Your search found 8 records
1 Chu, S. T.; Bagherzadeh, H. M. 1992. Constant hole spacing trail tubes. Journal of Irrigation and Drainage Engineering, 118(1):166-178.
(Location: IWMI-HQ Call no: PER Record No: H09918)
2 Chu, S. T.. 1992. Vadose zone composite hydraulic conductivity. Journal of Irrigation and Drainage Engineering, 118(5):822-827.
(Location: IWMI-HQ Call no: PER Record No: H011302)
3 Chu, S. T.. 1993. Capillary-tube infiltration model. Journal of Irrigation and Drainage Engineering, 119(3):514-521.
(Location: IWMI-HQ Call no: PER Record No: H012851)
The concept of treating soil matrix as a bundle of capillary tubes was used extensively in the analytical description of hydraulic conductivity of unsaturated soils. Such a concept has seldom been used in the development of infiltration models. The advantage of considering soil matrix as a collection of capillary tubes is that the water flow in large tubes can be separated from the flow in small tubes. Such a separation is desirable in the study of soil macropore flow where the flow in large pores is primarily responsible for ground-water contamination and recharge. The purpose of this paper is to derive an infiltration model based on the concept of a bundle of capillary tubes for the study of soil macropore flow. The model presented a spatially varied wetting front and was an improvement over the Green-Ampt infiltration model, which predicted a constant depth front. The soil macropore flow was represented graphically as a finger on a depth-water content plot.
4 Chu, S. T.. 1986. Determination of green-ampt parameters using a sprinkler infiltrometer. In American Society of Agricultural Engineers, Transactions of the ASAE: Special edition - Soil and Water, Vol.29. St. Joseph, MI, USA: ASAE. pp.501-504.
(Location: IWMI-HQ Call no: 631.4 G000 AME Record No: H013848)
5 Chu, S. T.. 1994. Green-ampt analysis of wetting patterns for surface emitters. Journal of Irrigation and Drainage Engineering, 120(2):414-421.
(Location: IWMI-HQ Call no: PER Record No: H014099)
A three-dimensional Green-Ampt analysis is developed, and the infiltration capacity curve for a three-dimensional infiltration model is presented. The infiltration-capacity curve represents the time distribution of wetting- pattern volume of a water source with unlimited inflow supply. A significant feature of the infiltration-capacity curve is that the infiltration-capacity rate increases with time during extended infiltration periods. This feature is different from the one-dimensional infiltration model where the infiltration-capacity rate decreases with time. The infiltration-capacity curve is applied to describe the wetting pattern of a surface emitter with a constant discharge by matching the emitter discharge with the average infiltration-capacity rate. Algebraic solutions of the wetted radius and the maximum wetting-pattern depth are derived. Graphical solutions of the infiltration-capacity curve are presented. A numerical example is prepared to illustrate the procedure for estimating time application, wetting pattern volume, emitter discharge, and irrigation period of a surface emitter in a drip-irrigation system.
6 Chu, S. T.. 1994. Transient radius of influence model. Journal of Irrigation and Drainage Engineering, 120(5):964-969.
(Location: IWMI-HQ Call no: PER Record No: H015376)
7 Li, Y.; Chu, S. T.. 1995. Field evaluation of aquifer-recharge model. Journal of Irrigation and Drainage Engineering, 121(6):385-389.
(Location: IWMI-HQ Call no: PER Record No: H017613)
8 DeBoer, D. W.; Chu, S. T.. 2001. Sprinkler technologies, soil infiltration, and runoff. Journal of Irrigation and Drainage Engineering, 127(4):234-239.
(Location: IWMI-HQ Call no: PER Record No: H028742)
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