摘要
黄河三角洲刁口叶瓣于1964—1976年间堆积而成,中国大型滩浅海油田—埕岛油田在这个叶瓣上建设开发,该叶瓣的形成过程与地层结构对海洋工程建设影响较大。根据多年历史测深资料,研究了刁口叶瓣形成期间河口摆动与堆积体演变过程,依据堆积中心的位置变化明确了古河口摆动规律。1964—1966年河口及堆积体在叶瓣西侧发育,在柯氏力作用下,河口逐渐NNE向摆动,堆积中心移动到叶瓣东侧;1975—1976年,由于河道摆动曲率过大引发失稳,河道取直后堆积中心又回到叶瓣西侧。根据堆积速率和河口位置将形成期分为3个阶段:近岸堆积阶段(1964—1966年)、整体堆积阶段(1966—1975年)和调整堆积阶段(1975—1976年)。受黄河海港附近M2无潮点影响下的强潮流场控制,刁口叶瓣东侧在形成早期和末期存在局部冲刷作用,而叶瓣西侧是三角洲形成期堆积最活跃的区域。
The Diaokou Lobe in Yellow River Delta was formed from 1964 to 1976 under human intervention at the beginning,on which the Chengdao Oilfield,a large beach shallow-sea oil field in China,was constructed and developed.The formation and stratum structure of the lobe have a great impact on marine construction of the oil field.Therefore,the multiple historical sounding data were collected and analyzed,from which the process of estuarine oscillation and sedimentation evolution during the formation of the Diaokou Lobe were anatomized.Based on the changes in the position of the sedimentation center,the estuarine oscillation pattern of the lobe in the past was clarified.From 1964 to 1966,estuary deposits were developed in the west flank of the lobe.Under the Coriolis force,the river mouth gradually moved towards NNE and the sedimentation center moved to the east of the lobe.From 1975 to 1976,due to the instability resulted from excessive swing curvature of river channel,the river channel was cut straight artificially,and afterward the sedimentation center returned to the west side of the lobe.The lobe formation could be divided into three stages based on the accumulation rate and river mouth position:nearshore accumulation(1964-1966),overall accumulation(1966-1975),and adjusting accumulation(1975-1976).Controlled by the strong tidal flow field by the M2 tidal point near the Yellow River Seaport,local erosion took place on the eastern flank of the Diaokou Lobe in the early and late stages of the lobe formation period,while the western flank of the lobe was the most active accumulation area in the delta during the lobe formation.
作者
邢吕阳
李广雪
刘思雨
李浩楠
潘煜峰
XING Lvyang;LI Guangxue;LIU Siyu;LI Haonan;PAN Yufeng(Key Lab of Submarine Geosciences and Prospecting Techniques,Ocean University of China,Qingdao 266100,China;Academy of the Future Ocean,Ocean University of China,Qingdao 266100,China)
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2023年第4期97-104,共8页
Marine Geology & Quaternary Geology
基金
国家自然科学基金创新群体项目“海底古地貌动态重建”(42121005)。
关键词
堆积中心
河口摆动
刁口叶瓣
黄河三角洲
sedimentation center
river mouth shifting
Diaokou Lobe
Yellow River delta
