基于IPARM方法估算沟灌土壤入渗参数

为提高沟灌土壤入渗参数的估算精度,缩小沟灌模拟误差.该文以水量平衡方程为基础,采用IPARM方法建立了沟灌Kostiakov-Lewis入渗方程中参数的估算方法,并根据一组田间实测沟灌资料对入渗参数进行了估算,利用WinSRFR1.1软件对沟灌水流运动进行了模拟.结果表明:用水流推进和径流数据比只用水流推进数据计算的入渗参数的精确度高,可以提高累积入渗量模拟的准确性,并可以将模拟时间延长;在模拟径流量时预测值和实测值的吻合较好.预测精度较高.用IPARM方法估算土壤入渗参数在沟灌模拟和管理中具有较高的可靠性.

Estimation of soil infiltration parameters during furrow irrigation based on IPARM method

To improve the precision of soil infiltration parameters estimation in furrow irrigation and narrow the simulation error of furrow irrigation. In this paper, based on the water balance equation, infiltration parameters from advance and runoff model (IPARM) method was used to estimate the soil permeation parameters of Kostiakov-Lewis equation in furrow irrigation, according to a set of field furrow irrigation data to estimate the parameters, and utilizing WinSRFR1.1 software to simulate the water flow in furrow irrigation. Results show that the accuracy of infiltration parameters estimated with water advance and runoff data is higher than that estimated with water advance data only, it can improve the accuracy of accumulative infiltration simulation, and can lengthen the simulation time; and also minimize the predicted value and measured value of runoff rates of simulation, also the predict precision is relatively high. Therefore, IPARM method has higher reliability to estimate the soil infiltration parameters in furrow irrigation for the simulation and management of furrow irrigation.