Improving drip irrigation uniformity by boosting the hydraulic performance of drip lateral pressure regulators  

作　　者：Xiaoran Wang Chen Zhang Guangyong Li 

机构地区：[1]School of Engineering,the Open University of China,Beijing 100039,China [2]College of Water Resources&Civil Engineering,China Agricultural University,Beijing 100083,China [3]Institute of Water Resources for Pastoral Area,Ministry of Water Resources of the PR China,Hohhot 010020,China

出　　处：《International Journal of Agricultural and Biological Engineering》2024年第6期185-192,共8页国际农业与生物工程学报(英文)

基　　金：financially supported by China Institute of Water Resources and Hydropower Research(Grant No.MK2021J10);China Agriculture Research System of MOF and MARA(Grant No.CARS-03-43);The Open University of China Youth Research Project:Research of the synergistic control mechanism of microirrigation submain and lateral pressure/flow regulator(Grant No.Q23A0009).

摘　　要：Compared with the use of expensive pressure-compensating drip tapes,installing pressure regulators(PRs)at the inlet of cost-effective non-pressure-compensating drip tapes is obviously a more economical technology to achieve precision agriculture.However,most drip lateral PRs may not meet the requirements of the design and use of complex drip irrigation systems(hilly or large-scale systems),and there is seldom research on their application in drip irrigation systems,both restricting the promotion of this precision agriculture technology.In this paper,two types of PRs(A-and B-type)for complex drip irrigation systems are proposed,and compared with two conventional PRs(C-and D-type)under 9 different pressure and flow conditions of the drip irrigation system.The main advantage of A-and B-type PRs over conventional PRs is that their outlet pressures are scarcely affected by inlet pressure and flow.Therefore,A-and B-type PRs not only cope with large submain pressure differences,but also guarantee irrigation uniformity CU up to 90%in drip irrigation systems with different drip-tape lengths(flow range:350-1400 L/h),while CU can be lower than 80%under the same conditions without PRs or using conventional PRs.When designing drip irrigation systems,the use of A-and B-type PRs can allocate greater pressure deviation to the laterals(h_(v2))to increase the lateral laying length,thus further reducing pipeline network investment.Under the requirements of maximum pressure deviation hv≤40%and submain pressure deviation hv1≤20%,the results of h_(v2) with A-,B-,C-,and D-type PRs were 30%-35%,30%-37%,33%-35%,and 21%-27%,respectively.This research provides a device and method that can improve the irrigation uniformity of drip irrigation systems across a wider application range.Based on this research,users can reasonably select the PRs according to different design standards,significantly enhancing the irrigation uniformity of the system in a cost-effective manner.

关 键 词：MICROIRRIGATION pressure regulator engineering application irrigation uniformity drip tape 

分 类 号：S27[农业科学—农业水土工程]