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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Rock-glacier dams in High Asia
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Rock-glacier dams in High Asia

机译：岩石冰川水坝在高亚洲

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Rock glaciers in semiarid mountains contain large amounts of ice and might be important water stores aside from glaciers, lakes, and rivers. Yet whether and how rock glaciers interact with river channels in mountain valleys remains largely unresolved. We examine the potential for rock glaciers to block or disrupt river channels, using a new inventory of more than 2000 intact rock glaciers that we mapped from remotely sensed imagery in the Karakoram (KR), Tien Shan (TS), and Altai (ALT) mountains. We find that between 5% and 14% of the rock glaciers partly buried, blocked, diverted or constricted at least 95 km of mountain rivers in the entire study area. We use a Bayesian robust logistic regression with multiple topographic and climatic inputs to discern those rock glaciers disrupting mountain rivers from those with no obvious impacts. We identify elevation and potential incoming solar radiation (PISR), together with the size of feeder basins, as dominant predictors, so that lower-lying and larger rock glaciers from larger basins are more likely to disrupt river channels. Given that elevation and PISR are key inputs for modelling the regional distribution of mountain permafrost from the positions of rock-glacier toes, we infer that river-blocking rock glaciers may be diagnostic of non-equilibrated permafrost. Principal component analysis adds temperature evenness and wet-season precipitation to the controls that characterise rock glaciers impacting on rivers. Depending on the choice of predictors, the accuracy of our classification is moderate to good with median posterior area-under-the-curve values of 0.71-0.89. Clarifying whether rapidly advancing rock glaciers can physically impound rivers, or fortify existing dams instead, deserves future field investigation. We suspect that rock-glacier dams are conspicuous features that have a polygenetic history and encourage more research on the geomorphic coupling between permafrost lobes, river channels, and the sediment
机译：半干旱山脉的岩石冰川含有大量的冰，可能是避免冰川，湖泊和河流的重要水商店。然而，无论岩石冰川是否与山谷中的河流渠道相互作用仍然尚未得到解决。我们研究岩石冰川的潜力来阻止或扰乱河流渠道，使用2000多个完整的岩石冰川的新库存，我们从卡拉科姆（kr），天山（Ts）和阿尔泰（Alt）中的遥感图像映射到遥感图像。山脉。我们发现，5％至14％的岩石冰川部分埋没，被阻止，转移或限制了整个研究区内至少95公里的山区。我们使用多种地形和气候投入的贝叶斯稳健的逻辑回归来辨别那些从没有明显影响的人中扰乱山河的岩石冰川。我们识别高度和潜在的传入的太阳辐射（PISR）以及饲养盆的尺寸，作为主要的预测因子，因此来自较大盆地的低洼和较大的岩石冰川更有可能破坏河流通道。鉴于海拔和PISR是为从岩石冰川脚趾的位置建模山地多年冻土区域分布的关键输入，我们推断河流阻断岩石冰川可能是非平衡的永久冻土的诊断。主要成分分析增加了温度均匀度和湿季降水，对照岩石冰川影响河流的控制。根据预测因子的选择，我们的分类的准确性适中，中位后面积曲线值为0.71-0.89。澄清是否迅速推进的岩石冰川可以物理扣除河流，或强化现有水坝，值得未来的现场调查。我们怀疑岩石冰川坝是具有多遗养历史的显着特征，并鼓励更多关于多年冻土，河流渠道和沉积物之间的地貌耦合的研究

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