Nature friendly hydraulic structures made of natural stones such as ripraps have attracted attention in recent years. However, those structures are subject to failure problem under flood flow. Therefore, the authors proposed tied gravels to increase its stability against flood flow. Coefficients such as the drag and lift force are necessary in designing those structures. However, the authorized values for those coefficients are not established yet, the coefficients used for concrete structures are therefore applied in designing structures made of stones at present condition. This study aims to clarify the drag and lift coefficient for gravels and tied gravels experimentally.
Nature friendly hydraulic structures made of natural stones such as ripraps have attracted attention in recent years. However, those structures are subject to failure problem under flood flow. Therefore, the authors proposed connected stone to increase its stability against flood flow. Coefficients such as the drag and lift force are necessary in designing those structures. However, the authorized values for those coefficients are not established yet, the coefficients used for concrete structures are therefore applied in designing structures made of stones at present condition. This study aims to clarify the drag and lift coefficient for connected stones placed at the middle and upper reach of the bed protection works using connected stones.
Shiro MAENO, Akio TOMITA and Shuhei WAKINO 1 正会員 工博 岡山大学准教授 環境学研究科社会基盤環境学専攻(〒700-8530 岡山市津島中 3-1-1) 2 学生会員 岡山大学環境学研究科社会基盤環境学専攻修士課程(〒700-8530 岡山市津島中 3-1-1) 3 正会員 広島県尾三地域事務所建設局工務第二課(〒723-8520 三原市円一町 2-4-1)Nature friendly hydraulic structures such as a rubble mound weir have attracted attention in recent years. Therefore, it is important to establish an analytical model to analyze the flow around such a porous weir. The aim of this study is to develop a destruction prediction model for the rubble mound weir under a gradual increase of discharge. The VOF (Volume of Fluid) method was used for the flow analysis around and through the rubble mound weir, and the DEM (Distinct Element Method) was used to express the failure process. A proposed VOF-DEM coupled model can feed back the movement of the DEM particles to the flow analysis of the VOF. It is confirmed that the proposed model can reproduce the step by step destruction of the rubble mound weir similar to the experimental results.
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