Ebinur surrounding shrub ( grass ) plexus sand tunnel research and development mechanism
|School||Xinjiang Normal University|
|Keywords||Irrigation ( grass ) plexus sand Slope Coverage Wind tunnel experiments Aibi|
Irrigation (grass) plexus sand deserts are arid and semiarid regions, semi-moist sand and sandy coastal biological common aeolian landforms. Irrigation (grass) study in the sand sand Cong geomorphology, land desertification monitoring and evaluation, and other aspects of the evolution of regional environmental significance. In this paper, a typical shrub around Ebinur (grass) plexus sand as the research object to sand geomorphology, sand physics, plant ecology and other disciplines theory as a guide, in the wild on the sand for sand shrub and geomorphology botany investigation, based on the development carried out to clarify the dynamic mechanism of sand wind tunnel simulations. In this paper, the structure of the flow field nebkhas tunnel comprehensive analysis of simulation results, preliminary conclusions are as follows: 1, Sink (grass) plexus sand slope changes on the sand flow structure significantly affected. Sandpile sandpile slope changes on the flow field structure differences mainly in the airflow acceleration windward and leeward areas eddy. 2, tamarisk plant sand permeability changes in conditions on the sand flow structure significantly affected. In Tamarix sand on the leeward slope, permeability small tamarisk sand leeward flow field develops into leeward strong vortex area, and permeability big tamarisk sand leeward flow field develops into leeward weak eddy; while Plants permeability changes on the sand windward flow acceleration region less affected, only in the wind is weak, the impact of the flow structure is more obvious. 3, white sand plant thorn permeability changes in conditions Nitraria sand flow structure is not significant. Airflow permeability in good condition through the sand Nitraria flow field, in the sand windward acceleration region occurred before climbing a small range reflection vortex structure; leeward strong vortex in the vortex zone scope, only the center of the vortex zone thickness and permeability breadth than poor white thorn sand. 4, changes in vegetation cover, sand flow structure characteristic difference is mainly manifested in the sand airflow acceleration windward leeward areas and sand vortex area. Windward slope in the sand flow acceleration region, with the white sand thorn coverage gradually increased, reflecting the sand before the windward vortex becomes more obvious, and the scope of vortex area significantly increased; leeward vortex in the sand area, with the leeward the white thorn coverage increases, the degree of vegetation cover change on the leeward strong eddy in thickness and breadth of change is not obvious; but eddy flow intensity changes within the obvious impact. 5, tamarisk sand and white sand thorn in the flow field structure there are significant differences. Windward slope in the sand flow acceleration region, tamarisk sand flow vortex formation sand windward acceleration region, while the white thorn sand flow field is formed to windward slope uphill acceleration region; tamarisk sand flow structure is formed in plant coverage area , white sand thorn no; strong vortex in the leeward areas, tamarisk sand leeward vortex zone is much larger than the white thorn sand leeward eddy.