福建闽江河口水下地形变化的遥感分析

Remote Sensing Analysis on the change of Underwater Topography in Minjiang Estuary,Fujian Province

本文利用Landsat-TM影像,建立了闽江河口的遥感水深模型,对河口区的水下地形进行了解译,并分析了其水下地形变化状况及影响因素,认为淤积主要发生在水动力条件较弱以及泥沙含量较高的地区,主要是在梅花水道琅岐岛南侧、鳝鱼沙及其附近区域、乌渚水道靠近主航道的部分以及内拦门沙区等大片区域。冲刷区主要是发生在水流转向或者水动力条件强的区域,主要是闽江从亭江至头深水槽、梅花水道中径流作用弱而潮流作用强的区域等。闽江主航道深水槽处于冲刷状态,而主航道两侧淤积。

Using the image of Landsat-TM, This paper builds the water depth model of Minjiang Estuary, interpreted the underwater topography and analyzes the change and the influence factor of the underwater topography. It concludes that alluvial action takes place in where water dynamical condition is weak and the concentration of mud and sand is high, such as the south of Langqi Island of Meihua Water Road, the nearby area of Shanyusha, the part of Wuzhu Water Road, which is near the main sea channel and the part of Leilanmensha and that erosion takes place in where the water flow turns around and the water dynamical condition is strong It further includes that the runoff in the deep water groove from Tingjiang to Guanto and the area in Meihua Water Road is weak and the tide is strong. The deep water groove of the main sea channel of Minjiang is under erosion and the two sides of the sea-route are under alluvial action.