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Evapotranspiration of Two Vegetation Covers in a Shallow Water Table Environment

Department of Civil and Environmental Engineering, University of South Florida, 4202 East Fowler Avenue, ENB 118, Tampa, FL 33620

View larger version (18K): [in a new window]   Fig. 1. Diurnal water table fluctuations in the groundwater discharge area, demonstrating partial water table recovery at night. NGVD, National Geodetic Vertical Datum.

View larger version (225K): [in a new window]   Fig. 2. The EnviroSCAN soil moisture probe being lowered into a PVC access tube.

View larger version (10K): [in a new window]   Fig. 3. Total soil moisture is estimated in two soil columns. The first is in a groundwater recharge area (pasture), and the second is in a groundwater discharge area (forested). In a groundwater discharge area, subsurface flow acts to replenish the total soil moisture in the column, while this flux depletes the soil moisture in a groundwater recharge area.

View larger version (18K): [in a new window]   Fig. 4. Total soil moisture (TSM) versus time in the groundwater discharge area. The subsurface flux is the positive slope of the line between midnight and 0400 h.

View larger version (19K): [in a new window]   Fig. 5. Total soil moisture (TSM) versus time in the groundwater recharge area. The slope of the line between midnight and 0400 h is negative and represents the subsurface flux drained from the soil column.

View larger version (24K): [in a new window]   Fig. 6. Fluctuations in water table and total soil moisture for 5 d. The elevation of the land surface for this well is 23.21 m above National Geodetic Vertical Datum (NGVD).

View larger version (13K): [in a new window]   Fig. 7. Evapotranspiration (ET) estimates for pasture by the pan and total soil moisture (TSM) methods. Data points represent the daily values of ET from both techniques.

View larger version (18K): [in a new window]   Fig. 8. Monthly average of evapotranspiration (ET) daily values in forested (diamonds) and pasture (triangles) areas. The gap in the graph represents a period of missing data. Standard deviations of daily values are also shown in the range limits.