Holocene evolution of an irregularly sinking coast: the interplay of eustasy, neotectonics and sediment supply

不规则下沉海岸的全新世演化：海平面运动、新构造运动和沉积物供应的相互作用

• 批准号: 5404419
• 负责人: Regine Ziekur
• 金额: --
• 依托单位: Leibniz-Institut für Angewandte Geophysik (LIAG)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2004-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5404419?language=en
• 关键词: Holocene; evolution; irregularly; sinking; coast

The target of the research is the development of a consistent space-time-model of the evolution of the southern Baltic coast between Trave river and the Oder lagoon. The investigations focus on the period from 8000 calendar years BC to the present, i.e. on the time since the onset of the Litorina transgression. In three time slices the course of the relative sea-level rise, the proportions of eustatic and neotectonic components, the character, magnitude and periodicity of sea-level oscillations and the temporal distribution of storm flood deposits (tempestitic layers) have to be investigated from radiocarbon dated sediment cores. The focus is on sites characterized by different rates of submergence, which enables to develop local shoreline displacement curves with varying portions of neotectonic movements. Conclusions about the stationarity of these processes, the temporal distribution of flood events and the climate driven changes of the coastal landscape will be the result. The facies architecture of the main Holocene coastal structures as spits, barrier spits, sand planes, and lagoons has to be identified by means of drilling and geophysical methods. This allows the three dimensional modelling of the coastal structure and the calculation of its volume with geostatistical methods for particular points of time. Relating these volumes to different phases of the sea-level oscillations and their extent should provide new insights about the provenience of the material, the rates of morphological change and allows - in parts and depending on climate predictions - conclusions how the coast will change in the future.

该研究的目标是发展一个一致的时空模型的特拉夫河和奥得湖泻湖之间的波罗的海南部海岸的演变。调查的重点是从公元前8000日历年到现在，即从Litorina海侵开始的时间。在三个时间片的相对海平面上升的过程中，海平面和新构造成分的比例，海平面振荡的特点，幅度和周期性和暴雨洪水沉积物（风暴层）的时间分布必须从放射性碳定年的沉积物芯进行调查。重点是以不同淹没率为特征的场地，这使得能够开发具有不同新构造运动部分的当地海岸线位移曲线。这些过程的平稳性，洪水事件的时间分布和气候驱动的沿海景观变化的结论将是结果。主要的全新世海岸结构的相结构，如沙嘴，障壁沙嘴，砂平面，泻湖必须通过钻井和地球物理方法来确定。这使得三维建模的沿海结构和计算其体积的地质统计方法的特定时间点。将这些体积与海平面振荡的不同阶段及其程度联系起来，应该可以提供有关材料来源的新见解，形态变化的速率，并允许-部分地并取决于气候预测-得出海岸未来将如何变化的结论。