Browsing by Subject "evapotranspiration"

Now showing 1 - 3 of 3
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    Modeling Direct Recharge of Surficial Aquifers
    (Water Resources Research Center, University of Minnesota, 1983-04) Knoch, Brian C.; Larson, Curtis L.; Slack, Donald C.
    A one-dimensional, physically-based computer model was developed for predicting direct groundwater recharge. The model was verified using three years of data from an instrumented site in east central Minnesota. Although the processes of infiltration and redistribution during frozen soil periods were not modeled, the model is capable of operating during both frozen and non-frozen soil periods. The model includes submodels for evapotranspiration, soil water extraction, snowmelt, surface depressional storage, infiltration and redistribution. The model predicts water table level and soil moisture. Water extraction may also be modeled. The model predicted both water table levels and soil moisture with reasonable accuracy over the the three year period modeled.
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    South Fork Caspar Creek Understory Evapotranspiration Data - 2019
    (2020-12-04) Hammerschmidt, Shelby R; Dymond, Salli F; sdymond@d.umn.edu; Dymond, Salli F
    This dataset consists of evapotranspiration rates measured from different understory trees, shrubs, and ferns at the Caspar Creek Experimental Watersheds in northern California. Evapotranspiration rates were collected from 5 species at two times (June and July 2019) across five topgraphic positions ranging from streamside up to the ridgetop. Measurement species were located across a range of disturbance severities to test the hypothesis that changing light and water dynamics from different levels of disturbance will affect understory plant water use. Evapotranspiration rates were collected using a hand-made portable rapid ET chamber.
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    Water Flow in Soil in Presence of Soybean Root Sinks
    (Water Resources Research Center, University of Minnesota, 1973-06) Mohan Arya, Lalit
    Water depletion patterns in the 10 to 70 cm soil depth in the root zones of two soybean varieties, 79.648 and Chippewa - 64, and in a bare soil were established on Waukegan loam. Soil hydraulic properties of the soil profile, suction-water content and hydraulic conductivity-suction relationships were determined in the laboratory and supported by field measurements. Following irrigation, proportional contribution of various soil layers to the total water loss showed a downward shift with the growth stage of soybeans. In general, 10-cm layers in the upper horizons contributed a major portion to the total water losses. The contribution of the 10 to 20-cm layer remained above 20 percent while that of the 50 to 60-cm layer accounted for less than 10 percent of the total water loss from the 10 to 70-cm profile. During the early stages of growth the evapotranspiration rate was .64 cm/day which agrees with the pan evaporation rate of .66 cm/day. Soil outside the 10 to 70-cm zone contributed about .2 cm/day towards evapotranspiration. About 55 percent of the soil volume showed root densities of 1.0 to 2.0 cm/cm(3). Generally, root density tended to be higher near the plant rows and between the 25 and 45-cm depths below the surface.