CAJ | 학술논문

为了深入认识珠江现代入海物质在粤西陆架随海流迁移扩散的路径和沉积中心，利用 Gao-Collins方法分析了粤西琼东北近海1515个站位的粒径趋势，并用210 Pb法测定了8支柱样的现代沉积速率。结果表明，在粤西沿岸流和南海暖流这两个相向海流的共同作用下，珠江口外珠江来源的泥质沉积物的主体被限制在-50 m等深线以浅的内陆架。现代珠江入海物质能维持粤西陆架泥质沉积区0．1 cm/a左右的现代沉积速率。在川山群岛至海陵岛一带和琼州海峡东侧泥质区，分别受岛屿阻挡和逆时针中尺度涡旋的影响，形成了现代沉积中心。在沉积物不同粒级的来源和搬运方式存在差异的地方，粒径趋势分析结果可能主要反映的是粗颗粒沉积物的运移趋势，而非细颗粒沉积物的运移方向。
위료심입인식주강현대입해물질재월서륙가수해류천이확산적로경화침적중심，이용 Gao-Collins방법분석료월서경동북근해1515개참위적립경추세，병용210 Pb법측정료8지주양적현대침적속솔。결과표명，재월서연안류화남해난류저량개상향해류적공동작용하，주강구외주강래원적니질침적물적주체피한제재-50 m등심선이천적내륙가。현대주강입해물질능유지월서륙가니질침적구0．1 cm/a좌우적현대침적속솔。재천산군도지해릉도일대화경주해협동측니질구，분별수도서조당화역시침중척도와선적영향，형성료현대침적중심。재침적물불동립급적래원화반운방식존재차이적지방，립경추세분석결과가능주요반영적시조과립침적물적운이추세，이비세과립침적물적운이방향。
To better understand the transport path and deposition center of Pearl River originated sediment on the shelf off western Guangdong coast,the grain size trend of 1 5 1 5 surface sediments were analyzed by using Gao-Collins method and the modern sedimentation rate of 8 core samples was measured based on 210 Pb method.The results show that outside the river mouth,the main part of muddy sediment provided by Pearl River was confined to inner shelf with water depth less than 50 m, due to the combined effects of two oppositely flowing current:the coastal current and the South China Sea warm current.A modern sedimentation rate of about 0.1 cm/a on western Guangdong muddy shelf can be maintained by Pearl River originated sediment.Two modern sedimentation centers exist,they are Chuanshan Islands-Hailing Island muddy zone and the muddy area lay east of Qiongzhou Strait, controlled by island blocking and a counter-clockwise mesoscale eddy,respectively.As the source and the way of transport of coarse and fine sediment may be different,the grain size trend result may mainly reflect the transport trend of coarse sediment but not the migrating direction of fine sediment.