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目前对于黄土丘陵区沟蚀和沟道侵蚀的研究,还是比较薄弱的环节。现在已有的观测方法相当粗略,不能适应水土流失规律深入研究的需要。从1978年开始,我们探索地运用地面立体摄影测量法,监测沟蚀和重力侵蚀。这一方法,可以较准确地测出沟道各部位的变化过程,在目前这是研究沟道侵蚀比较理想的方法。使用这一方法的关键在于控制测量的精度.经过几年的努力,在山区平面控制和高程控制测量达到1/100地形图的图面精度。本文以天水龙王沟监测试验区的测量力法、结果进行分析研究,对今后建立沟道侵蚀模型提出了设想,使这一方法向着数字化、模型化、系统化方向发展。
At present, the study of gully erosion and channel erosion in the loess hilly region is still a weak link. The existing observation methods are quite rough and can not meet the needs of further study on the law of soil and water loss. Since 1978, we have explored the use of terrestrial photogrammetry to monitor gully erosion and gravity erosion. This method can be more accurately measured all parts of the channel change process, at present this is the study of channel erosion is the ideal method. The key to using this method is to control the accuracy of the measurement.After several years of hard work, the surface precision of 1/100 topographic map has been achieved in mountainous and elevation control surveys. In this paper, the measuring force method and result of Longwanggou monitoring and test area in Tianshui are analyzed and studied, and the tentative plan for establishing channel erosion model is proposed in the future, which makes this method develop in the direction of digitization, modeling and systematization.