摘要
为给滴灌制度提供设计依据,研究了地表滴灌下土壤湿润体的运移规律。设置33种情景,采用SWMS_2D模型进行数值模拟实验,建立了描述土壤饱和导水率、初始含水率和滴头流量等影响湿润体运移规律的经验关系式。结果表明:湿润体体积与灌水量成正比,比例系数与土壤饱和含水率和初始含水率正相关,与滴头流量负相关;湿润锋比和灌水量之间呈幂函数关系,主要受地表积水入渗半径的影响,地表积水半径由滴头流量与土壤饱和导水率的比例决定。与其他试验数据对比表明,本经验关系式具有较高的模拟精度。
The movement of soil wetted bodies during surface drip irrigation was studied to improve the drip irrigation system design.The SWMS_2D model was used to numerically analyze 33 situations of 2-D soil water movement.Two empirical equations were then formulated to describe the effects of the saturated hydraulic conductivity,Ks,initial soil moisture content,θ0,and trickle discharge rate,qV,on the development of soil wetted bodies.The results show a linear relationship between the volume of the wetted soil body and the total volume of irrigated water.The volume increases with Ks and θ0 and decreases with qV.The ratio of the radial to vertical wetting fronts was found to be related exponentially to the irrigated water volume,which depends on the ratio of qV to Ks.These formulas agree well with experimental data from other literatures.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第6期839-843,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家“十一五”规划科技支撑计划项目(2007BAD38B01
2006BAD11B08-5)
关键词
地表滴灌
土壤湿润体
数值模拟
SWMS_2D模型
surface drip irrigation
soil wetted volume
mathematical simulation
SWMS_2D model
