To have a thorough understanding of the soil erosion behavior of tangential flows in revetments, this erosion testing was conducted using tangential flow erosion equipment and two types of geotextiles in different apparent opening sizes and included a series of indoor tests in different phases of the velocity of flow in line with the combinations of gravels in different sizes and soil. During the testing, changes in turbidity and flow were recorded in a synchronous manner and those in the testing tank in each phase of the velocity of flow were observed to learn the erosion behavior in each test combination. After the testing, soil worn away by the erosion was collected for particle size testing and analysis to understand the mechanisms of soil erosion. Testing results show that both critical and failure flow velocities tended to increase as parameters such apparent opening size, gravel porosity and size decreased; in addition to soil retention by the woven textiles, the gravels also retained the soil flushed out of the woven textiles by the water flows and acted as the second protection; and the soil carried by the flows into the water tank was mostly in a size of less than #200 mesh while that retained by the gravels was mostly in a size of #100 mesh.
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