Identification of the complete particle size distribution of landslide debris by the combined method of scaled image analysis, line-grid analysis and laboratory sieve analysis

IF 3.8 Q2 ENVIRONMENTAL SCIENCES Geoenvironmental Disasters Pub Date : 2024-02-15 DOI:10.1186/s40677-024-00270-z
Sandaruwan Karunarathna, Satoshi Goto, Sajith Bandaranayake, Priyantha Bandara
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Abstract

Ground failures in a slope due to gravity, are commonly known as landslides. Depend on the compositional, geological, and structural characteristics of the unstable initiation zone and the erosional composition of the propagation zone decide the complete particle size distribution of the moving mass and its gradation. This information is most important for the study of downslope movement. Only laboratory sieve analysis cannot fulfil this target because the natural debris contains a wide range of particle sizes, especially boulders. The combined method of scaled image analysis and laboratory sieve analysis or the combined method of line-grid analysis and laboratory sieve analysis was proposed to fulfil the requirement. To study the proposed combined methods, five different locations within the downslope propagation zone from the Aranayake landslide in Sri Lanka were surveyed and analyzed. In image analysis, the high-resolution scaled image of deposited debris was analyzed by computer-based image analysis for particle sizes. Small particles were addressed by the laboratory sieve analysis using the representative debris sample taken from the same location. If the boulder sizes within the debris are too big to address this method, then the Line-grid method was performed. The particles in every 0.5 m along a measured line of debris deposition were measured in this method. If the selected location contains small particles that cannot measured manually, the representative sample was used for the laboratory sieve analysis to fulfil this range. The results of three locations indicated a 40% distribution of < 10 mm and a 60% distribution of > 10 mm representing the general distribution of the debris. Two distributions deviated from the general distribution that was surveyed and analyzed from special locations of the “near boundary of flow path” and “slope change zone” of the landslide. The combined methodology yielded successful results of complete particle size distribution for the wide range of particle sizes in debris. The variation of the particle size distribution curves of debris along the downslope depositions is planned to be used for the study of downslope propagation, damage zone assessment studies, and predicting the representative composition of future failures.
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通过缩放图像分析、线栅分析和实验室筛分分析的综合方法确定滑坡碎屑的完整粒度分布
由于重力作用,斜坡上的地面塌陷通常被称为滑坡。不稳定起始区的成分、地质和结构特征以及传播区的侵蚀成分决定了移动体的完整粒度分布及其分级。这些信息对于研究下坡运动最为重要。仅靠实验室筛分分析无法实现这一目标,因为天然碎屑含有多种粒度,尤其是巨石。为满足这一要求,提出了比例图像分析和实验室筛分分析相结合的方法,或线-网格分析和实验室筛分分析相结合的方法。为了研究建议的组合方法,我们对斯里兰卡 Aranayake 滑坡下坡传播区内的五个不同地点进行了勘测和分析。在图像分析方面,通过基于计算机的图像分析,对沉积碎屑的高分辨率缩放图像进行颗粒大小分析。小颗粒则通过从同一地点提取的具有代表性的泥石样本进行实验室筛分分析。如果碎屑中的巨石尺寸过大,无法用这种方法处理,则采用线-网格法。在此方法中,沿碎片沉积测量线每隔 0.5 米测量颗粒。如果所选地点含有无法人工测量的小颗粒,则使用具有代表性的样本进行实验室筛分分析,以满足这一范围的要求。三个地点的结果表明,10 毫米的分布占 40%,代表了碎片的总体分布。在滑坡的 "流道近边界 "和 "斜坡变化区 "的特殊位置进行的调查和分析显示,有两个分布偏离了总体分布。综合方法成功地得出了碎屑中各种粒径的完整粒径分布结果。计划将碎屑粒径分布曲线沿下坡沉积的变化用于下坡传播研究、破坏区评估研究以及预测未来崩塌的代表性成分。
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来源期刊
Geoenvironmental Disasters
Geoenvironmental Disasters Social Sciences-Geography, Planning and Development
CiteScore
8.90
自引率
6.20%
发文量
22
期刊介绍: Geoenvironmental Disasters is an international journal with a focus on multi-disciplinary applied and fundamental research and the effects and impacts on infrastructure, society and the environment of geoenvironmental disasters triggered by various types of geo-hazards (e.g. earthquakes, volcanic activity, landslides, tsunamis, intensive erosion and hydro-meteorological events). The integrated study of Geoenvironmental Disasters is an emerging and composite field of research interfacing with areas traditionally within civil engineering, earth sciences, atmospheric sciences and the life sciences. It centers on the interactions within and between the Earth''s ground, air and water environments, all of which are affected by climate, geological, morphological and anthropological processes; and biological and ecological cycles. Disasters are dynamic forces which can change the Earth pervasively, rapidly, or abruptly, and which can generate lasting effects on the natural and built environments. The journal publishes research papers, case studies and quick reports of recent geoenvironmental disasters, review papers and technical reports of various geoenvironmental disaster-related case studies. The focus on case studies and quick reports of recent geoenvironmental disasters helps to advance the practical understanding of geoenvironmental disasters and to inform future research priorities; they are a major component of the journal. The journal aims for the rapid publication of research papers at a high scientific level. The journal welcomes proposals for special issues reflecting the trends in geoenvironmental disaster reduction and monothematic issues. Researchers and practitioners are encouraged to submit original, unpublished contributions.
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