地下水浅埋区土壤水分运动参数田间测定方法探讨

研究ＧＳＰＡＣ系统的水分运移机理和建立统一的水系统模型需要确定土壤水分运动参数。本文根据田间土壤排水试验的观测数据，初步探讨了地下水浅埋区土壤水分运动参数的确定方法。该方法将多维问题最优化技术与土壤水运动方程数值求解技术相结合，寻求田间条件下最优的土壤水分运动参数，克服了室内试验方法的不足。田间土壤排水试验无须特殊的试验设备和试验条件，具有较强的可操作性。

Studies of soil water movement in GSPAC system and modeling water flow necessitate the determination of soil hydraulic properties.A parameter estimation method of determing water retention and hydraulic permeability functions simultaneously from field drainage experiment was discussed for the zone where a shallow groundwater table is prevailing.The optimization and numerical techniques were used to determine soil hydraulic properties,making up for the defects of laboratory measurment.