Présentations Colloques

    Oral Presentation
    8.06
    Session 8.06: Verification of conceptual patterns and expected natural effects of regional groundwater flow by interpretation of relevant field observations
    Palencia-aguilar Carla
    GROUNDWATER FLOW SYSTEM MODELS AND INTERPRETATION OF VARIABLE INTERACTIONS AT GUASCA MUNICIPALITY IN COLOMBIA
    In order to understand the groundwater flow behavior and interaction with various measurable parameters, the Generalized Watershed Loading Functions model using the STELLA software (ISEE Systems), as well as multiple regression analysis and fittings were implemented. The former provided information about the characteristics of the unsaturated zone, saturated zone and stream discharge, based upon information provided by meteorological stations (HOBO and Campbell), piezometers and divers placed in two zones at Guasca Municipality. The discharge results from the STELLA model were compared to the measured values from 2008 to 2010, after Fourier fittings transformations using MATLAB. The groundwater measured by the piezometers and the calculated by Fourier transformations had R2 of 0.89 for the year 2008, 0.94 for 2009 and 0.99 for 2010. Best fittings on monthly basis were found during rainy season with R2 up to 0.9, worst fittings were obtained for monthly rain values lower than 1.8 mm. Average peak discharges measured and calculated had similar results. For example- for the year 2008 the measured average peak discharge value was 5 m3s-1, while the calculated was 4.27 m3s-1, for 2009 the measured average peak discharge value was 5.01 m3s-1 as compared to 4.94 m3s-1 calculated, and 3.08 m3s-1 measured average peak discharge value for 2010 versus 3.04 m3s-1 calculated.**The Normalized Difference Vegetation Index (NDVI) from MODIS images were studied for the year 2008 and compared with the groundwater conductivity at the selected sites. Results show a relationship between these two variables for the dry and rainy season with R2 greater than 0.8. Groundwater level fluctuations were also analyzed and compared with rain patterns. Multiple regressions show relationships between average groundwater level changes per day and daily rain at various time periods (t, t-1 to t-4) with measured and predicted results with R2 of 0.86 for one site and R2 of 0.98 for the other. **
    Colombia

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