Optimal design of pipe networks for microirrigation system
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Date
2013-12
Authors
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Publisher
G.B. Pant University of Agriculture and Technology, Pantnagar-263145 (Uttarakhand)
Abstract
Microirrigation is one of the latest innovations for applying water and
represents a definite advancement in irrigation technology. The high initial cost is the
major hindrance in popularizing this irrigation system. The main objective of this
study is to develop optimization models for designing different types of pipe networks
of microirrigation subunits. This thesis presents the developments of optimization
models to design pipe networks of single size single lateral and manifold, two pipe
sizes single lateral and manifold, single size paired laterals and manifolds, two pipe
sizes paired laterals and manifolds along with submain and mainline. The pipeline
hydraulics and economic parameters related to the annual energy cost of operating the
system have been incorporated in the models by using appropriate formulae. Linear
and nonlinear optimization models have been developed for designing pipe networks
of microirrigation subunits. The objective functions are formulated to minimize the
total annual cost per unit area formed by laterals and manifold of a subunit. The
optimization models design the fixed and computed subunit sizes along with corner
and central feeding of manifolds by imposing appropriate constraints of lengths,
allowable pressure head variation, conservation of energy and non-negative. The
sensitivity analyses for time of irrigation, irrigation interval, emitter discharge,
emission uniformity, allowable pressure head variation, slope of the land and number
of subunit were carried out to see the effect on optimal solution of the design. The
enumeration method was used to check the validity and efficiency of the developed
optimization model. The applicability of the developed optimization models is shown
by solving design examples using LINGO solver. The developed optimization models
result in economical and efficient design of pipe networks over enumeration method
and can be easily used for designing pipe networks for any conditions of
microirrigation subunits.
Description
Thesis-PhD
Keywords
microirrigation, irrigation systems, networking, optimization, pipes, economics