关键词: 沙纹成因, 弹道理论, 跃移质特性轨迹, 冲击起动置换率, 沙地蚀积原理

Abstract: Bagnold's saltation impact start theory was reviewed by use of the theory on aeolian landform's erosion or deposition.While agreed to the correct aspects and its contribution,the author doubted the theory of sand-ripple trajectory formation cause.The property of equal-quantity,equal-height and equal-distance of saltation start is the concrete application and embodiment of the Bagnold's ideas.But the property contrail of sand particles can be only found in a few fluid particles and few has continuity.The contrail cannot substitute the three kinds of sand particles movement,and also be unable to show the correlativity of two kinds of sand particles start and the difference in sand movement.Author emphasized the diversity in sand particles start and movement.Experiment showed that wind start and impact start combined whether in the beginning or the sequent developmental phases.The regular arrange of sand lines is the reflection of the cycle pulsation of sand-bearing airflow,but not the replay of the characteristic contrail of the fluid start.

Key words: sand-ripple formation cause, theory of sand trajectory, characteristic contrail of sand particles, replacement rates of sand impact start, sandy land deposit or erosion theory