关键词: 风成沙波纹, Matlab, 图像处理, 沙波纹脊线, 沙波纹波长

Abstract: As the most basic geomorphic unit on sandy surface by wind, aeolian sand ripple is the theoretical foundation for studying the initial process and the movement process of aeolian sand transportation. Because of its small scales and fast formation, aeolian sand ripples is difficult to measure. In recent years, with rapid development of computer graphics technology, digital image processing technology is widely used and facilitates the measurement and calculation of aeolian sand ripples. Based on images taken by HD video camera, digital image processing technology is used to extract sand ripple crest lines and calculate sand ripple morphometric parameters utilizing Matlab software. In this study, through verification and analysis of sand ripple on the southeastern margin of the Tengger Desert, normal distribution rule of the sand ripple wavelength was obtained. Sand ripple wavelength grows and evolves over time and the range develops from 1 cm to 10 cm within 40 minutes. Finally, this method is applied to calculate sand ripple crest line length and sand ripple wavelength. This digital image processing method makes data statistics for sand ripples easier, and improves the efficiency of data collection, providing a new method for sand ripple crest lines extraction.

Key words: aeolian sand ripple, Matlab, image processing, sand ripple crest line, sand ripple wavelength