Design of microirrigation laterals on nonuniform slopes |
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| Authors: | Y Kang Soichi Nishiyama Hesheng Chen |
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| Institution: | (1) Lanzhou Institute of Desert Research, Chinese Academy of Sciences; United Graduate School of Agricultural Science (Ehime University), Faculty of Agriculture, Kagawa University, Miki-Cho, Kagawa-Ken 761-07, Japan, JP;(2) Faculty of Agriculture, Kagawa University, Miki-Cho, Kagawa-Ken 761-07, Japan, JP;(3) Taihu Lake Basin Authority, Ministry of Water Resources, Yixian Road, Shanghai, China, CN |
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| Abstract: | A method for designing microirrigation laterals on nonuniform slopes was developed using the finite element method. Six representative
nonuniform slope patterns were discussed in detail. The design principle was implemented based on the results of computer
simulations. It was found that a single lateral is suitable for Pattern I while paired laterals are better for Patterns II
∼ VI in most cases. The diameter of a single lateral or paired laterals may have two solutions for a required uniformity of
water application and the length may have multiple solutions. When the required average emitter discharge, required uniformity
of water application, and one parameter (either length or diameter) of a single lateral or paired laterals are given, the
unknown parameter, best submain position (paired laterals) and operating pressure head can be accurately designed using personal
computers. The design procedures are described.
Received: 2 November 1995 |
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| Keywords: | Microirrigation lateral Design Nonuniform slopes Finite element method Golden section search |
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