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D. Zerihun
University of Arizona
EngineeringGeotechnical engineeringHydrologySurface irrigationIrrigation
35Publications
7H-index
205Citations
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Publications 36
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This is the third manuscript of a three-part paper that presents the development and evaluation of a hydraulic simulation model for linear-move laterals equipped with pressure reducing valve (prvs). System description, model assumptions, and specification of the lateral hydraulic simulation problem are discussed in part-one of the paper. Formulation and numerical solution of the lateral hydraulic simulation problem are described in manuscript-two. Results of model evaluation and simulation examp...
This manuscript presents a hydraulic simulation model for linear-move sprinkler irrigation laterals equipped with pressure reducing valves (prvs). The linear-move lateral considered here consists of a series of arched spans with a specified geometry and multiple outlet-ports. Lateral diameter, hydraulic resistance characteristics, field slope, spacing between outlets, and sprinkler hydraulic characteristics can be constant or variable along a lateral. Lowpressure sprinklers, or spray nozzles, co...
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#1D. Zerihun (UA: University of Arizona)H-Index: 7
#2Charles A Sanchez (UA: University of Arizona)H-Index: 24
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In modern farming systems, fertigation is widely practiced as a cost effective and convenient method for applying soluble fertilizers to crops. Along with efficiency and adequacy, uniformity is an important fertigation performance evaluation criterion. Fertigation uniformity is defined here as a composite parameter consisting of irrigation and fertilizer application uniformity indicators. The field and computational procedures for sprinkler irrigation uniformity evaluation have been the subject ...
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#1D. Zerihun (UA: University of Arizona)H-Index: 7
#2Charles A Sanchez (UA: University of Arizona)H-Index: 24
Last. Arthur W. Warrick (UA: University of Arizona)H-Index: 28
view all 3 authors...
AbstractDroplet dynamics simulations are key to predicting sprinkler irrigation precipitation patterns. This paper includes derivations of equations describing droplet motion through a steady, uniform horizontal airflow (wind). The assumptions on which sprinkler irrigation droplet dynamics is based are stated, and the limitations they entail are highlighted. The motion of droplets is treated as an impulsively started accelerated motion of rigid spheres, originating at the sprinkler nozzle with k...
4 CitationsSource
#1D. Zerihun (UA: University of Arizona)H-Index: 7
#2Charles A Sanchez (UA: University of Arizona)H-Index: 24
Last. Arthur W. Warrick (UA: University of Arizona)H-Index: 28
view all 3 authors...
AbstractA system of equations, with strong physical basis, was derived for sprinkler irrigation droplet dynamics in the companion paper. Numerical solution of these equations and model evaluation is discussed in this paper. With the aim of enhancing computational efficiency and robustness, the droplet dynamics equations were scaled using four characteristic variables: characteristic time, length, velocity, and density. The characteristic time, length, and velocity are derived based on considerat...
1 CitationsSource
#1D. Zerihun (UA: University of Arizona)H-Index: 7
#2Charles A Sanchez (UA: University of Arizona)H-Index: 24
Source
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