临界侵蚀风速与植被盖度之间的关系

应用粗糙边界层中阻力分解规律的研究成果,建立了描写临界侵蚀风速与植被盖度之间关系的数学模型。该模型给出：地表土壤的临界侵蚀风速与植被盖度之间呈指数依赖关系,即随着植被盖度的增大,临界侵蚀风速呈指数增加。这一理论结果与实验数据符合良好。在此基础上,定义了理想盖度和警戒线盖度两个概念,并给出了它们在评价环境良好程度和环境破坏程度方面的指示意义。

Relation between Threshod Wind Erosion Velocity and Vegetation Coverage

The authors established a mathematical model between threshod wind erosion velocity and vegetation coverage based on research achievement of the resistance decomposition rule of the rough boundary layer. This model shows that the threshod wind erosion velocity exponentially increases with vegetation coverage, which has a good agreement with the experiment results. Based on this model, the authors have defined two new concepts of ideal coverage and exemplary coverage, further have indicated the important indication significance in the appraisals of environment good degree and the environment destructiveness.