对渤海湾西岸CH114孔岩心全新世沉积硅藻进行了系统研究，发现硅藻17属28种。与沉积岩石学、年代学（AMS 14C）研究相结合，将该孔自下而上划分为6个硅藻组合带，显示研究区全新世以来经历了从陆到海的演化过程：全新世初期为陆相（组合...对渤海湾西岸CH114孔岩心全新世沉积硅藻进行了系统研究，发现硅藻17属28种。与沉积岩石学、年代学（AMS 14C）研究相结合，将该孔自下而上划分为6个硅藻组合带，显示研究区全新世以来经历了从陆到海的演化过程：全新世初期为陆相（组合1带下部）至受海水影响的盐沼低地环境（组合1带上部）；6646~4280 cal BP年间为受风暴强力事件影响的浅海环境（组合2带）；4280年以来为水深不断变浅的浅海环境（组合3-6带）。CH114孔沉积速率的阶段性变化与河流供给有较好的对应关系：3.6~2.6 ka cal BP和0.4ka cal BP以来两个时段相对较高的沉积速率，分别与黄河三角洲超级叶瓣5的形成和海河独立入海相对应。由硅藻记录的海洋影响的波动变化与全新世气候变化对比显示：研究区海洋影响的增强与气候变暖具有一定的正相关性。CH114孔全新世以来陆海环境的演化，总体上是对气候与海面变化的响应。展开更多
Palaeo-hydrological field investigation was carried out in the middle reaches of the Jinghe River. A set of palaeoflood slackwater deposit beds was identified in the Holocene loess-soil sequence in the riverbanks. The...Palaeo-hydrological field investigation was carried out in the middle reaches of the Jinghe River. A set of palaeoflood slackwater deposit beds was identified in the Holocene loess-soil sequence in the riverbanks. The sediment samples were collected from the profile, and the particle-size distribution, magnetic susceptibility, loss-on-ignition were analyzed in laboratory. The analytical results showed that the palaeoflood slackwater deposits have recorded extraordinary flood events in the Jinghe River valley. According to stratigraphic correlation and OSL dating, the palaeoflood events were dated to 4100-4000 a BP. The palaeoflood peak discharges were estimated to be 19,410-22,280 m^3/s by using the hydrological model and checked by different approaches. These results have the flood data sequence of the Jinghe River extended to 10,000-year time-scale. It provided significant data for hydraulic engineering and for mitigation of flood hazards in the Jinghe River drainage basin.展开更多
文摘对渤海湾西岸CH114孔岩心全新世沉积硅藻进行了系统研究，发现硅藻17属28种。与沉积岩石学、年代学（AMS 14C）研究相结合，将该孔自下而上划分为6个硅藻组合带，显示研究区全新世以来经历了从陆到海的演化过程：全新世初期为陆相（组合1带下部）至受海水影响的盐沼低地环境（组合1带上部）；6646~4280 cal BP年间为受风暴强力事件影响的浅海环境（组合2带）；4280年以来为水深不断变浅的浅海环境（组合3-6带）。CH114孔沉积速率的阶段性变化与河流供给有较好的对应关系：3.6~2.6 ka cal BP和0.4ka cal BP以来两个时段相对较高的沉积速率，分别与黄河三角洲超级叶瓣5的形成和海河独立入海相对应。由硅藻记录的海洋影响的波动变化与全新世气候变化对比显示：研究区海洋影响的增强与气候变暖具有一定的正相关性。CH114孔全新世以来陆海环境的演化，总体上是对气候与海面变化的响应。
基金National Natural Science Foundation of China, No.41030637 Fundamental Research Funds for Central Universities, No.GK200901007
文摘Palaeo-hydrological field investigation was carried out in the middle reaches of the Jinghe River. A set of palaeoflood slackwater deposit beds was identified in the Holocene loess-soil sequence in the riverbanks. The sediment samples were collected from the profile, and the particle-size distribution, magnetic susceptibility, loss-on-ignition were analyzed in laboratory. The analytical results showed that the palaeoflood slackwater deposits have recorded extraordinary flood events in the Jinghe River valley. According to stratigraphic correlation and OSL dating, the palaeoflood events were dated to 4100-4000 a BP. The palaeoflood peak discharges were estimated to be 19,410-22,280 m^3/s by using the hydrological model and checked by different approaches. These results have the flood data sequence of the Jinghe River extended to 10,000-year time-scale. It provided significant data for hydraulic engineering and for mitigation of flood hazards in the Jinghe River drainage basin.
