【摘要】 通过赣江南昌段一江心洲的实地考察,分析了江心洲不同部位沉积物特征、落淤层发育特征、江心洲发育过程。江心洲头部水动力最强,沉积物较粗,连续性最好;侧翼也以粗粒沉积物为主,但含有大量泥砾;顶部和尾部发育横向连续的落淤层。落淤层易板结,边缘龟裂,被河水打碎搬运。保留下来的落淤层分布局限,头部和侧翼均不易保存,顶部和尾部保存较好。另外,保存下来的落淤层近于水平,对非均质性的影响主要为垂向的,侧向连通性好。更多还原

【Abstract】 Based on field study on some central bar in Nanchang section,Ganjiang river,following details were studied:(1) sedimentary characteristics of sediments in different parts of central bar;(2) characteristics of muddy layers and their distributions; and(3) forming process of central bar. The head has the strongest hydrodynamic and sediments are mainly coarse sand and fine gravel,with a good lateral continuity; the wings has a strong hydrodynamic and sediments are also coarse,with many boulder clay; the top and tail have horizontal continuous mud layers. Mud layers tend to harden and crack,and fragments are apt to be carried by water.Mud layers kept down distributed limited and subhorizontal. Mud layers control vertical heterogeneity with a good lateral connectivity.更多还原