摘要
为进一步探明沟灌灌水沟的水分入渗规律,通过室内沟灌入渗试验,分析了沟灌交汇入渗的入渗规律,建立了沟灌交汇入渗的二阶段入渗模型,研究了沟灌交汇入渗相对与沟灌自由入渗的减渗特性。在此基础上建立了计算沟灌交汇起始时间的计算模型,得出了沟灌交汇入渗阶段的累积减渗量与入渗时间呈幂函数关系,并建立了沟灌交汇入渗减渗率η的公式,将其计算结果和沟灌自由入渗的累积入渗量用文中公式计算,可求得沟灌交汇入渗阶段的累积入渗量,与试验所得结果进行比较,其误差较小,表明建立的减渗率η的计算公式是可靠的。研究结果可为改进沟灌灌水技术提供参考。
In order to understand the patterns of water infiltration in furrow irrigation, based on lab experiment under furrow infiltration, a two stage infiltration model of furrow interference infiltration was founded and the reduced infiltration characteristics of furrow interference infiltration to furrow free infiltration was researched. Basis this, the calculation model to calculation furrow intersection starting time were presented, the reduced infiltration is a function of power to the time, the formula of reduced infiltration rate were presented, the calculated results compared with the results of the trial have little error. It demonstrates that the formula of the reduced infiltration rate is reliable.
出处
《灌溉排水学报》
CSCD
北大核心
2007年第6期51-54,共4页
Journal of Irrigation and Drainage
基金
国家自然科学基金项目(50479052)
国家科技支撑计划课题(2006BAD11B04)
西北农林科技大学青年学术骨干计划资助课题
关键词
沟灌交汇入渗
入渗特性
减渗率
数学模型
furrow interference infiltration
infiltration characteristic
reduced infiltration rate
mathematical models
