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1 区域地质概况 永定河滞洪水库区属山前沉降型平原河谷地貌,永定河全新世以来在场区附近多次摆动、改道,至公元1698年筑成系统堤防后,方被挟制于堤内。永定河大堤内为永定河现漫滩及河床,滞洪水库即建在永定河右侧河漫滩上。库区内均被第四系冲洪积层所覆盖,下伏早第三系粘土岩及碎屑岩。库区钻孔揭露的地层主要为第四系全新统冲洪
1 Regional Geological Survey Yongding River detention flood reservoir area is a mountain settlement plains valley landform, Yongding River since the Holocene many swing around the field area, diversion, to the year 1698 built system dike, the party was reined in the dike. The Yongding River embankment is the Yongding River now floodplain and riverbed, stagnant flood reservoir that is built on the right side of Yongding River floodplain. The reservoir area is covered by the Quaternary alluvial accumulation, the underlying Early Triassic clay rocks and clastic rocks. The strata revealed by borehole drilling in the reservoir area are mainly flood draining of Quaternary Holocene