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Laboratory flume experiments on the characteristics of large wood accumulations from debris flow and the backwater rise at slit-check dams
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Laboratory flume experiments on the characteristics of large wood accumulations from debris flow and the backwater rise at slit-check dams
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Journal Article
Laboratory flume experiments on the characteristics of large wood accumulations from debris flow and the backwater rise at slit-check dams
2022
Overview
Large wood is an important component of headwater streams in forested mountain regions and currently considered an important composition of debris flow due to the fact that the most serious disasters are associated with it. The interaction between large wood and debris flow processes can increase the disaster risk by creating an upstream backwater at slit-check dams, decreasing transport capacity, and increasing disaster risk. To better evaluate large wood debris flow hazards in disaster prevention and mitigation, the key influencing factors of backwater rise due to large wood accumulations at slit-check dams were investigated through a series of physical model experiments. We first summarized the characteristics of large wood accumulation and the backwater rise process, and then a characteristic wood volume was cited and extended to debris flow as the volume generating the primary backwater rise. It was additionally observed that sediment concentration and Froude number can affect the characteristics of large wood accumulation and the process of backwater rise. The relative backwater rise increases with the rising sediment concentration and initial Froude number, and the maximum relative backwater rise is 2.15 when sediment concentration is 0.55 and initial Froude number is 2.50. Finally, a revised equation was proposed for estimating the relative backwater rise that accounts for initial condition and large wood characteristic. This study may provide a scientific basis for better understanding and evaluating debris flow disasters containing large wood and the efficient design of the structural height of the slit-check dam to a certain extent.
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