Long-term dynamics of sediment and their potential indication for debris flow initiation in Wenchuan seismic area

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-05-19 DOI:10.1007/s10064-025-04310-2

Wen Zhang, Wankun Li, Chen Cao, Shengyuan Song, Junqi Chen, Han Yin, Zongshuo Zhang

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引用次数: 0

Abstract

The occurrence of debris flows depends on the combined effects of the distribution and volume of loose source materials and rainfall intensity, especially in seismic regions where sediment undergoes prolonged evolution and migration. Conventional monitoring and warning methods often overlook the influence of long-term sediment dynamics on debris flow initiation due to limitations in capturing sustained sediment changes across entire catchments. This study proposes the innovative utilization of small baseline interferometric synthetic aperture radar (SBAS-InSAR) technology to investigate sediment evolution before debris flows. SBAS-InSAR enables long-term and periodic monitoring at the catchment scale, offering insights beyond short-term observations during triggering rainfall events. By analyzing erosion and deposition processes in a seismic catchment, this study reveals the gradual transition of bank sediment into channel sediment over several years after an earthquake and identifies sustained channel sediment erosion preceding debris flow initiation. Using time-series analysis and physical model experiments, the study establishes a connection between long-term sediment dynamics and debris flow generation. The findings demonstrate that SBAS-InSAR provides an effective means for all-weather monitoring of sediment evolution over large spatiotemporal scales, enhancing the understanding of debris flow generation processes in seismic regions.

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汶川地震区沉积物长期动力学特征及其泥石流起爆的潜在指示

泥石流的发生取决于松散物源的分布和体积与降雨强度的综合作用，特别是在沉积物经历长期演化和迁移的地震带。传统的监测和预警方法往往忽略了长期泥沙动力学对泥石流发生的影响，因为在捕捉整个流域的持续泥沙变化方面存在局限性。本研究提出创新利用小基线干涉合成孔径雷达（SBAS-InSAR）技术研究泥石流前沉积物演化。SBAS-InSAR能够在流域尺度上进行长期和定期监测，在触发降雨事件期间提供超越短期观测的见解。通过分析地震流域的侵蚀和沉积过程，本研究揭示了地震后数年内河岸沉积物逐渐转变为河道沉积物，并确定了泥石流发生前持续的河道沉积物侵蚀。通过时间序列分析和物理模型实验，建立了长期泥沙动力学与泥石流生成之间的联系。研究结果表明，SBAS-InSAR为大时空尺度上的沉积物演变提供了一种有效的全天候监测手段，增强了对震区泥石流形成过程的认识。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.