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1 水库概况 斋堂水库位于永定河支流清水河上。流域面积354 km~2,上游植被覆盖情况较好,一般年份来砂量很少。流域多年平均降水量591.9 mm,其中60％集中在夏季。夏季气温日内变化较大。坝址附近高程412 m左右,河床宽160～240 m,河道纵坡1％,为砂卵石覆盖。河床覆盖层大体可分为上下两层,上部为卵石夹薄层黏土透镜体,厚度约20 m左右,下部为卵石层混黏性土,厚度不一,最厚为20 m左右,向两
1 Reservoir Overview Zhaitang reservoir is located in the tributaries of Yongding River Qingshui River. Watershed area of 354 km ~ 2, the upper reaches of the vegetation cover is better, the general year to sand very little. The average annual precipitation in the basin is 591.9 mm, of which 60% is concentrated in summer. Summer temperatures vary greatly during the day. The dam elevation is about 412 m, the width of the riverbed is 160-240 m, and the longitudinal slope of the river channel is 1%, covered by sand and gravel. The riverbed cover can be roughly divided into upper and lower two layers, the upper part is pebble folder thin clay lens body, the thickness is about 20 m, the lower part is pebble layer mixed clay, the thickness is different, the thickest is about 20 m,