Optimum design of drip irrigation system using microtubes as emitters

Keshtgar, A 2012, Optimum design of drip irrigation system using microtubes as emitters, Masters by Research, Civil, Environmental and Chemical Engineering, RMIT University.


Document type: Thesis
Collection: Theses

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Title Optimum design of drip irrigation system using microtubes as emitters
Author(s) Keshtgar, A
Year 2012
Abstract Drip irrigation is a system in which water is supplied directly to plant roots with a pressure and flow rate to meet the crop water requirement. Clogging and emission non-uniformity, for a long time, have been the major obstacles in the development of drip irrigation. It would be a serious problem in areas with brackish water where the problems of precipitation of calcium carbonate, organic materials and suspended sands are severe. In order to obtain the best emission uniformity (EU) in uneven lands the pressure regulators and pressure compensating emitters (a gadget) have been used. However, pressure compensating emitters tend to be more complex and costly than non-compensating emitters and are not easy to apply. In this study, the possibility of utilizing small diameter pipes approximately 2 to 4 mm called microtubes have been discussed for enhancing the discharge uniformity of the drip irrigation and decreasing the difficulties encountered by those emitters due to clogging and blockage. Microtubes have many advantages compared to other types of emitters in terms of cost and practical applications. As these small size pipes are made of flexible materials can be adjusted in shape and length without difficulty. By adjusting the microtube lengths at different points along the lateral according to energy head developed, an equal outflow can be delivered to evenly spaced plants in the field. Here microtubes act as emitters. The variation of the microtube lengths are done for dissipating the extra heads above a threshold value. This threshold energy head value has been set, at the very last microtube of the end-lateral in a given manifold (or subunit), equal to the frictional and other minor energy heads lost for that minimum length microtube required to reach the plant under consideration.

The results of study show that larger sizes microtubes have higher variation of length, while applying larger flow rates can decrease the length variation along the lateral. Few examples are prepared to demonstrate the drip irrigation design parameters in typical subunit sizes.
Degree Masters by Research
Institution RMIT University
School, Department or Centre Civil, Environmental and Chemical Engineering
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Created: Wed, 19 Sep 2012, 14:30:48 EST by Kelly Duong
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