A simple model for predicting soil infiltration rate for vertical line source irrigation

doi:10.1088/1755-1315/569/1/012068

	A simple model for predicting soil infiltration rate for vertical line source irrigation
	Wang, Ying 2; Gong, Jiaguo 2; Fan, Yanwei 1
	2020-09-24
会议日期	July 18, 2020 - July 20, 2020
会议地点	Chengdu, China
关键词	Efficiency Geology Irrigation Mean square error Soil moisture Textures VLSI circuits Efficiency coefficient Experimental scheme Influential factors Initial water contents Laboratory experiments Root mean square errors Steady infiltration rate Vertical line source
卷号	569
期号	1
DOI	10.1088/1755-1315/569/1/012068
英文摘要	In this study, HYDRUS-2D was used to simulate the soil infiltration rate of vertical line source irrigation (VLSI) under different soil textures and initial water contents, as well as for different lengths, diameters and buried depths of the line source. The soil texture, diameter and length of the line source are the dominant influential factors of the soil infiltration rate of VLSI, whereas the initial water content and buried depth of the line source are less influential. The variation of soil infiltration rate is in accordance with the Philip model. The model parameters, i.e., sorptivity (S) and steady infiltration rate (A), increase as the diameter (D) and length (L) of line source increases. A power function between S and D and L, and one between A and D and L, were established. The exponential value of the power function was determined based on the HYDRUS simulation results, thereby obtaining a simplified estimation model of the soil infiltration rate of VLSI containing D and L. The effectiveness of the simplified model was verified based on a laboratory experiment and currently available research. The MAE (mean absolute error, MAE) is 0.056-0.348, RMSE (Root mean square error, RMSE) is 0.073-0.442, PBIAS (percentage bias, PBIAS) is 1.642-2.893, and NSE (Nash-Sutcliffe efficiency coefficient, NSE) is close to 1 (NSE≥0.973), indicating that the model has a high accuracy and can therefore be used for estimating the soil infiltration rate of VLSI. The simplified estimation model established in this study has only two undetermined parameters that can be obtained based on only one set of experimental data, simplifying the experimental scheme and improving the work efficiency. © 2020 Institute of Physics Publishing. All rights reserved.
会议录	IOP Conference Series: Earth and Environmental Science
会议录出版者	IOP Publishing Ltd
语种	英语
ISSN号	17551307
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/118185]
专题	能源与动力工程学院
作者单位	1.College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China 2.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing; 100038, China;
推荐引用方式 GB/T 7714	Wang, Ying,Gong, Jiaguo,Fan, Yanwei. A simple model for predicting soil infiltration rate for vertical line source irrigation[C]. 见:. Chengdu, China. July 18, 2020 - July 20, 2020.