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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Fluvial response to climatic and anthropogenic forcing in the Moselle drainage basin (NE France) during historical periods: Evidence from OSL dating
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Fluvial response to climatic and anthropogenic forcing in the Moselle drainage basin (NE France) during historical periods: Evidence from OSL dating

机译：历史时期摩泽尔流域（法国东北）对气候和人为强迫的河流响应：OSL测年的证据

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The aim of this paper is to study a low energy fluvial system response to natural and anthropogenic forcing during the last two millennia. In contrast with longer timescales (Holocene to Quaternary), historical sedimentary archives are sparse in such systems which are typically characterized by the predominance of erosion compared with aggradation. We studied three main sections in the Moselle valley (northeastern France) by a multi-proxy approach combining morphology, sedimentology, archaeological evidence, historical archives, and dating. The geochronological framework was based on Optically Stimulated Luminescence (OSL) and validated by independent age control. The exposed sediments were allocated to different historical periods from Roman period to present. The first results show that, in contrast with many other fluvial systems, the Moselle and its tributaries did not experience major changes during historical periods. Climatic changes such as the Little Ice Age had a minor influence on floodplain aggradation (e.g. in grain size or sedimentation rates) in the Moselle valley and were only able to affect the fluvial style. This provides evidence that the reworking of sediments is the main fluvial process at short timescales in the valley floors of the Moselle catchment. In contrast, anthropogenic forcing seems important not only during recent centuries but also since Roman times. This is suggested by the case-study of the Metz-Mazelle section where significant headward erosion and sedimentation were recognized, and may be related to human occupation. The results therefore point to a need for increasing geoarchaeological and geochronological research in the Moselle catchment and similar low energy fluvial systems. Such research is actually essential to improve the knowledge of the fluvial response to environmental changes during the historical periods and to recognize the respective influence of natural variability and human forcing.
机译：本文的目的是研究近两千年来低能量河流系统对自然和人为强迫的反应。与更长的时间尺度（全新世至第四纪）相反，此类系统中的历史沉积档案稀疏，通常以侵蚀为主而不是凝结为特征。我们采用形态学，沉积学，考古证据，历史档案和年代学等多种方法研究了摩泽尔河谷（法国东北部）的三个主要部分。地质年代学框架基于光激发发光（OSL），并通过独立的年龄控制进行了验证。从罗马时期到现在，裸露的沉积物被分配到不同的历史时期。最初的结果表明，与许多其他河流系统相比，摩泽尔河及其支流在历史时期没有经历重大变化。气候变化（如小冰期）对摩泽尔河谷的洪泛区聚集（例如粒度或沉积速率）影响较小，仅能影响河流形态。这提供了证据，表明在短时间范围内，摩泽尔河集水区谷底的沉积物再造是主要的河流过程。相反，人为强迫似乎不仅在最近几个世纪而且在罗马时代以来都很重要。梅斯-马泽勒（Metz-Mazelle）断面的案例研究表明了这一点，在该案例中，人们已经认识到重大的前部侵蚀和沉积，并且可能与人类占领有关。因此，结果表明需要在摩泽尔河流域和类似的低能河流系统中增加地质考古和年代学研究。实际上，此类研究对于提高人们对历史时期对环境变化的河流响应的认识以及认识自然变化和人类强迫的各自影响至关重要。

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