长江口北支沉积动力环境分析

长江口北支为喇叭形准强潮河口，其发育深受地形条件、水动力因素和泥沙来源的制约，并因此而形成了复杂的沉积环境和沉积特征。作者以北支表层沉积物粒度分析资料为依据，阐明长江口北支表层沉积物的分布规律，试用M.Pejrp的新三角图式划分长江口北支的沉积动力环境（相），以期揭示北支的沉积作用机制，为深入研究长江口北支演变规律及北支的开发治理提供科学依据。

Dynamic Sediment Environment of the North Branch of Changjiang Estuary

The North Branch of Changjiang Estuary is a quasi macrotidal estuary, which is funnel in shape. Its development is greatly controlled by the topographic feature, hydrodynamic conditions and sediment source. Therefore, the North Branch forms the complex sediment environment and sediment characteristics. This paper, based on the data of the sediments grain size analysis, expounds the distribution law of the surface sediments in the North Branch, and divides the dynamic sediment environments with a new triangular diagram advanced by M.Pejrup. All of this would contribute to the understanding of the sedimentation mechanism of the North Branch, and provide scientific basis for developing the North Branch of Changjiang Estuary.