南黄海沉积速率和沉积通量的初步研究

PRELIMINARY STUDIES ON SEDIMENTATION RATE AND SEDIMENT FLUX OF THE SOUTH HUANGHAI SEA

1983—1986年,中美联合对南黄海进行了调查,利用同位素^(210)Pb方法测定了该海域的沉积速率和沉积通量,分别介于0.026—0.67cm/a和0.033—0.76g/(cm^2·a)之间。研究表明,山东半岛南侧是现代黄河物质大量沉积的场所,而在黄海暖流流经的地带和冷涡区,其沉积作用却较弱;物质来源和海流体系是控制该海域沉积速率和通量的主导因素。

This is the first report on the sedimentation rate and flux (0.026-0.67 cm/a and 0.033-0.76g/(cm2·a), respectively) of the South Huanghai Sea in recent hundred years. The large depocentre in the whole region lies on the south side of Shandong Peninsula, there accumulate modern Huanghe River materials, the KC-8 station is representative. In the area near the Cheng-shan Cape where the hydrodynamic condition is unusually active (KC-10 station), the sedime ntation flux is extremely low. It seems to be true that the 'relict sand' lies on the east. The sedimentation of the area where the Huanghai Sea Warm Current passes through and the cold eddy area lies is weak. Someone suggested that the mud in the cold eddy area (KC-5, 6, 48) is 'relict mud', but on the basis of the analysis of 210Pb profile, it can be inferred that sedimentation was occurred in the area, only the sedimentation flux was not high in recent hundred years. The sedimentation of other places in the study area is moderate. It has been proved by facts that the main factors controlling the sedimentation rate and flux are material sources and sea current systems.