Effects of Climatic and Hydraulic Parameters on Water Uniformity Coefficient in Solid Set Systems

“…Several studies have shown that wind velocity is the main constraint for sprinkler irrigation which severely reduces irrigation uniformity and increases evaporation and drift water losses. On the other hand low wind speed conditions guaranteed for high irrigation uniformity (Dechmi et al, 2003b;Kara et al, 2008;Playan et al, 2009;Moazed et al, 2010;Yacoubi et al, 2010) which was also observed in this study. The CU values decreased as the wind speed increased.…”

Section: Impact Of Wind Speed On Water Application Uniformitysupporting

confidence: 83%

Effects of Operating Pressure, Nozzle Diameter and Wind Speed on the Performance of Sprinkler in Irrigation System during Water Application

Nigatie¹,

Dinka

Hordofa

2018

ABC j. adv. res.

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Owing to an increasing demand for irrigation water associated with the massive expansion of irrigated sugarcane farms in Ethiopia, there is a need to use the available water efficiently and effectively. Accordingly, a study was conducted to evaluate the effect of operating pressure and nozzle size on the field performance of dragline sprinkler system at Wonji/Shoa Sugar Estate. The study was conducted under three wind phases (morning, mid-day and late afternoon) using three operating pressures (250 kPa, 300 kPa and 350 kPa) and two nozzle sizes (4.4 and 4.8 mm). Uniformity measurements were performed using single sprinkler and four sprinklers configurations. An application efficiency of low-quarter of 41% to 80.3% and actual application efficiency of low-quarter of 30.1% to 37.5% were achieved under the respective test combinations. Christiansen's coefficient of uniformity of 71.7% to 86.3%, and distribution uniformity of 61% to 80.3% were achieved under different test combinations for four sprinklers test. The achievable delivery performance ratio was in the range of 0.81 to 1.18. The experimental results illustrated that, lower operating pressure and higher wind velocity were the major factors responsible for the low water distribution uniformity and efficiency.

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“…The more uniform the pattern of rainfall is, the closer C u C approaches to 100%. A rainfall can be considered uniform when C u C is higher than 80% (Moazed et al, ). C u C changed from 82% to 89% for rainfall patterns in this study.…”

Section: Methodsmentioning

confidence: 99%

Empirical Sediment Transport Models Based on Indoor Rainfall Simulator and Erosion Flume Experimental Data

2016

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Land degradation processes start with accelerated runoff and sediment delivery. In this study, rainfall‐runoff induced sediment transport is investigated using data from an indoor laboratory experimental setup consisting of a rainfall simulator and an erosion flume. The data are analysed to develop empirical models using sediment discharge, slope, flow discharge, rainfall intensity and sediment size. Fine and medium sands are considered as bare soil in experiments. Four rainfall intensities (45, 65, 85 and 105 mm h−1) are applied with combinations of lateral and longitudinal slopes of 5%, 10%, 15% and 20%. Eighty experiments are conducted. Flow is measured, and sediment within flow is separated and weighted. Experimental data are used for developing empirical models through multiple regression with parameters optimized by genetic algorithm. Results show that slope is the main contributing variable to the sediment transport over hillslopes. Accommodating variables among slope, rainfall intensity, flow discharge and median diameter of sediment as independent variables, one‐variable, two‐variable and four‐variable models are developed considering also that higher number of parameters increases the performance of the model with higher cost of parameterization. Copyright © 2016 John Wiley & Sons, Ltd.

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Effects of Climatic and Hydraulic Parameters on Water Uniformity Coefficient in Solid Set Systems

Cited by 28 publications

References 10 publications

Sprinkler irrigation uniformity and crop water productivity of barley in arid region

Sprinkler irrigation uniformity and crop water productivity of barley in arid region

Effects of Operating Pressure, Nozzle Diameter and Wind Speed on the Performance of Sprinkler in Irrigation System during Water Application

Empirical Sediment Transport Models Based on Indoor Rainfall Simulator and Erosion Flume Experimental Data

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