Method for irrigating farmland

US11300430B2 · kind B2 · utility

Assignee

• China Institute of Water Resources and Hydropower Research · CN

Inventors

• Shaohui Zhang · Beijing, CN
• Di Xu · Baltimore, US
• Wei Dai · Beijing, CN
• Meijian Bai · Beijing, CN
• Qunchang Liu · Beijing, CN
• Fuxiang Li · Zhejiang, CN

Key dates

• Filing date: Jun 30, 2016
• Grant date: Apr 12, 2022
• Expiry date: Nov 28, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F23/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for acquiring a canal flow rate, comprising: measuring an actual measure value of an upstream water depth and an actual measure value of a downstream water depth of a target canal; presetting the upstream canal flow rate and surface water infiltration rate of the target canal, and respectively acquiring preset values of each; substituting the actual measured value of the upstream water depth, the preset value of the upstream canal flow rate, and the preset value of the surface water infiltration rate into Saint-Venant equations, so as to solve the equations and obtain a downstream water depth simulation value of the target canal; when the relative error between the downstream water depth simulation value and the actual measured value of the downstream water depth is less than or equal to the preset threshold value, acquiring a viable upstream canal flow rate and a viable surface water infiltration rate; otherwise, optimizing the preset value of the upstream canal flow rate and the preset value of the surface water infiltration rate, and repeating the described process until the relative error between the two is less than or equal to the preset threshold value, so as to acq…