[Objective] The flume simulation research on wave prevention and sand stabilization counter measures for coral sandy coastlines were studied in order to provide a theoretical basis for the project to protect coastlines against wave erosion along the Dengloujiao shoreline

located in the Xuwen National Coral Reef Nature Reserve on the Leizhou Peninsula

and to provide technical support for similar coastal areas. [Methods] The coastal erosion protection effect of san-dbag barrier measures was determined for the Dengloujiao coastline using a flume experiment simulation method. [Results] ① The composite effect of the overall structure of the diamond-shaped sand-bag barrier had a significant impact on the stability of the sand barrier. Two groups of sand barriers with a diameter of 5 cm or above was able to achieve self-stability. Calculated according to the gravity similarity criterion

this was equivalent to 50 cm diameter of the prototype; ② The sand-bag barrier achieved sediment fixation by increasing the roughness of the bed surface

weakening the hydrodynamic strength

and thereby reducing the intensity of sediment transport. As the diameter of the sand barrier increased

its shielding effect became more significant; ③ For a wave period of 1.90 s and a water depth of 0.4 m

the height of sand ridges observed in the experiment were 3-4 cm. Therefore

in practical projects

sand barriers with a diameter of 50 cm or more can prevent and control the migration of sand waves and sand ridges; ④ The sand barrier arranged in a diamond shape was less affected by oblique waves and had better stability than the sand barrier arranged in a normal direction. Therefore

it is advisable to use a diamond-shaped sand barrier to reduce the effect of oblique waves. [Conclusion] The use of sand-bag barriers as protective materials for coastal erosion not only achieved the goal of sand control

but also produced favourable ecological and environmental protection effects. These results could provide important scientific guidance and have significant and practical promotion value.