地面水—土壤水—地下水连续系统田间水有效性评价

Evaluation of Field Water Efficiency in Surface Water-Soil Water-Ground water Continuum

本文将灌溉管理质量评价体系中的田间水有效性,区分为存贮效率和利用效率,对两种指标评价的物理意义、实验方法及具体数值,结合气候干旱、浅地下水埋深型灌区求得初步研究成果。评价田间水利用的有效性应以作物需水量为目标,考虑地面水—土壤水—地下水连续系统(SSGC)中的水量交换,对单元体总水量进行动态评估,较传统方法合理,符合浅地下水埋深型灌区实际,有助于节水灌溉的分析与管理决策。

In the qualitative evaluation system of irrigation management, the effectiveness of field water has been divided into two parts, i. e. storage efficiency and effective efficiency. Integrating the arid climate and irrigation district with shallow ground water table,preliminary research results of the physical meaning,the experiment method and exact value of the evaluation method of two index have been achieved. According to the crop water requirement and considering the water exchange in the surface water-soil water -ground water continuum (SSGC), dynamic evaluation method of unit total water quantity has been adopted in evaluation of the effective efficiency of field water. Results showed that it was more rational than traditional method and closer to reality of the irrigation district with a shallow water table and it was useful for analysis and management decision of water -saving irrigation.