摘要
根据中国沿海26个验潮站资料,计算了海平面年平均值,并用最小二乘法求得年平均升降速率。研究发现,在近百年来世界气候变暖、海面普遍有所升高的情况下,中国北方海平面出现普遍下降,南方海平面普遍升高。认为这种差异变化,除了气候等因素以外,主要取决于地壳动力学方面的因素。作者进一步结合现今地应力场和相邻板块活动情况及中国大陆块体变化、深部地幔物质上涌等地壳动力学问题进行了较详细的分析研究。结果表明,中国东部沿海南升北降的海平面变化格局与周围板块向大陆的推挤有因果关系,并指出北方地质块体稳定性差、富柔性;南方块体较稳定、富刚性,形变甚微。这是南北海平面变化不同的内在因素。根据上述分析,对海面变化趋势及其危险性进行了初步评估,并重点结合塘沽一带渤海实际情况提出了自己的认识。
Based on the data from 26 tidal observatories on China coast,the value of annual sea level off China coast is calculated and the annual changing rate of the sea level is obtained using least square method. It is discovered that sea level off north China coast shows a tendency of descending while that off south China coast a tendency of ascending against the background of the warming up of global climate and the rising of global sea level during the past century. It is advanced that such variations are mainly caused by crust dynamic agents,apart from the climatic effects. Analysis of modern earth stress field, activities of tectonics, deformation of China continent body, rising of lower mantle matter and other crust dynamic problems indicates that the varying configuration of ascending and descending sea level off China coast have a causal relationship with the crush and pressure of surrounding tectonics. The intrinsic factors that lead difference of sea level variances off China are that geological body in north China is comparatively more tender and less stable but in south China more rigid and less deformable. A prediction is forwarded in the light of the analysis on the tendency of sea level variation and the possible ensuing hazards in future,with the status of sea level around Tanggu Station of Bohai Bay is tackled.
出处
《海洋通报》
CAS
CSCD
北大核心
1994年第3期31-41,共11页
Marine Science Bulletin
关键词
升降速率
地壳动力学
海平面变化
sea level changing rate
relationship
crust dynamics
tectonics
earth stress field
China waters
