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GIS-BASED COUPLING OF GLEAMS AND REMM HYDROLOGY: I. DEVELOPMENT AND SENSITIVITY

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Transactions of the ASAE.  VOL. 43(6): 1525-1534 . (doi: 10.13031/2013.3052) @2000
Authors:   M. A. Tucker, D. L. Thomas, D. D. Bosch, G. Vellidis
Keywords:   Hydrologic modeling, Water table, Hydrology, Runoff, Hydraulic conductivity.

Movement of water from agricultural fields and into adjacent riparian areas is an important process in minimizing pollution for a large percentage of agricultural lands. Models have been developed for upland agricultural areas and for riparian zones. Creating a flexible structure for linking two different models is both desirable and needed for complete analysis of the systems. Since water is the primary mechanism for pollutant transport, creating a system which manages both surface and subsurface water movement is a first priority. An integrated model system was developed for joining the hydrologic portions of GLEAMS and REMM in a cascaded format to determine the fate of surface and subsurface water leaving an upland cultivated area and traversing a riparian forest. Data was managed within a GIS to aid in inputting and manipulating both spatial and nonspatial model parameters. Transfer of subsurface flow from the upland model to the riparian model was achieved through Darcys equation. Partitioning of the flow was based on the hydraulic conductivity of the different layers and the depth of the water table. The model system was able to account for saturated zones encountered in the riparian area by raising the water table. The model system responded as would be expected under relatively extreme changes in precipitation for both shallow groundwater levels and runoff. The model system also exhibited expected behavior under different leaf area index (LAI) parameters within the forest. The shallow groundwater levels and runoff were not drastically affected, but the levels of response were within the range of expectations.

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