Because of the shortage of water resources, the phenomenon of groundwater over-extraction is widespread in many parts of the world, which has become a hot issue to be solved. The traditional idea of water resources management only considering blue water (stream flow) cannot meet the demand of sustainable utilization of water resources. Blue water accounts for less than 40% of total rainfall, while green water (evapotranspiration) accounts for more than 60% of total rainfall. In the natural environment, vegetation growth mainly depends on green water, which is often neglected. Obviously, the traditional water resources management without considering green water has obvious deficiencies, which cannot really reflect the regional water consumption situation in the water resources management. And only by limiting water consumption can achieve the real water-saving. In addition, the mode of water resources development and utilization has changed from “supply according to demand” to “demand according to supply”. In this background, for many regions with limited water resources, it is impossible to rely on excessive water intake for development, and sustainable development of regional can only be realized by truly controlling water demand. This paper chooses Shijin Irrigation District in the North China Plain as the research area, where agricultural water consumption is high and groundwater over-extraction is serious and ecological environment is bad. In order to alleviate this situation, comprehensive regulation of water resources based ET is necessary. Therefore, this paper focuses on the concept of ET water resources management and includes green water into water resources assessment. Based on the principle of water balance, the target ET value of crops in the study area is calculated, and the ET value is taken as the target of water resources regulation. The actual water consumption is calculated by Penman-Monteith formula, and reduction of crop water consumption is obtained according to the difference between actual ET and target ET. The reduction in crop water consumption leads to a reduction in demand for water supply, which reduces groundwater extraction. The results of this study can provide necessary technical support for solving the problem of groundwater over-extraction and realizing real water-saving.

由于水资源短缺，地下水超采现象在世界许多地区普遍存在，成为亟待解决的热点问题。传统的仅考虑蓝水（溪流）的水资源管理思想不能满足水资源可持续利用的需求。蓝水占总降雨量的不到 40%，而绿水（蒸散）占总降雨量的 60% 以上。在自然环境中，植被生长主要依赖于绿水，而这一点往往被忽视。显然，不考虑绿水的传统水资源管理存在明显不足，在水资源管理中不能真实反映区域用水情况。而只有限制用水量，才能实现真正的节水。此外，水资源开发利用方式由“按需求供给”转变为“按供给需求”。在此背景下，对于许多水资源有限的地区来说，发展不可能依赖过量取水，只有真正控制用水需求才能实现区域可持续发展。本文选择华北平原石津灌区作为研究区，该区农业用水量大，地下水超采严重，生态环境恶劣。为了缓解这种情况，需要基于ET对水资源进行综合调控。所以，本文重点介绍ET水资源管理的概念，并将绿色水纳入水资源评估。根据水分平衡原理，计算出研究区农作物的目标ET值，并将ET值作为水资源调控的目标。实际用水量采用 Penman-Monteith 公式计算，根据实际 ET 与目标 ET 的差值得出作物用水量的减少量。农作物用水量的减少导致对供水的需求减少，从而减少了地下水的开采。本研究结果可为解决地下水超采问题，实现真正节水提供必要的技术支持。计算研究区农作物的目标ET值，并将ET值作为水资源调控的目标。实际用水量采用 Penman-Monteith 公式计算，根据实际 ET 与目标 ET 的差值得出作物用水量的减少量。农作物用水量的减少导致对供水的需求减少，从而减少了地下水的开采。本研究结果可为解决地下水超采问题，实现真正节水提供必要的技术支持。计算研究区农作物的目标ET值，并将ET值作为水资源调控的目标。实际用水量采用 Penman-Monteith 公式计算，根据实际 ET 与目标 ET 的差值得出作物用水量的减少量。农作物用水量的减少导致对供水的需求减少，从而减少了地下水的开采。本研究结果可为解决地下水超采问题，实现真正节水提供必要的技术支持。根据实际排放量与目标排放量的差值获得作物用水量的减少量。农作物用水量的减少导致对供水的需求减少，从而减少了地下水的开采。本研究结果可为解决地下水超采问题，实现真正节水提供必要的技术支持。根据实际排放量与目标排放量的差值获得作物用水量的减少量。农作物用水量的减少导致对供水的需求减少，从而减少了地下水的开采。本研究结果可为解决地下水超采问题，实现真正节水提供必要的技术支持。