本研究於苗栗縣三義鄉火炎山一號坑，藉由建立現地監測影像進行土石流運動特性分析，包括土石流流動歷程、地貌變化、土石流平均速度及各斷面坡度與高程分析。本研究彙整 2016 年至2022 年間各土石流事件之降雨資料，有效累積雨量(含前期降雨)與土石流流動距離之間具有高度關聯性。為探究火炎山現地因崖錐堆積及溪床土石堆積受降雨引發土石流之流動歷程與逕流相關特性，本研究於室內實驗水槽進行逕流啟動實驗。在不同底床配置高度中，分析流量及坡度的條件下，顆粒之流動型態、顆粒流運動特性、堆積體破壞歷程及水流功率與堆積體破壞後各參數間之相關性。;This study was conducted at the No.1Gully of Houyenshan in Sanyi Township, Miaoli County. The research focused on analyzing the characteristics of debris flow movement, including the flow process, geomorphic changes, average velocity, and cross-sectional analysis, by establishing on-site monitoring images. To investigate the debris flow movement process and the characteristics related to rainfall-induced debris flows in the local area, the study compiled rainfall data from various debris flow events between 2016 and 2022. There was a significant correlation between the accumulated effective rainfall (including antecedent rainfall) and the distance of debris flow movement. To further explore the debris flow movement processes and runoff-related characteristics caused by cliff cone accumulation and streambed sediment accumulation at Houyenshan, small-scale indoor experiments were conducted using a flume. The experiments were carried out with different bed configurations, analyzing the flow patterns of particles, particle movement characteristics, the process of deposit disruption, and the correlations among stream power and various deposit parameters.
