用放射性示踪沙定量观测长江口北槽航道抛泥区泥沙运动  

QUANTATIVE DETERMINATION OF SEDIMENT MOVEMENT AT THE LANDWARD SPOIL GROUND IN THE YANGTZE ESTUARY WITH RADIOACTIVE TRACER

作　　者：李樟苏[1] 

机构地区：[1]南京水利科学研究院

出　　处：《核科学与工程》1993年第2期179-185,8,共7页Nuclear Science and Engineering

摘　　要：1991年6月,在长江口北槽航道上抛泥区进行了一次放射性示踪沙试验。示踪沙投放总量为495g,示踪核素为^(46)Sc,总活度为17.95×10^(10)Bq(4.85 Ci)。试验目的是通过定量观测底沙运移的方向、路线、速度和输沙率,为北槽航道上抛泥区今后能否继续使用提供论据。试验观测资料表明:在中小汛期间,无论是涨潮还是落潮时投放的示踪沙都在落潮流控制下向北槽航道中段输移,并最终沿着110°的运动方向以758 m/d的运移速度,在269号航标附近进入挖槽,单宽输沙率为47.8 m^3/md。This paper describes a radioactive tracer experiment carried out at the landward spoil ground of the North Passage in the Yangtze Estuary in June of 1991. The scandium-46 was selected as the tracer, the total activity released is 17. 95×10^(10) Bq(4. 85 Ci), the amount of the scandium-46 glass is 495 g. The purpose of the experiment is to determine the sediment movement direction, path, velocity and transport rate. Those provide the direct evidence for using the landward spoil ground in the future. The experiment result shows the sediment movement was governed by the ebb tide current during the period of middle and neap tides when the radioactive tracer was injected both on the flood and ebb tides, and the sediment moved from the injection points to the middle of the North Passage near the navigation buoy No. 269. The direction of the sediment movement is 110°, the particle velocity is 758 m/d, and the sediment transport rate per unit width is 47. 8 m^3/md.

关 键 词：航道疏浚 泥沙运动 同位素示踪 

分 类 号：U616[交通运输工程—船舶及航道工程]