Remote sensing and GIS based determination of groundwater dependent ecosystems in the Western Cape, South Africa |
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| Authors: | Zahn Münch Julian Conrad |
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| Institution: | (1) GEOSS-Geohydrological and Spatial Solutions International (Pty) Ltd, P.O. Box 12412, Die Boord, Stellenbosch, 7613, South Africa |
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| Abstract: | Finding the location of groundwater dependent ecosystems (GDEs) is important in determining the extent of restrictions that
need to be placed upon the abstraction of groundwater. Remote sensing was combined with geographical information system (GIS)
modelling to produce a GDE probability rating map for the Sandveld region, South Africa. Landsat TM imagery identified the
areas indicating the probable presence of GDEs and GIS assisted in their delineation. Three GIS models were generated: a GIS
model predicting landscape wetness potential (LWP model) based on terrain morphological features; the LWP model was modified
to highlight groundwater generated landscape wetness potential (the resulting GglWP model); and a groundwater elevation model
was interpolated, combining groundwater level measurements in boreholes in the region with digital elevation model data. Biomass
indicators generated from Landsat were classified and combined with the GIS models, followed by field verification of riverine
and wetland GDEs. The LWP model provided the most accurate results of the three models tested for GDEs in this region.
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| Keywords: | Remote sensing Geographical information systems Groundwater dependent ecosystems Groundwater management Sandveld region |
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