辽东湾北部浅海区泥沙输送及其沉积特征

根据实测资料，本文定量分析了辽东湾北部泥沙输送及其分布，并对辽河三角洲沉积区划作了初步讨论。研究表明本区泥沙以纵向搬运为特征。双台子河以西来沙和辽河西水道入海泥沙是区域东部拦门沙体和浅滩发育的主导因素。汛季大潮期，泥沙自西向东运移落淤在河口及毗邻浅水域；小潮期，泥沙除向东扩散外，大部泥沙向海方搬运。调查区可划分六个现代沉积作用区，即潮坪沉积区、辽河水下三角洲细粒沉积区、河口沙洲沉积区、波浪潮流冲蚀沉积区、河口冲积沉积区以及潮汐水道沉积区。

Suspended Sediment Transport Tendency and the Study of Sedimentary Divisions in the Northern Liaodong Bay

The sea area around the Liaohe estuary refers to a region between the Liaohe estuary to the east and the Xiaolinghe estuary to the west, of which the water depth is defined less than 20 m. Drainages which enter into the sea are the Liaohe, Shuangtaihe, Dalinghe and Xiaolinghe rivers, characterized by 9.14×10 9 m 3/a of total water discharge and 4.9×10 7 t/a sediment input. Broad tidal flat and submerged deltas were attributed to the large capicity of sedimentary input. Based on the spot investigating data(1988), the authors calculated the distribution of the suspended deposit in the northern Liaodong Bay, and analysed sediment divisions of the Liaohe delta. The results indicated that the suspended matter moved in longitudinal direction. Water and sand from the Shuangtai river and the west area of the river are the main facter for the shoal development in the eastern part of this area. During spring tide, the suspended sediment of the rivers and marine sources can remain in river mouths and aroun shallow water. Main dispersion directions of sediments are southeastwards to the western and the central areas and northeastwards to the eastern part during flood tide. During neap tide, however, sediments from rivers and resuspended sediment from the estuary migrate in the same directions mentioned-above. The investigating area is divided into six modern sediment areas, they are tide flat deposit area, subaqueous delta fine sedimentary area, estuarine sand bank deposit area, estuarine alluvial deposit area, tidal stream and wave cut deposit area, and tide and waterway deposit area. It is noted that bottom configurations of the east in this area are very complicated and the bottoms are subjected to intensive disturbing and scouring, which induce active slide and flows in underconsolidated sediments on the Liaohe delta.