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ARS Home » Northeast Area » University Park, Pennsylvania » Pasture Systems & Watershed Management Research » Research » Publications at this Location » Publication #35305

Title: CONDITIONAL SIMULATION OF PERCOLATE FLUX BELOW A ROOTZONE

Author
item Rogowski A S

Submitted to: Environmental Modeling International Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 12/5/1993
Publication Date: N/A
Citation: N/A

Interpretive Summary: Not required

Technical Abstract: A multiple indicator conditional simulation program (ISIM3) and a raster based geographic information system (GIS-IDRISI) were used to construct overlays of percolate flux below a rootzone. The approach called for a substitution of conditionally simulated values of hydraulic conductivity (K) into a simplified gravity flow equation to give spatial estimates of flux below a rootzone. These estimates were subsequently used to construc quantity-arrival-time distributions of recharge flux at the watertable. The procedure is illustrated with an example from a Pennsylvania watershed. Sampling positions, where soil K was measured with a Guelph permeameter, were identified in the field with a global positioning system (GPS), while GIS modeling was utilized to manipulate, combine, and display the spatial flow properties. Conditional simulation of flow parameters, when coupled with currently available GIS and GPS technology, appeared to successfully account for spatial variation of field measured soil attributes and helped to identify potential groundwater recharge zones within a watershed.