利用winSRFR模拟畦灌入渗参数和灌水质量变化规律  

Using WinSRFR to Simulate Water flow and Infiltration under Border Irrigation

作　　者：刘洋 孙秀路[1] 孙浩 李金山[1] LIU Yang;SUN Xiulu;SUN Hao;LI Jinshan(Farmland Irrigation Research Institute,Chinese Academy of Agricultural Sciences,Key Laboratory of Water-saving Agriculture of Henan Province,Key Laboratory of Water-saving Irrigation Engineering of Ministry of Agriculture and Rural Affairs,Xinxiang 453002,China;Graduate School of Chinese Academy of Agricultural Sciences,Beijing 100081,China)

机构地区：[1]中国农业科学院农田灌溉研究所/河南省节水农业重点实验室/农业农村部节水灌溉工程重点实验室,河南新乡453002 [2]中国农业科学院研究生院,北京100081

出　　处：《灌溉排水学报》2021年第6期88-93,共6页Journal of Irrigation and Drainage

基　　金：国家重点研发计划课题(2017YFC0403204);中央级公益性科研院所基本科研业务费专项(Y2020PT15);中国农业科学院科技创新工程项目。

摘　　要：【目的】探究畦灌入渗参数及灌水质量变化规律及其与灌水历时的关系。【方法】基于夏玉米-冬小麦轮作实测数据,采用winSRFR模型模拟灌水过程,计算入渗参数和灌水均匀度。【结果】水流推进与消退均方根误差介于0.05~0.41 h和0.06~0.71 h,占推进和消退时间1.23%~7.16%和1.21%~23.37%;冬小麦水流推进速率明显慢于夏玉米,平均多用时123.99%,冬小麦时期的土壤入渗系数较夏玉米时期平均增大1.05倍,土壤入渗指数较夏玉米时期平均小34.61%,糙率较夏玉米平均增大39.31%;通过拟合,入渗系数与灌水历时呈线性关系(R2=0.9036),可用于入渗系数估算。【结论】winSRFR模型模拟效果较好,随灌水次数增加,入渗系数和入渗指数均减小,地表入渗能力降低,有利于提升灌水质量,入渗系数与灌水历时呈线性关系。【Objective】Water flows over the soil surface and its infiltration in soil are two important parameters for irrigation design,and they are modulated by a multitude of biotic and abiotic factors.The aim of this paper is to investigate the advance and recession of water over the soil surface,as well as its infiltration in soil under border irrigation in attempts to provide a guidance to help border irrigation design.【Method】The analysis was based on both experiment and numerical simulation.A field experiment was conducted in borders grown with rotated maize and winter wheat.In the experiment,we measured spatiotemporal changes in both soil water and advance and recession of surface water inside the borders.The experimental data were used to calibrate and test the WinSRFR model to simulate water flows.【Result】The numerical model correctly reproduced water flow in both soil and over the soil surface,with the root mean square errors for advance and recession of the surface water in the border ranging from 0.05 to 0.41 h and 0.06 to 0.71 h,respectively,which accounted for 1.23%~7.16%and 1.21%~23.37%of the advancing and recessing time respectively.Crop type affected water flows,and water advancing speed over the soil surface in irrigating the winter wheat was 23.99%slower than irrigating the summer maize.Compared with the summer maize,the winter wheat increased soil water infiltration coefficient and surface roughness by 5%and 39.1%respectively,while reducing soil infiltration index by 34.61%.Curve fitting revealed that the infiltration coefficient was linearly related to the irrigation duration with R2=0.9036.【Conclusion】The WinSRFR model was accurate to simulate water flow over the soil surface and its infiltration under border irrigation.Repeating irrigations gradually reduced the infiltration coefficient,infiltration index and surface infiltration capacity,thereby improving irrigation efficiency and uniformness.The infiltration coefficient was linearly related to irrigation duration.

关 键 词：winSRFR 入渗系数 灌水质量 灌水历时 

分 类 号：S275.3[农业科学—农业水土工程]