摘要
金沙江下游的推移质输移规律及其泥沙来量和级配对梯级水库的淤积分布以及河势将产生长远影响,需要开展深入研究。在金沙江下游入库控制站三堆子水文站水尺上游100 m布设推移质测验断面,对该站2007年、2008年的推移质进行了测验;分析了卵石推移质的年内分布、横向分布、级配以及推移质输移与水位、流量、流速的关系。研究表明:三堆子河段卵石推移质具有数量大、粒径大、时间集中、强推带集中、推移带随水位左右摆动的特征;全年输沙量接近500000 t;最大粒径卵石一般在140～170 m之间,最大粒径230 mm以上;推移量主要集中在汛期,尤以7～9月为甚,占全年的90%以上;强推带为140～180 m 4条垂线,其输沙量占整个断面输沙量的90%以上;洪水期推移带向右岸偏移,低水期则向左岸偏移。
In-depth study needs to be conducted on bed load transport rules and sediment load and graduation of lower reach of Jinsha River which have a profound effect on sediment distribution of cascade reservoir and river regime.In this paper,through analyzing bed load test results of Sanduizi Hydrometric Station in lower reach of Jinsha River in the years of 2007 and 2008,the relations between annual distribution,lateral distribution,graduation,transport of bed load in Sanduizi Station and the water level,flow rate and flow velocity were studied.The analysis result showed that Sanduizi river segment had the feature of having Pebble bed load in the whole year,and sand transport mainly concentrated on flood season especially from July to September every year,and the pushing zone was four vertical lines with 140 to 180 m width.
出处
《地理空间信息》
2012年第2期157-160,184,共4页
Geospatial Information
基金
国家"十一五"科技支撑计划重点项目(2007BAB21B01-01A)
关键词
金沙江
三堆子
卵石推移质
粒径
输沙量
Jinsha River,Sanduizi,Pebble Bed Load,particle size,sediment discharge
