[论文解读] Techniques, advances, problems and issues in numerical modelling of landslide hazard

Theo van Asch, Jean‐Philippe Malet+2 more|ArXiv.org|Sep 17, 2007

Landslides and related hazards参考文献 153被引用 14

一句话总结

本文综述了滑坡灾害数值模拟技术，重点关注在破坏前、破坏中和破坏后各阶段模拟复杂、时变坡体运动的挑战。文章识别了基于物理机制建模的关键进展，指出了在预测破坏和快速涌流方面持续存在的局限性，并提出了通过整合地貌学和监测数据改进区域灾害预报的路径。

ABSTRACT

Slope movements (e.g. landslides) are dynamic systems that are complex in time and space and closely linked to both inherited and current preparatory and triggering controls. It is not yet possible to assess in all cases conditions for failure, reactivation and rapid surges and successfully simulate their transient and multi-dimensional behaviour and development, although considerable progress has been made in isolating many of the key variables and elementary mechanisms and to include them in physically-based models for landslide hazard assessments. Therefore, the objective of this paper is to review the state-of-the-art in the understanding of landslide processes and to identify some pressing challenges for the development of our modelling capabilities in the forthcoming years for hazard assessment. This paper focuses on the special nature of slope movements and the difficulties related to simulating their complex time-dependent behaviour in mathematical, physically-based models. It analyses successively the research frontiers in the recognition of first-time failures (pre-failure and failure stages), reactivation and the catastrophic transition to rapid gravitational processes (post-failure stage). Subsequently, the paper discusses avenues to transfer local knowledge on landslide activity to landslide hazard forecasts on regional scales and ends with an outline how geomorphological investigations and supporting monitoring techniques could be applied to improve the theoretical concepts and the modelling performance of physically-based landslide models at different spatial and temporal scales.

研究动机与目标

• 评估当前滑坡过程数值建模的最先进技术。
• 识别模拟滑坡时变、多维行为的关键挑战。
• 探讨预测首次破坏、再活化以及向快速流体的灾难性转变的困难。
• 探索将局部滑坡知识有效扩展至区域灾害预报的方法。
• 通过整合地貌学调查和监测数据，改进基于物理机制的模型。

提出的方法

• 系统性回顾现有文献中关于基于物理机制的滑坡建模与数值模拟技术的研究。
• 分析坡体运动在破坏前、破坏中和破坏后各阶段的建模方法。
• 评估地貌学野外调查在验证和优化数值模型中的作用。
• 整合监测数据以提升模型在空间和时间尺度上的校准与预测性能。
• 应用数学模型模拟在不同边界和材料条件下滑坡的瞬态动态行为。
• 评估局部尺度滑坡行为向区域尺度灾害评估的可转移性。

实验结果

研究问题

• RQ1 在数值模拟滑坡时变行为方面，关键挑战是什么？
• RQ2 基于物理机制的模型如何改进首次滑坡破坏和再活化的预测？
• RQ3 滑坡中从缓慢流动到快速重力流的转变由何种机制控制？
• RQ4 如何有效将局部尺度的滑坡观测结果扩展至区域灾害预报？
• RQ5 地貌学和监测数据在何种方式下可提升数值滑坡模型的准确性？

主要发现

• 当前模型在一致预测破坏条件、再活化以及快速涌流发展方面仍存在困难，原因在于准备因素与触发因素之间复杂相互作用。
• 在分离关键变量和机制并将其纳入基于物理机制的模型方面已取得显著进展。
• 从缓慢流动到快速流动的转变仍是建模中最具挑战性的方面之一。
• 整合地貌学野外数据和监测观测对于改进模型校准与验证至关重要。
• 区域尺度灾害预报仍受限于缺乏一致且可扩展的模型，难以整合局部动力学。
• 未来改进依赖于在多个空间和时间尺度上，更好地将基于实地的知识与数值建模框架相结合。