03229cas a2200409 a 4500 20260818094302.0 110908s1981 th uu|m rtt 0| a1eng d .b10028808 AIT Thesis no. AE-81-20 Jayasuriya, L. N. N. A dynamic soil moisture and water balance model Bangkok : Asian Institute of Technology, 1981 65 p. Thesis ; no. AE-81-20 A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1981 A computer based moisture simulation model is developed, taking into account nonhomogeneous soil properties, the effects of the rate of root growth and the effects of soil moisture depletion on evaporation and transpiration. Nonhomogeneous soil properties are taken into account by considering the soil as consisting of a number of soil layers acting in parallel. The growth of the roots is taken to be a function of the time as well as the soil moisture content. In evaluating the actual evaporation and transpiration from that of the potential evaporation and transpiration, the twin effects of the crop canopy as well as of the actual soil moisture contents are considered. Using the soil and meteorological data as input parameters, a computer based moisture simulation model provides daily simulated moisture values as well as quantitatively evaluating the evaporation, transpiration, root depth and drainage. The information obtained from the simulation model is used to test a simple water balance model with two types of root water extraction terms. The simple model paves an easier way to evaluate the response of the model to various sets of input parameters. This simple model gave satisfactory results for nonhomogeneous soil. The calibration of the model is done by data obtained for sorghum grown on an Alfisol, Soil moisture Mathematical models Olesen, Svend Elsnab, Chairperson Apichart Anukularmphai, Examination Committee Christoph, Ing. Fried, Examination Committee Carl Duisberg Gesellschaft, Scholarship Donor Asian Institute of Technology. Thesis ; no. AE-81-20 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B21534 .b10028808 mnait x 241217 2 951012 m a x 2 mnait mnait mnarc 20 40 Barcode : 30050003029187 CREATED : 1994-05-16 RECORD # : i10011602 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003029153 CREATED : 1994-05-16 RECORD # : i10011614 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050120302012 CREATED : 2016-05-26 RECORD # : i12993797 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 32057 32057 0 0 0 0 MAIN MAIN mnait 2026-08-18 10.00 0 AIT Thesis no. AE-81-20 30050003029187 2026-08-18 09:43:03 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 10.00 0 AIT Thesis no. AE-81-20 30050003029153 2026-08-18 09:43:03 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. AE-81-20 30050120302012 2026-08-18 09:43:03 2026-08-18 40