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- W82207610 abstract "Surface storage is one of the main parameters in the volume balance analysis of border and furrow irrigation flows. The author has presented a useful analysis on the variation of the surface shape factor (cry) using a dimensionless form of the KW governing equations. Based on (12), the author has graph ically presented the variation of cry with t* for different values of <X and P2' By doing this, it is shown that cry depends on the infiltration characteristics of soil and the geometry of the chan nel cross section. Though the author mainly provides a theo retical analysis and discussion on the variation of cry, it will be useful to briefly discuss some insights gained on this aspect by the discussers through field trials in Australia. The discussers have monitored a total of 81 furrow irriga tion events at three different field sites, called WP, FS, and HF, in southeastern Australia. Furrows at the WP site are long (941 m) and on cracking clay soil, whereas those at the FS and HF sites are short (59 m and 125 m, respectively), on sandy soil at the FS site, and on sandy clay loam soil at the HF site. All 11 irrigation events at the WP site, five randomly selected events at the FS site, and another five events at the HF site were examined in detail for the variation of cry during irrigation in a given furrow, from one furrow to the next in a given irrigation, and from one irrigation to the next during the season. The furrow cross section at each station along the fur row length before and after each irrigation was measured using a profilometer similar to that described in Walker and Sko gerboe (1987), and the depth of water in the furrow was ob tained from water level probe readings at regular intervals. From these two measurements, the cross-sectional area of flow in the furrow and cr v were calculated. As an example, Fig. 11 shows the variation in cry values for three irrigation events, WPll, FS58, and HF44 (one event from each site), at different advance times. The value of the shape factor for event WPll varies considerably with ad vance times, whereas those for events FS58 and HF44 vary relatively less with advance times. For the WP and HF sites, cry generally increases with advance time, while for the FS site, it decreases. The volume of surface storage when the advance front reaches the end of the furrow, for example, in irrigation event WPll, will be 7.9 m 3 if a theoretical value for ay equal to 0.7" @default.
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- W82207610 date "1998-01-01" @default.
- W82207610 modified "2023-09-27" @default.
- W82207610 title "Volume Balance Irrigation Advance Equation: Variation of Surface Shape Factor" @default.
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