Scholarlink

<p>Glacial lakes store hundreds to millions of cubic metres of water, but are commonly impounded by unconsolidated, loosely packed moraine dams. Here we present a numerical modelling approach to evaluate dam stability, using limit equilibrium analyses (Geostudio SEEP/W) to generate look-up tables that describe a factor of safety (FoS) under various conditions. We find that in steady-state, an idealised moraine slope may be considered stable (FoS ≥ 2) and that peak ground accelerations greater than 0.5 g are required to induce failure (FoS &lt; 1). We also find that rockslope failures must be substantial (&gt;250,000 m<sup>3</sup>), falling into deep water (&gt; 100 m), and within 500 m of the dam crest, to generate an initial overtopping wave &gt; 10 m. We apply these outputs to four moraine dams in High Mountain Asia to provide a framework for practitioners to use when assessing glacial lake hazards, based solely on geometric and seismic parameters.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A practical approach to assessing moraine dam stability in High Mountain Asia

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月8日

查看全文
  • D. J. Quincey,
  • D. Y. K. Chan,
  • J. T. Gelder,
  • K. Quincey,
  • R. E. Stevenson,
  • T. Vasconi

摘要

Glacial lakes store hundreds to millions of cubic metres of water, but are commonly impounded by unconsolidated, loosely packed moraine dams. Here we present a numerical modelling approach to evaluate dam stability, using limit equilibrium analyses (Geostudio SEEP/W) to generate look-up tables that describe a factor of safety (FoS) under various conditions. We find that in steady-state, an idealised moraine slope may be considered stable (FoS ≥ 2) and that peak ground accelerations greater than 0.5 g are required to induce failure (FoS < 1). We also find that rockslope failures must be substantial (>250,000 m3), falling into deep water (> 100 m), and within 500 m of the dam crest, to generate an initial overtopping wave > 10 m. We apply these outputs to four moraine dams in High Mountain Asia to provide a framework for practitioners to use when assessing glacial lake hazards, based solely on geometric and seismic parameters.