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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Disentangling human impact from natural controls of sediment dynamics in an Alpine catchment
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Disentangling human impact from natural controls of sediment dynamics in an Alpine catchment

机译：在高山集水区中沉积沉积物动力学自然控制的人体影响

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摘要

Human activities have increasingly strong impacts on the sediment dynamics of watersheds, directly, for example through water abstraction and sediment extraction, but also indirectly through climate change. This study aims at disentangling these impacts on natural sediment fluxes for the Borgne River, located in the Alps of southwest Switzerland, using two approaches: First, an assessment of contemporary sediment sources and their relative contribution to the sediment delivered to the catchment outlet is undertaken by geochemical fingerprinting and a mixing model. Second, a spatially distributed conceptual model of suspended sediment production and transfer is used to quantify the contribution of different portions of the catchment to the total sediment yield. The model describes the influence of hydroclimatic variables (rainfall, snowmelt, and ice melt), water diversions and reservoir trapping on the sediment yield accounting for the erodibility of the different land covers present in the catchment. The analysis of different scenarios based on this conceptual model aids the interpretation of the fingerprinting results and the identification of the most important factors controlling sediment fluxes. Although the conceptual model overestimates the contribution of the downstream source area and underestimates the contribution of the upstream source area, the results allow us to qualitatively assess the impacts of different drivers influencing the sediment yield at the catchment scale. The results suggest: (1) high sediment yield from the uppermost part of the catchment due to sediment delivery by glacial ice me (2) delayed sediment transfer from areas impacted by water abstraction; and (3) reduced sediment contribution from areas upstream of a major hydropower reservoir that intercepts and traps sediment. Although process (1) and processes (2) and (3) serve to counter one another, our study emphasizes that the relative impacts of Anthropocene climate change and human impacts on sediment delivery may be disentangled through multi-proxy approaches. (c) 2019 John Wiley & Sons, Ltd.
机译：人类活动对流域的沉积物动力产生越来越强烈影响，例如通过水抽象和沉积物提取，而且通过气候变化间接地间接。本研究旨在使用两种方法解开位于西南瑞士阿尔卑斯州的Borgne河的自然沉积物偏移的影响：首先，进行了对当代沉积物来源的评估及其对输送到集水区的沉积物的相对贡献。通过地球化学指纹和混合模型。其次，悬浮沉积物生产和转移的空间分布概念模型用于量化集水区不同部分对总沉积物产量的贡献。该模型描述了液压变量（降雨，雪花和冰熔化），水流转和水库捕获对集水区中存在的不同土地覆盖物的肥蚀性沉积物的影响。基于该概念模型的不同情景分析助致对指纹识别结果的解释以及控制沉积物势态的最重要因素的识别。虽然概念模型高估了下游源区的贡献，但低估了上游源区的贡献，但结果允许我们定性地评估不同司机影响沉积物在集水区的影响。结果表明：（1）由于冰川冰熔体的沉积物递送，从集水区的最上部高沉积物产量; （2）延迟沉积物从采用水抽象影响的区域; （3）从截取和捕获沉积物的主要水电站储存器上游的地区降低了沉积物贡献。虽然进程（1）和过程（2）和（3）互相互相抵消，但我们的研究强调，人类气候变化和人类影响对沉积物交付的相对影响可能通过多代理方法解开。 （c）2019 John Wiley＆Sons，Ltd。

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