渤海湾海岸古气候环境及其对海岸变迁的影响

Research of paleoenvironment and its impact oncoastline evolvement in Bohai Bay

以渤海湾西岸这一典型淤泥质海岸为背景,从研究古气候环境出发,利用相关考古资料和前人的成果,重建渤海湾西岸全新世以来的气候环境,得到渤海湾的气候变化情况.通过分析孢粉化石资料,初步恢复渤海湾地区4个特征位置的古气候、古环境.针对渤海海域水环境,建立距今2 500～2 000年前、距今1 000年前和公元2004年的渤海二维潮流数学模型,通过分析流场变化构建出从古至今海岸变迁演变过程(冲淤演变).研究古气候环境变化与海岸变迁的关系,探索古气候环境影响下的海岸变迁的内因和外延,综合古气候变化、海平面变化等影响因素,总结得出渤海湾海岸古气候环境(温度、降水、潮流风浪等)对海岸变迁的影响,并对未来海岸线的变化趋势进行预测.

Based on the fact that the west coast of Bohai Bay is a typical muddy coast, paleoclimate and paleoenvironment are both studied. This paper makes an analysis of the pollen fossil according to the relevant archaeological data and related research results of Bohai Bay region and makes a preliminary reconstruction of paleoclimate of the region since Holocene, then the climate changes are obtained. This paper makes an analysis of the pollen fossil of Bohai Bay region and makes a preliminary recovery of four typical locations＇ paleoclimate and paleoenvironment of the region. This paper establishes a tide mathematical model of the Bohai Bay region under three different periods： AD 2004, 1128 B.P. and 2500 B.P.. At first, the mathematical model is proved reliable by the comparison of the measured data and the model test data of the 2004 model. Thus, numerical models of the other two conditions can be built. And then, this paper makes a comparison and analysis of the characteristics of the rising tide, ebb rush of three models. Finally, this paper studies the relationship between the paleoclimate changes and coastline evolution, explores the internal and external reasons of the coastline evolution under the influence of climate changes, analyzes the evolvement of the coastline based on the climate changes, sea-level changes and other factors, thus gets a conclusion of the influences paleoclimate and paleoenvironment bring to coastline evolvement and predicts the trend of coastline changes in the future based on the rules obtained in this paper.