南黄海西部滨浅海区埋藏古河道研究

Study on Buried Channel Systems in the Western South Yellow Sea

利用高分辨率浅层地震剖面对南黄海西部陆架浅海区埋藏古河道形态进行定量分析,估算其形成时期水动力环境的古水文参数,进而评价古环境。结果表明,被埋藏的下切古河道形成于距今大约4.4万a前,那时,南黄海西部陆架区出露地表。后来,随着全新世海侵时期海平面不断上升,河谷被淹没填埋。研究区经历了从陆地河流到河口和全部被海水淹没的过程。

Based on high-resolution shallow seismic profiles, morphology of the buried channels in the western shallow continental shelf area of the South Yellow Sea is quantitatively analyzed, with the at- tempts to estimate the paleo-hydrologic parameters during the formation of the incised channels and hence to assess the paleo-environment in which the channels formed. The results indicate that the buried chan nels formed at about 44 eal kyr BP when the western shelf of the South Yellow Sea exposed subaerially, and drowned and filled subsequently with the sea-level rising during the Holocene transgression. The stud- y area experienced the processes from fluvial and estuarine to fully marine.