Simplified calculation method and its validation of infiltration capacity for film hole irrigation

doi:10.11975/j.issn.1002-6819.2016.13.010

	Simplified calculation method and its validation of infiltration capacity for film hole irrigation
	Fan, Yanwei; Zhao, Tong; Zhao, Wenju; Bi, Guiquan
刊名	农业工程学报
	2016-07-01
卷号	32 期号:13 页码:67-74
关键词	Infiltration Hydraulic conductivity Irrigation Moisture Moisture determination Numerical analysis Soils Water Film hole irrigation Film holes Infiltration characteristic Infiltration coefficients Parameter Saturated hydraulic conductivity Simplified calculation method Undetermined coefficients
ISSN号	1002-6819
DOI	10.11975/j.issn.1002-6819.2016.13.010
其他题名	膜孔灌灌溉入渗量的简化计算方法及验证
文献子类	Article
英文摘要	In order to simplify the numerical calculation of cumulative infiltration capacity under film hole irrigation, the film hole cumulative infiltration was decomposed into vertical infiltration capacity and lateral infiltration capacity, and lateral infiltration capacity of unit film hole perimeter was introduced to calculate film hole lateral infiltration capacity. The soil vertical one-dimensional infiltration characteristics and film hole infiltration characteristics were simulated by using HYDRUS-1D/3D software. According to the simulation results, the influence of film hole diameter on lateral infiltration capacity of unit film hole perimeter was analyzed. It was found that the film hole diameter had little impact on lateral infiltration capacity of unit film hole perimeter, and its impact on lateral infiltration capacity of unit film hole perimeter could be ignored. At present, the influence factors of one dimensional infiltration and film hole diameter on lateral infiltration capacity of unit film hole perimeter was the soil texture, initial moisture content and irrigation water depth. Based on this, the vertical one-dimensional infiltration depth and lateral infiltration capacity of unit film hole perimeter were quantitatively analyzed by using Philip infiltration model, and the influence of soil texture, initial moisture content and irrigation water depth on lateral infiltration coefficient and vertical one-dimensional infiltration coefficient were studied. The results showed that the soil texture had large impact on both the relative sorptivity rate(the ratio of sorptivity rate of lateral infiltration capacity of unit film hole perimeter to sorptivity rate of vertical one dimensional infiltration) and the relative steady infiltration rate(the ratio of steady infiltration rate of lateral infiltration capacity of unit film hole perimeter to steady infiltration rate of vertical one dimensional infiltration), the relative sorptivity rate decreased slightly with the increase of initial moisture content, the decrease amplitude of the relative sorptivity rate was 5.49%-24.72%, and irrigation water depth had less influence on relative steady infiltration rate, the maximum amplitude of the relative steady infiltration rate change was 21.80%. With respect to the relative steady infiltration rate, the change of relative sorptivity rate had less impact on cumulative infiltration capacity under film hole irrigation, to simplify the calculation, the relative sorptivity rate was considered as a fixed value for the same soil texture. The relative steady infiltration rate increased with the increase of irrigation water depth, the increase amplitude of the relative steady infiltration rate was 2.55%-42.76%, and the initial moisture content had little influence on relative steady infiltration rate, and the maximum amplitude of the relative steady infiltration rate change was 2.94%. To simplify the calculation of cumulative infiltration under film hole irrigation, only irrigation water depth was considered for its effect on the relative steady infiltration rate. The relationship between vertical infiltration coefficient and lateral infiltration coefficient was established. The simplified calculating model for cumulative infiltration capacity of film hole irrigation was proposed, including the film hole diameter, irrigation water depth, sorptivity of vertical one-dimensional infiltration and soil saturated hydraulic conductivity. The film hole infiltration parameters could be determined by using one-dimensional vertical infiltration parameters. The model was verified by infiltration experiments of one-dimensional vertical infiltration, experiments of film hole infiltration and the other researcher's experiment results. The results showed that the calculated values of experimental equation were consistent with the measured values(R2≥0.995, P<0.001), and the average relative error was about 5%(4.84%~6.81%). The equation proposed here only have 2 undetermined coefficients: vertical one-dimensional infiltration characteristics and film hole infiltration characteristics. It was simple enough for accurately predicting film hole infiltration characteristics. © 2016, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.
学科主题	Soils And Soil Mechanics ; Agricultural Methods
出版地	Beijing
语种	中文
CSCD记录号	CSCD:5736972
内容类型	期刊论文
源URL	[http://ir.lzu.edu.cn/handle/262010/182540]
专题	土木工程与力学学院_期刊论文
推荐引用方式 GB/T 7714	Fan, Yanwei,Zhao, Tong,Zhao, Wenju,et al. Simplified calculation method and its validation of infiltration capacity for film hole irrigation[J]. 农业工程学报,2016,32(13):67-74.
APA	Fan, Yanwei,Zhao, Tong,Zhao, Wenju,&Bi, Guiquan.(2016).Simplified calculation method and its validation of infiltration capacity for film hole irrigation.农业工程学报,32(13),67-74.
MLA	Fan, Yanwei,et al."Simplified calculation method and its validation of infiltration capacity for film hole irrigation".农业工程学报 32.13(2016):67-74.