Experimentally Based Numerical Simulation of the Influence of the Agricultural Subsurface Drainage Pipe Geometric Structure on Drainage Flow

Zhe Wu, Chenyao Guo, Haoyu Yang, Hang Li and Jingwei Wu ()
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Zhe Wu: State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No. 299 BaYi Road, Wuhan 430072, China
Chenyao Guo: State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No. 299 BaYi Road, Wuhan 430072, China
Haoyu Yang: State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No. 299 BaYi Road, Wuhan 430072, China
Hang Li: State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No. 299 BaYi Road, Wuhan 430072, China
Jingwei Wu: State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No. 299 BaYi Road, Wuhan 430072, China

Agriculture, 2022, vol. 12, issue 12, 1-19

Abstract: The geometric structure of corrugated plastic pipes affects performance in agricultural subsurface drainage systems. To explore the influence of pipe geometry on flow field characteristics and the characterization of water movements, we developed a three-dimensional (3D) steady-state subsurface drainage model based on computational fluid dynamics (CFD). An analysis of the CFD and sand tank results indicated that the proposed model can accurately simulate the subsurface drainage process (R 2 = 0.99). The corrugation structure parameters of the drainpipe, including the outside diameter, corrugation valley width and corrugation height, were taken as the objects for this study, and the influence of corrugation parameters on drainage discharge was orthogonally analysed. During drainage, the soil water initially collects in the corrugation valley and then approximately ninety percent of the water flows into the pipe through the bottom perforations; increasing the contact face area between the corrugation valley and soil can increase the flow rate of the drainpipe and the water table height above the pipe, which decreases the intersection position of the pipe and water table. The results of the analysis of the range and variance of the orthogonal experiment showed that the order of the primary and secondary factors influencing the drainage discharge was the outside diameter, corrugation valley width and corrugation height, with the outside diameter being most critical influencing factor.

Keywords: subsurface drainage; corrugated plastic pipe; computational fluid dynamics; hydraulic characteristic; flow rate (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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