基于数值模拟的新疆灌溉水田间入渗系数研究

Numerical Simulation of Field Infiltration Coefficient Under Different Irrigation Scheduling in Xinjiang

在我国干旱内陆地区,节水灌溉技术的发展使得地下水资源发生变化,精确评价地下水资源量的核心是确定灌溉水的田间入渗系数。为了研究不同灌溉模式下的田间入渗系数,采用HYDRUS-1D软件建立模型,以豆类作物为研究对象,对两种不同灌溉模式下的田间入渗系数进行模拟,模拟结果的相对误差为1.5%,证明模型对土壤水渗漏规律及灌溉水渗漏量的模拟是可靠的。传统灌溉与节水灌溉的田间入渗系数分别是0.542和0.337,同时,作物不同生长期的渗漏累积变化量及田间入渗系数也有所差异。不同灌溉模式下的田间入渗系数取值范围的确定能为地下水资源评价提供理论支持。

The groundwater is decreasing with the development of the water-saving irrigation technology, the key to the research on groundwater change is the field infiltration coefficient. Based on the theory of soil water dynamics, a soil water simulation model is proposed. Beans are selected as the research plant, the irrigation water leakage loss of conventional and water-saving irrigation are simulated by soil water infiltration model of HYDRUS-1D. Results show that the simulation relative error is 1.5%, which is in a reasonable range. The variation trend and the accumulation changes of plant growth factors are simulated and shown in different growth stage. The field infiltration coefficient of these two irrigation scheduling are 0.542 and 0.337, respectively. At the same time, the field infiltration coeffcient different in the growth stage of the plant. The range of field infiltration coefficient under different irrigations quote can provide a theoretical support for the groundwater evaluation of resources.