HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (30) Citing Articles via Google Scholar Google Scholar Articles by Vrugt, J. A. Articles by Simunek, J. Search for Related Content PubMed Articles by Vrugt, J. A. Articles by Simunek, J. Agricola Articles by Vrugt, J. A. Articles by Simunek, J. Related Collections Soil Physics Other Grain Crops Soil Models

Calibration of a Two-Dimensional Root Water Uptake Model

J. A. Vrugt^a, J. W. Hopmans^*,b and J. imunek^c

^a Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, The Netherlands, Nieuwe Prinsengracht 130, Amsterdam, 1018 VZ
^b Hydrology Program, Dept. Land, Air and Water Resources (LAWR), University of California, Davis, CA 95616, USA
^c USDA Salinity Laboratory, University of California, Riverside, CA 95207, USA

View larger version (16K): [in a new window]   Fig. 1. Representation of different root water uptake models, Sm(z), with depth.

View larger version (58K): [in a new window]   Fig. 2. Four different configurations of two-dimensional spatial distribution of potential root water uptake, ß(r,z).

View larger version (32K): [in a new window]   Fig. 3. Schematic view of the experimental plot (after Koumanov et al., 1997).

View larger version (17K): [in a new window]   Fig. 4. Soil surface boundary conditions during simulation period (Time 0 corresponds with 13 September).

View larger version (20K): [in a new window]   Fig. 5. Optimized soil water retention and unsaturated hydraulic conductivity curves as obtained by the Simplex Algorithm optimization and measured (,h) using the multistep outflow method from soil cores taken at 30-cm depth at a nearby location and (K,) points, as obtained using the instantaneous profile method at a nearby location for the 30-cm soil depth.

View larger version (43K): [in a new window]   Fig. 6. Optimized spatial distribution of potential transpiration ß(r,z).

View larger version (31K): [in a new window]   Fig. 7. Measured (open circles) and simulated (solid lines) water content values as a function of time across the measured spatial domain of the almond tree (C denotes calibration and V is validation).

View larger version (53K): [in a new window]   Fig. 8. Two-dimensional maps of simulated water content values (m3 m-3) and root water uptake (d-1) at three different times during the experimental period.

View larger version (13K): [in a new window]   Fig. 9. (a) Components of the water balance, (b) Measured versus simulated soil water storage during the monitoring period.