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对北京永定河冲积洪积扇中的地下水补给来源,以往有关文件的论述中,一般仅能给予定性的结论,这样的结论,肯定是不能满足于客观发展需要的。北京地下水长期观测站根据北京区域地下水长期观测的结果,进行了综合的分析研究,初步求得影响北京永定河冲积洪积扇中之地下水形成过程。本文仅根据1958年的观测成果,以及收集了有关方面的资料,对北京永定河冲积洪积扇顶部潛水的均衡进行的初步的论述如下:
For the sources of groundwater recharge in the alluvial fan of the Yongdinghe River in Beijing, in the past discussion of relevant documents, generally, only qualitative conclusions can be given. Such a conclusion can not be satisfied by objective development. Based on the results of long-term groundwater observation in Beijing area, Beijing Long-term Observatory conducted a comprehensive analysis and study, initially determining the groundwater formation process in the alluvial-alluvial fan of the Yongding River in Beijing. Based on the observations made in 1958 and the data collected, the preliminary discussion of the equilibria at the top of the alluvial fan in Beijing Yongding River is as follows: