添加γ-聚谷氨酸条件下Philip模型与Green-Ampt入渗模型的对比分析
发布时间：2018-10-19 10:38
【摘要】：干旱加剧及土壤退化严重,使新型保水剂γ-聚谷氨酸(γ-PGA)的应用在农田节水灌溉中开始暂露头角。基于室内垂直一维入渗试验,在分析了γ-PGA对土壤水分入渗能力的影响的同时还对Philip模型和Green-Ampt入渗模型进行对比分析。结果表明:与未施加聚谷氨酸的处理(对照组)相比,随着γ-PGA施量的增加,累积入渗量和入渗率均呈单调递减趋势;两个入渗模型的拟合结果显示:Philip公式中,吸渗率呈减小趋势,Green-Ampt公式中,饱和导水率、饱和导水率与土壤水吸力的乘积都呈减小趋势,但土壤水吸力无明显变化。Philip模型与Green-Ampt入渗模型的对比分析结果表明:利用模型参数互推关系计算的Philip模型计算参数与拟合参数的一致性较好,而Green-Ampt模型的计算参数与拟合参数的一致性较差;利用Philip模型计算参数计算的累积入渗量与实测累积入渗量之间的吻合程度高,均方根误差小于0.5,而利用Green-Ampt模型计算参数计算的累积入渗量与实测累积入渗量之间的吻合程度较差,均方根差均大于0.5。说明在添加保水剂的条件下采用Philip入渗模型确定入渗参数时较为精确。
[Abstract]:Drought and soil degradation have made the application of 纬 -polyglutamic acid (纬-PGA), a new water-retaining agent, to water saving irrigation in farmland. Based on the indoor vertical one-dimensional infiltration test, the effects of 纬-PGA on soil water infiltration capacity were analyzed, and the Philip model and Green-Ampt infiltration model were compared and analyzed. The results showed that with the increase of 纬-PGA application rate, the cumulative infiltration rate and infiltration rate decreased monotonously compared with the control group, and the fitting results of the two infiltration models showed that: in the Philip formula, In the Green-Ampt formula, the product of saturated water conductivity and soil water suction showed a decreasing trend. The results of comparison and analysis between Philip model and Green-Ampt infiltration model showed that the calculated parameters of Philip model and fitting parameters were consistent with each other. However, the consistency between the calculation parameters and fitting parameters of Green-Ampt model is poor, and the degree of agreement between the cumulative infiltration calculated by Philip model and the measured cumulative infiltration is high. The root mean square error (RMS) is less than 0.5, and the RMS root difference is greater than 0.5, and the agreement between the cumulative infiltration calculated by the Green-Ampt model and the measured cumulative infiltration is not good. It shows that the Philip infiltration model is more accurate in determining the infiltration parameters under the condition of adding water retaining agent.
【作者单位】： 西北旱区生态水利工程国家重点实验室培育基地(西安理工大学);黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：国家自然科学基金资助项目(51379173) 新疆维吾尔自治区科技计划项目(2011301033)
【分类号】：S152.7
[Abstract]:Drought and soil degradation have made the application of 纬 -polyglutamic acid (纬-PGA), a new water-retaining agent, to water saving irrigation in farmland. Based on the indoor vertical one-dimensional infiltration test, the effects of 纬-PGA on soil water infiltration capacity were analyzed, and the Philip model and Green-Ampt infiltration model were compared and analyzed. The results showed that with the increase of 纬-PGA application rate, the cumulative infiltration rate and infiltration rate decreased monotonously compared with the control group, and the fitting results of the two infiltration models showed that: in the Philip formula, In the Green-Ampt formula, the product of saturated water conductivity and soil water suction showed a decreasing trend. The results of comparison and analysis between Philip model and Green-Ampt infiltration model showed that the calculated parameters of Philip model and fitting parameters were consistent with each other. However, the consistency between the calculation parameters and fitting parameters of Green-Ampt model is poor, and the degree of agreement between the cumulative infiltration calculated by Philip model and the measured cumulative infiltration is high. The root mean square error (RMS) is less than 0.5, and the RMS root difference is greater than 0.5, and the agreement between the cumulative infiltration calculated by the Green-Ampt model and the measured cumulative infiltration is not good. It shows that the Philip infiltration model is more accurate in determining the infiltration parameters under the condition of adding water retaining agent.
【作者单位】： 西北旱区生态水利工程国家重点实验室培育基地(西安理工大学);黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：国家自然科学基金资助项目(51379173) 新疆维吾尔自治区科技计划项目(2011301033)
【分类号】：S152.7
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