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首页> 外文期刊>Journal of Paleolimnology >A lake sediment-based proxy of floods in the Rocky Mountain Front Ranges, Canada
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A lake sediment-based proxy of floods in the Rocky Mountain Front Ranges, Canada

机译：加拿大落基山前山脉以湖泊沉积物为基础的洪水代理

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摘要

We analyzed lake sediment deposits and local hydrometric records to assess the potential for developing a high-resolution record of sediment delivery from the Rock Lake catchment, situated in the non-glacierized Front Ranges of the Rocky Mountains, Canada. Rhythmic couplets of silt–clay characterized the clastic sediments recovered from the deep central basin of the lake. Contemporary sediment yield to Rock Lake (10.7 ± 1.8 Mg km−2 year−1) is comparable to other studied Canadian Cordillera lakes that have sedimentary lithologies and absence of glacier cover, but distinct rhythmic deposition is relatively unique to this basin. Spatial patterns of deposition within the lake were assessed by correlating rhythmites between multiple sediment cores and by sub-bottom, acoustic profiling. Bracketed dates for a spatially continuous sequence of eight thick rhythmites were established by correlating laminations between core samples collected more than 30 years apart. We identified a consistent pattern between the rhythmite and hydrometric data series between 1975 and 2006 and determined that specific flooding events caused by summer rainstorms are associated with each of the eight thick rhythmites. We observed a good relationship between rhythmite thickness and total flood volume that exceeded a threshold discharge. Acoustic profiling showed that the lake could be a good candidate for longer-term proxy development. We discuss how some of the methods used in this study could benefit ongoing paleoenvironmental assessments based on lacustrine rhythmite series.
机译：我们分析了湖泊沉积物沉积物和当地的水文记录，以评估开发位于加拿大落基山脉无冰川前缘的Rock Lake集水区高分辨率沉积物记录的潜力。有节奏的淤泥-粘土对联是从湖深部中部盆地回收的碎屑沉积物的特征。洛克湖（10.7±1.8 Mg km −2 年 −1 年）的当代沉积物产量可与其他已研究的加拿大Cordillera湖相媲美，这些湖具有沉积岩性和没有冰川覆盖，但是独特的节奏沉积是该盆地相对独特的。通过将多个沉积物核心之间的节律相关联，并通过底部的声学剖面来评估湖泊内沉积的空间格局。通过将间隔30年以上的核心样本之间的层积进行关联，可以确定八个厚节律在空间上连续序列的方括号中的日期。我们确定了1975年至2006年的节奏和水文数据系列之间的一致模式，并确定由夏季暴雨引起的特定洪水事件与这8个厚节奏的节奏都有关联。我们观察到节律厚度与超过阈值排放量的总洪水量之间存在良好的关系。声学分析表明，该湖可能是长期代理开发的良好选择。我们讨论了本研究中使用的某些方法如何使基于湖相节律系列的正在进行的古环境评估受益。

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