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- W2041767695 abstract "Empirical descriptions of the furrow cross section are used in many model formulations, often as a means of reducing the number of solution variables (Walker and Skogerboe 1988). One option in the SIRMOD model (SIRMOD 1989) is to identify a general description of the crosssectional shape and input a few descriptive dimensions. Another option allows the user to input externally calculated empirical parameters to define the cross section. The SRFR model (Strelkoff 1993) allows the user to define a symmetric trapezoid, or to enter externally calculated parameters that define the relationship between flow depth and flow top width. The SRFR model also has provisions for submerged furrows, as happens occasionally with blocked ends. in which the cross section above the submerged furrow is rectangular with a width equal to the wetted furrow spacing. Mandel (1993) used a relationship between flow depth and cross-sectional area as part of a technique for the analysis of blocked-end sloping-furrow irrigation field trials. A similar relationship can be used to assist in measuring the cross-sectional flow area required to determine infiltration characteristics, using the technique of Smerdon et al. (1988). There are a variety of techniques for measuring cross-sectional data in the field. Walker (1989) and Cahoon (1989) described simple profilometers with sliding rods. which could be used to measure furrow depth versus position. Profilometers of these types were used in a variety of configurations; Mandel (1993), for example. Kechrid et al. (1991) presented the results of field trials in which furrow irrigation evaluations were performed on furrows of different shapes. imposed by mechanical tillage devices. In a detailed analysis, Trout (1991) compared the use of rigid and constant shape descriptions of furrow cross sections. The objective of this paper is to outline techniques for using observed cross-sectional measurements, to arrive at descriptions of a rigid furrow cross section, which are consistent with many of the currently available furrow irrigation models." @default.
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- W2041767695 date "1995-01-01" @default.
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- W2041767695 title "Defining Furrow Cross Section" @default.
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- W2041767695 doi "https://doi.org/10.1061/(asce)0733-9437(1995)121:1(114)" @default.
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