Identifying and characterizing solution conduits in karst aquifers through geospatial (GIS) analysis of porosity from borehole imagery: An example from the Biscayne aquifer, South Florida (USA)
Identifying and characterizing solution conduits in karst aquifers through geospatial (GIS) analysis of porosity from borehole imagery: An example from the Biscayne aquifer, South Florida (USA) Series Title:
Advances in Water Resources
Manda, Alex K.
Gross, Michael R.
Subjects / Keywords:
Karst ( local )
Conduits ( local ) Gis ( local ) Borehole Televiewer ( local ) Biscayne Aquifer (South Florida) ( local ) Geospatial Analysis ( local ) Porosity ( local ) Genre:
serial ( sobekcm )
We apply geospatial analysis to borehole imagery in an effort to develop new techniques to evaluate the spatial distribution and internal structure of karst conduits. Remote sensing software is used to classify a high resolution, digital borehole image of limestone bedrock from the Biscayne aquifer (South Florida, USA) into a binary image divided into cells of rock matrix and pores. Within a GIS, 2D porosity is calculated for a series of rectangular sampling windows placed over the binary image and then plotted as a function of depth. Potential conduits that intersect the borehole are identified as peaks of high porosity. A second GIS technique identifies a conduit as a continuous object that spans the entire borehole width. According to these criteria, geospatial analysis reveals âˆ¼10 discrete conduits along the âˆ¼15 m borehole image. Continuous sampling of the geologic medium intersected by the borehole provides insight into the internal structure of karst aquifers and the evolution of karst features. Most importantly, this pilot study demonstrates that GIS-based techniques are capable of quantifying the depths, dimensions, shapes, apertures and connectivity of potential conduits, physical attributes that impact flow in karst aquifers. Original Version:
Advances in Water Resources, Vol. 29, no. 3 (2006-03).
University of South Florida Library Holding Location:
University of South Florida
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