surface and plume diagnostics (area, peak, centre of mass).

Data

One sample location per line. Columns can be separated by spaces, commas, semicolons or tabs, so you can paste straight from Excel.

Column	What it is	Example
1. X	Easting, or longitude	150
2. Y	Northing, or latitude	100
3. Concentration	The result at that location	596.6
4. Name(optional)	Borehole or well name, drawn on the map	BH03

A line looks like 150 100 596.6 BH03

For a result below the laboratory limit of reporting, enter it as <LOR, e.g. <0.5.

Drop a CSV or Excel file here, or

Read in your browser and put in the box below. The file itself is not uploaded.

15 location(s) parsed

Show groundwater contours Draw groundwater level contours over the plume, so the figure shows which way it is moving. Opens a box for levels at the same site.

Options

Plume thresholdUnit of measureShown against the results and on the map's colour scale. Distances are in whatever unit the coordinates use.Grid resolutionIDW powerInterpolationSmoothed passes near each measurement; exact passes through every one, which puts a small bullseye around each location.

Limit to data extent Limit the surface to the area the samples cover, rather than extrapolating into the corners of a rectangle.

Paste your sample locations and run the analysis

A concentration heatmap and plume diagnostics will appear here.

What this calculates

Builds a concentration surface from scattered sample locations using inverse distance weighting (IDW), then derives plume diagnostics relative to a threshold: plume area, peak concentration and its location, the concentration-weighted centre of mass, the average concentration inside the plume, and a concentration-area integral. Absolute plume mass additionally requires aquifer thickness and porosity, which this tool does not assume.

Method references

Inverse distance weighting is a standard, transparent deterministic spatial interpolator widely used in environmental site assessment.