基于SRFR模型的畦灌入渗参数推求及模拟分析

Border Irrigation Infiltration Parameters Calculation and Simulation Analysis Based on SRFR Model

土壤入渗参数决定着灌溉水转换为土壤水的分布和速度,是确定地面节水灌溉灌水技术参数主要依据之一,它进而影响到地面灌溉的灌溉效果和灌水质量,因此,确定合理的土壤入渗参数是地面灌溉系统设计和管理必须解决的关键问题之一。根据田间实测资料,利用WinSRFR4.1软件对畦灌条件下田间土壤入渗参数进行优化求解,并对水流特性进行了数学模拟。结果表明,在通过WinSRFR4.1模型优化计算得到的土壤入渗参数和曼宁糙率系数下,采用该模型模拟的水流运动过程同实测值一致,两者吻合程度较高,因此计算土壤平均入渗参数和曼宁糙率值的方法不仅简便而且具有较高的可靠性。

Soil infiltration parameters determine the conversion of the main bases for determining technical parameters of the velocity and distribution from irrigation water to soil water. It is one ground water saving irrigation, and affects the irrigation effect and quality of ground irrigation. Therefore, determining reasonable soil infiltration parameters is the key problems for the surface irriga- tion system design and management. In this paper, based on the field measured data, the WinSRFR4. 1 software is used to optimize the soil infiltration parameters under the border irrigation conditions, and the flow characteristic is simulated. The result shows that the under the soil infiltration parameters calculated by WinSRFR4. 1 model and the Manning roughness coefficient, the simulation re- sult of water flow is consistent with the measured one, and the match degree is higher. So the method mentioned in this paper for calculating average soil infiltration parameters and the Manning roughness value is not only simple, but also has high reliability.