排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2013, Vol. 31 Issue (4): 340-344    DOI: 10.3969/j.issn.1674-8530.2013.04.013
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Calculation method of the maximum flow variation and evaluation of factors for microirrigation engineering
 ZHU  De-Lan, WU  Pu-Te, ZHANG  Lin
(Institute of Water Saving Agriculture of China, Northwest A&F University, Yangling, Shaanxi 712100, China)
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Abstract The distribution characteristic of emitters′ flow coefficient is analyzed. When flow coefficient complies with normal distribution, the probability of flow coefficient fluctuating at ±3 times standard deviations is 9973% (approximating 100%). Thus, the minimum flow coefficient is average flow coefficient minus 3 times standard deviation and the maximum flow coefficient is average flow coefficient plus 3 times standard deviation. Based on the above analysis, a comprehensive flow variation rate calculation formula, taking hydraulic variation, manufacture variation and microterrain variation into consideration, is presented. Then, with emitter manufacturing variation coefficient, flow exponent, pressure difference and average field roughness height as influential factors, flow variation rate and lateral cost sensitivity were analyzed. The results show that emitter manufacturing variation coefficient is the most influential factor, followed by flow exponent and pressure difference. The lateral cost increases dramatically when manufacturing variation coefficient is larger than 004. In designing, emitters with minimal manufacture variation and minimal flow exponent should be elected. For normal drip irrigation systems, when the emitter′s waterdrop is larger than 10m, the effects of local height differences in fields on flow variation can be ignored.
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ZHU De-Lan
WU Pu-Te
ZHANG Lin
Key wordsemitters   flow coefficient   flow variation rate   emitter manufacturing variation coefficient   flow exponent     
Received: 2012-07-04; Published: 2013-04-30
Cite this article:   
ZHU De-Lan,WU Pu-Te,ZHANG Lin. Calculation method of the maximum flow variation and evaluation of factors for microirrigation engineering[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(4): 340-344.
 
[1] 朱德兰, 吴普特, 王剑.滴头制造偏差对灌水均匀度及毛管造价的影响[J]. 排灌机械工程学报, 2010,29(2): 175-179.
Zhu Delan, Wu Pute, Wang Jian. Effect of emitters manufacturing variation of microirrigationon uniformity and lateral cost[J].Journal of Drainage and Irrigation Machinery Engineering, 2010,29(2): 175-179.(in Chinese)
[2] 王洪源, 李光永. 滴灌模式和灌水下限对甜瓜耗水量和产量的影响 [J]. 农业机械学报, 2010, 41(5): 47-51.
Wang Hongyuan,Li Guangyong. Effect of drip irrigation model and irrigation start point on water consumption and yield of sweet melon[J]. Transactions of the Chinese Society for Agricultural Machinery, 2010, 41(5): 47-51.(in Chinese)
[3] 翟国亮,陈刚,鞠花,等. 全补偿微灌系统灌水均匀度参数之间的关系分析[J]. 农业工程学报, 2007,23(6): 61-65.
Zhai Guoliang,Chen Gang, Ju Hua,et al. Analysis of relationships among different parameters of irrigation uniformity in fullycompensated microirrigation system [J]. Transactions of the CSAE, 2007,23(6): 61-65. (in Chinese)
[4] Keller J, Bliesner R D. Sprinkler and Trickle Irrigation [M]. New Jersey: The Blackburn Press, 1990.
[5] Juana J,Leonor R S. Evaluation of drip irrigation: Selection of emitters and hydraulic characterization of trapezoidal units [J]. Agricultural Water Management, 2007, 90(1): 12-26.
[6] Yildirim G. Analytical relationships for designing multiple outlets pipeline [J]. J Irrig Drain Eng,2007, 133(2):140-155.
[7] Bralts V F,Wu I P, Gitlin H M. Manufacturing variation and drip irrigation uniformity [J]. Transactions of the ASAE, 1981, 24(1): 113-119.
[8] 张国祥.用凯勒均匀度进行微灌系统设计的质疑[J].农业工程学报, 2009, 25(8): 6-10.
Zhang Guoxiang. Query about microirrigation system design using Keller Uniformity [J]. Transactions of the CSAE, 2009, 25(8): 6-10.(in Chinese)
[9] Bralts V F.The effects of emitter flow variation on the design of single and dual chamber drip irrigation systems[D].Honolulu:University of Hawaii,1978.
[10] Zhu D L,Wu P T,Merkley G P,et al. Drip irrigation lateral design procedure based on emission uniformity and field microtopography [J]. Irrigation and Drainage, 2010, 59(5):535-546.
[11] Zhang Guoxiang. Calculating the total flow deviation rate of drip irrigation system based on three deviationrates [J]. Transactions of the CSAE, 2006, 22(11): 27-29. (in Chinese)
[12] 张国祥, 吴普特. 滴灌系统滴头设计水头的取值依据[J].农业工程学报, 2005, 21 (9): 20-22.
Zhang Guoxiang,Wu Pute. Determination of the design working head of emitter[J].Transactions of the CSAE, 2005, 21(9): 20-22. (in Chinese)
[13] Wu P T, Zhu D L, Jin J, et al. Design of drip irrigation lateral for optimum capital and operating cost [J]. Water Science and Technology, 2010, 10(6): 943-951.
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