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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。
In order to provide the design basis for drip irrigation system, the movement rule of soil wetting body under surface drip irrigation was studied. 33 scenarios were set up. The SWMS_2D model was used to carry out numerical simulation experiments. The empirical relationship between the saturated hydraulic conductivity of soil and the initial moisture content and dripper flow was established. The results showed that the volume of wetting body was proportional to the amount of irrigation water, the proportion coefficient was positively correlated with the saturated water content and the initial moisture content of soil, and negatively correlated with the drip flow rate. The relationship between wetting front ratio and irrigation volume was power function, Water infiltration radius, surface water radius by the dripper flow rate and saturated soil hydraulic conductivity ratio of the decision. The comparison with other experimental data shows that this empirical relation has higher simulation accuracy.