珠江口伶仃洋锋的类别及其对沉积的影响

THE FRONTAL CLASSIFICATION AND ITS INFLUENCE ON SEDIMENTATION IN LINGDINGYANG,ZHUJIANG RIVER ESTUARY

根据近年在珠江口伶仃洋的观测资料，对比国外有关河口锋的定义，归纳了伶仃洋内几种锋的现象，计有潮侵锋、岬角锋及湖水退急时的浅滩锋等。解释了锋生的原因与潮汐进退，特别与随潮入侵的咸水关系。文中也探讨了这些锋对沉积环境的影响，认为它是陆架水入侵河口地区的一种不容忽视的沉积动力过程。

ronts can be found in Lingdingyang with the following phenomena: (1) Tidalintrusion fronts, that are generated by intrusion flood currents coming from both flanks of Dahao Island that collide with diluted water in Tonggu shallow sea,which drives the formation of submerged sand banks. (2) Headland fronts, as the intrusion current arriving at Mawan Cape flows in a curve, concentrating the current stream into a jet-like flow in the north direction and hiding under the diluted water, it will lead to the development of fronts. (3)Off Humen mouth,water come from different sources,and when the gradientsof speed and density is quite large there would be frontogenesis, which would often expand into an oblique plume front. (4)Shoal fronts, the most impressive sight of frontogenesis occur on the border of the west shoal that are formed by horizontal shearing motion and density difference between the runoff coming from three mouths in the west and the diluted water discharged from Humen.