Based on physical model test and analysis of hydraulic erosion of warping dam

As a common engineering measure in “Gully consolidation and highland protection” project, warping dam plays a great role in soil and water conservation in the loess Plateau region. This paper selects the Yangjiagou small watershed in Qingyang City, Gansu Province as the research object, sets up a warping dam to simulate erosion reduction, and establishes a physical channel model with equal scale reduction, to reveal the reciprocal feeding mechanism of hydraulic erosion to the “Gully consolidation and highland protection” project. According to experimental calculations, the total erosion amount of the three erosion tests before the construction of the warping dam is 7.25kg, 8.02kg and 9.20kg, and the total erosion amount of the three erosion tests after the construction of the silt dam is 4.51kg, 5.25kg and 6.18kg. The sand interception efficiency in the three water flushing tests is 37.8%, 34.5% and 32.8%. The results show that the construction of warping dam can raise erosion base level and alleviate soil erosion effectively. And the warping dam can still play a part of its sediment reduction capacity after it has been scoured several times and partially destroyed. With the increase of use time, the effectiveness of the warping dam for blocking sand gradually decreases.

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