森林枯落物影响花岗岩风化沙粒起动流速研究

Study on the Impact of Forest Litter on Initial Motion Velocity of Sand Particles of Weathered Granite

运用室内水槽实验方法，对无粘性均匀花岗岩沙粒的起动流速和马尾松林枯落物对其起动流速的影响进行了研究，结果表明：沙粒起动流速与沙粒平均粒径、坡度和枯落物量之．间存在明显的幂函数关系，枯落物与苔藓组合层对沙粒起动流速的影响比仅枯落物层时更明显。粒径大于２．０ｍｍ的沙粒当有枯落物覆盖时，即使在３５°的坡度条件下也很难起动。

Basedon experiment of weter tank, study on initial motion velocity of the unsticked uniform Granite sand particles and impact forest litter of masson pine on the initial motion velocity is conducted. The results indicate that the exponential relation is quite obvious between the sand particle average diameter, the slope, the liter amount and the initial motion velocity of sand particles, the influence of combined layer of litter and moss on the sand particles is more evident than that of only forest litter. Even if the slope is 35°, it is difficult for the sand particles (diameter more than 2. 0 mm) with the cover of forest litter to begin to move.