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通过滴灌入渗结束的覆膜开孔蒸发实验,分析了土表覆膜开孔率对累积蒸发量随时间变化趋势的影响。累积蒸发量与时间平方根的线性关系符合Gardner的理论关系,而两者关系的系数又与覆膜开孔率之间存在良好的对数关系,从而得出了累积蒸发量的两因素函数关系。这一结果发展了Gardner的理论关系并将其应用于覆膜开孔蒸发的实践上。对相对累积蒸发量和单位膜孔面积的累积蒸发量随开孔率变化的函数特征进行了定量分析,并分析比较了全覆膜和不覆膜蒸发条件下含水率、含盐率和盐分浓度特征,做出了相应水盐特征的等值线图。
Through the experiment of drip perfusion infiltration, the influence of open area on the cumulative evaporation amount with time was analyzed. The linear relationship between the cumulative evaporation and the square root of time accords with the Gardner’s theoretical relationship, and the relationship between the two coefficients has a good logarithmic relationship with the open area ratio of the film. Thus, the two-factor function of cumulative evaporation is obtained. This result developed Gardner’s theoretical relationship and applied it to the practice of film hole evaporation. The cumulative evapotranspiration and per unit area of the membrane per unit area were quantitatively analyzed as a function of the change of porosity. The moisture content, salt content and salt concentration Characteristics, made the corresponding water and salt contour map.