Imprints of Rapid Climate Changes and human activity on Holocene hydro-sedimentary dynamics in Central Europe (loess-covered Weiße Elster model region)

在中欧次大陆，韦伯·埃尔斯特模型区揭示了一个黄土覆盖的流域，其特点是对全新世水文气候变化具有高度的河流地貌敏感性。这从韦伯-埃尔斯特泛滥平原岩性地层学中的多个水平层状土壤-沉积物序列中可以看出。我们假设，韦伯-埃尔斯特泛滥平原显示了保存全球快速气候变化(RCC)的极高潜力。我们的目标是首次在中欧河流年代地层记录中检测RCC信号。一个可靠的年代学模型将主要基于OSL测年。洪水的漫滩沉积阶段和冲积土壤形成阶段将与数百年来的RCC记录进行系统的比较，以确定洪水动态和气候之间的可能联系。在黄土覆盖的韦伯-埃尔斯特流域内，新记录的堆积层序将被用作全新世期间可能的人类影响的代用品。我们将通过调查这两种档案的夹层带，在地层上将韦伯·埃尔斯特河和堆积记录联系起来。这可以更好地指示河流和堆积子系统的水-沉积耦合或去耦合，从而更好地了解可能的内部门限和沉积瀑布。在韦伯-埃尔斯特流域，我们的目标是首次重建从新石器时代早期到中世纪晚期人类占领和土地利用的连贯和历时的考古和历史数据集。考古重建将基于萨克森、萨克森-安哈尔特和图林根州三个考古州部门已公布的考古和历史数据、实地报告、现有历史数据库和地理信息系统数据集的汇编。对于选定的具有代表性的韦伯·埃尔斯特子盆地，我们的目标是重建高分辨率、连贯和历时的考古和历史数据集，其中包括已知文物、结构和遗址的空间分布以及书面资料中记录的土地使用情况。为此，将系统地重新分析所有相关来源。我们将以半定量的方式对不同的土地利用强度进行评估。考古和历史替代数据与地貌丘陵-泛滥平原年代地层学的结合将被用来评估韦伯-埃尔斯特流域内土地利用和泥沙再沉积的历时相互作用。最后，我们的目标是按时间顺序和半定量比较快速气候变化和脆弱的韦伯-埃尔斯特山坡-泛滥平原系统内人类活动的可能印记。重建的关于气候和人类影响的地貌脆弱性和阈值应能在了解中欧高度敏感的黄土覆盖地貌的复杂和非线性全新世水文沉积动力学方面向前迈进一步。

In sub-continental Central Europe the Weiße Elster model region reveals a loess-covered drainage basin that features a high fluvio-geomorphological sensitivity towards Holocene hydro-climatic shifts. This is indicated by multiple, horizontally bedded soil-sediment sequences within the Weiße Elster floodplain lithostratigraphy. We postulate that the Weiße Elster floodplain reveals an extraordinary high potential to preserve global Rapid Climate Changes (RCCs).For the first time we aim to detect RCC signals in a Central European fluvio-chronostratigraphical record. A robust chronological model will predominantly base on OSL dating. Flood phases with overbank deposition and phases of alluvial soil formation will be systematically compared with multi-centennial-scale RCC records to detect probable linkages between flood dynamics and climate. Within the loess-covered Weiße Elster drainage basin newly recorded colluvial sequences will be used as proxies for a probable human impact during the Holocene. We will stratigraphically link Weiße Elster fluvial and colluvial records by surveying the intercalation zones of both kinds of archives. This allows a better indication of the hydro-sedimentary coupling or de-coupling of fluvial and colluvial sub-systems, and thus a better understanding of probable internal thresholds and sedimentary cascades.Within the Weiße Elster drainage basin we aim to reconstruct for the first time a coherent and diachronic archaeological and historical data set of human occupation and land use from the Early Neolithic until the High Middle Ages. The archaeological reconstruction will base on the compilation of published archaeological and historical data, field reports, available historical databases and GIS datasets of the three archaeological state departments in Saxony, Saxony-Anhalt and Thuringia. For selected, representative Weiße Elster sub-basins, we aim to reconstruct high-resolution coherent and diachronic archaeological and historical data sets of the spatial distribution of known artefacts, structures and sites as well as documented land use in written sources. To do so, all relevant sources will be systematically re-analysed. We will evaluate different land use intensities based on a semi-quantitative approach. The coupling of archaeological and historical proxy data with geomorphological hillslope-floodplain chronostratigraphies will be used to evaluate the diachronic interaction of land use and sediment re-deposition within the Weiße Elster drainage basin. Finally, we aim to compare chronologically and semi-quantitatively probable imprints of Rapid Climate Changes and human activity within the fragile Weiße Elster hillslope-floodplain system. Reconstructed geomorphological vulnerabilities and thresholds regarding climatic and human impacts should allow a step forward in understanding complex and non-linear Holocene hydro-sedimentary dynamics of highly sensitive loess-covered landscapes in Central Europe.