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我国首都北京,座落在永定河冲积扇上。在该冲积扇上,曾发育多条永定河的古河道。现今,这些古河道多已湮没,只剩下一些断头的小河,分别汇入温榆河、北运河水系(图1)。 由于古河道研究不仅在探讨第四纪古地理环境与新构造运动等理论问题上有重要意义,而且关系到城市工程建设、供水与排水、环境保护与地震区划等实际问题,因此,永定河古河道研究,一直引起人们的注意。早在1920年,叶良辅就探讨过永定河迁流辩问题。解放以后,
Beijing, the capital of our country, is located on the alluvial fan of the Yongding River. On this alluvial fan, there were many ancient rivers of the Yongding River. Today, many of these ancient rivers have been obliterated, leaving only some broken rivers, respectively, into the Wenyu River, North Canal water system (Figure 1). Since the study of ancient river courses is of great significance not only in theoretical issues such as quaternary paleoclimate environment and neotectonic movement, but also in practical issues such as urban construction, water supply and drainage, environmental protection and seismic zoning, Road research, has drawn the attention of people. As early as 1920, Ye Liang Fu on Yongding River to discuss the flow of debate. After liberation,