ABSTRACT Boulder barricades are poorly documented Holocene coastal landforms of Arctic and Subarctic regions. To understand the terrain factors and coastal processes explaining the occurrences of boulder barricades, we mapped and described these periglacial landforms along the emerging hypertidal coast of Ungava Bay, in Nunavik, northern Quebec, Canada. This study examines the spatial distribution as well as the different types and configurations of boulder barricades, and identifies and discusses the formation processes of these ridges, which are affected by the ongoing glacial isostatic adjustment (GIA) process. We distinguish four types of ice-formed boulder ridges: low-tide-, intertidal-, high-tide- and raised boulder barricades. Our results highlight the importance of specific terrain factors (coastal configurations, intertidal and backshore slopes, widths of intertidal zones, susceptibility to coastal erosion) and related coastal processes (ice-pushing and ice-rafting intensified by strong tidal currents), forming these different types of barricades. Due to the GIA process, this coastal region is characterized by a large number of evolutionary sequences (i.e. flights) of boulder barricades, from the intertidal zone to the emerged landscape. These sea-ice-related landforms have significant effects on the coastal geomorphology of the Ungava Bay region by successively enclosing and isolating many ponds and lakes.

中文翻译：

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新兴潮汐环境中的巨石路障：加拿大魁北克北部 Ungava 湾的案例

摘要巨石路障是北极和亚北极地区的全新世海岸地貌记录很少。为了了解解释巨石路障发生的地形因素和沿海过程，我们绘制并描述了加拿大魁北克北部努纳维克 Ungava 湾新兴的潮汐沿岸的这些冰缘地貌。本研究检查了巨石路障的空间分布以及不同类型和配置，并识别和讨论了这些山脊的形成过程，这些过程受到正在进行的冰川均衡调整 (GIA) 过程的影响。我们区分了四种类型的冰形成的巨石脊：低潮、潮间带、高潮和凸起的巨石路障。我们的结果强调了特定地形因素（沿海配置、潮间带和背岸斜坡、潮间带宽度、对海岸侵蚀的敏感性）和相关的海岸过程（强潮流加剧的推冰和漂冰），形成了这些不同类型的路障。由于 GIA 过程，这个沿海地区的特点是从潮间带到出现的景观，有大量巨石路障的进化序列（即飞行）。这些与海冰有关的地貌通过相继封闭和隔离许多池塘和湖泊，对安加瓦湾地区的海岸地貌产生了重大影响。这个沿海地区的特点是大量的巨石路障演化序列（即飞行），从潮间带到出现的景观。这些与海冰有关的地貌通过相继封闭和隔离许多池塘和湖泊，对安加瓦湾地区的海岸地貌产生了重大影响。这个沿海地区的特点是大量的巨石路障演化序列（即飞行），从潮间带到出现的景观。这些与海冰有关的地貌通过相继封闭和隔离许多池塘和湖泊，对安加瓦湾地区的海岸地貌产生了重大影响。