Study On The Relationship Between Animal Burrowing And Sandy Patches In Shapotou Sand Fixation Area And Its Control

Sand patches has occurred on the sandy land that has undergone 60 years of sand prevention and fixation.Dune activation refers to the transformation of fixed/semi fixed sand dunes into mobile sand dunes.At present,there is a lack of systematic research on the issue of this protective system,especially the role of animals in it.This study explores the impact of animal burrowing behavior on the formation of sandy patches.Using drone remote sensing to identify animal caves and calculate their distribution.Accurately grasp the spatial distribution of caves in the experimental site.Wind tunnel simulation experiments were conducted on animal caves in the experimental plot to determine sediment transport and erosion volume,revealing the impact of animal burrowing activities on wind erosion.A new type of sand fixation barrier,the Tribulus shield mobile sand fixation barrier,has been invented to control sandy patches,and its wind tunnel simulation experiments have been conducted on its ability to prevent wind and sand.(1)Conduct in-situ wind tunnel experiments on animal caves in the field.The results indicate that no significant wind erosion occurs at a wind speed of 9 m/s,regardless of whether there are animal caves or not.As the wind speed increases to 12 m/s and 15 m/s,the sediment transport in the sample plots with animal cave deposits is significantly greater than that in the sample plots without animal burrowing damage.The wind erosion drilling experiment shows that after high wind speed erosion,there is no obvious wind erosion phenomenon on the same land.However,in the sample land damaged by animal burrowing,the cave accumulation body serves as a sand source,causing obvious wind erosion phenomenon,with a depth of up to 4.20 cm.(2)In order to control the sandy patches caused by animal caves,a new type of movable,combinable,and mechanically woven sand fixing barrier called the Tribulus shield mobile sand fixing barrier has been invented.The wind speed flow field,wind sand flow structure and sediment transport characteristics of this sand barrier have been studied and analyzed.The results indicate that the velocity of the airflow decreases when passing through the shield like moving sand fixation barrier of the Tribulus terrestris,forming a clear deceleration zone.At 6 m/s,the deceleration settlement zone reaches 20 H;As the wind speed increases,the deceleration settlement zone narrows.At 10 m/s and 14 m/s,the deceleration settlement zone is 15 H;And at 18 m/s,it can also maintain a deceleration settlement zone of 15 H.A blow erosion experiment was conducted on the shield shaped mobile sand fixation barrier of Tribulus terrestris.The results showed that under three wind speed gradients,the average sediment transport of the new type of shield shaped mobile sand fixation barrier was 13.8%(10 m/s wind speed),21.1%(14 m/s wind speed),and 23.4%(18 m/s wind speed)without sand barriers.The structurally complete and larger diameter tribulus shield shaped mobile sand fixation barrier has the best wind and sand prevention effect.Comprehensive research has shown that animal caves and their accumulations provide a source of sand for the occurrence of wind erosion.The behavior of animal burrowing leads to intensified wind erosion,which is an important factor leading to the sandy patches.At the same time,as a targeted prevention and control measure,the movable biomimetic sand fixation barrier of the Tribulus terrestris shield has good wind and sand prevention effects,and has broad application prospects in the field of desertification prevention and control.