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三峡大坝建成及动态蓄水运行后,滑坡成为库区地质灾害的主要形式之一.库区滑坡发育受大坝每年的蓄水泄洪周期及降水等因素影响.本文选择湖北秭归县卧沙溪滑坡作为研究对象,利用数码相机作为采集设备采集了2015年4月和5月的滑坡图像观测滑坡地表,用数字相关方法对滑坡图像进行处理得到滑坡位移场.位移量达到50 cm,但滑坡体表面各部分的位移量和方向不尽相同,滑坡运动是不均匀性的、非刚体运动.综合运用散斑法、灰度特征搜索等系列相关方法,成功处理了小形变关系、大位移量移动等滑坡特征问题,采用数码相机观测作为一种新的观测手段,还解决了采集图像的配准、灰度同级化等问题,并计算出滑坡体上各个点的方向和位移变化量,得到所有点的滑坡位移分布图,通过室内标定实验,误差在可接受范围内,验证了此方法的有效性.在满足滑坡监测要求的前提下,该方法操作简便、成本低、采集数据信息量大、可同时获取滑坡地表变形信息,有很好的推广前景.
After the completion of the Three Gorges Dam and its dynamic impoundment, the landslide has become one of the main forms of geological disasters in the reservoir area.The landslide development in the reservoir area is affected by the annual flood discharge cycle and precipitation and other factors.In this paper, Landslide was taken as the research object and landslide images of landslides were collected by using digital camera as the acquisition equipment in April and May of 2015. The landslide images were processed by digital correlation method to get the landslide displacement field with the displacement of 50 cm, The displacement and direction of each part of the surface are not the same, and the landslide motion is inhomogeneous and non-rigid body movement.Combined with the series of related methods such as speckle method and grayscale feature search, the small deformation relation, the large displacement movement Landslides and other landslide characteristics of the use of digital camera observation as a new observation means, but also to solve the acquisition of the image registration, grayscale and so on, and calculate the landslide body of each point of the direction and displacement changes, get The landslide displacement distribution map of all lands is verified by indoor calibration experiment and the error is within the acceptable range.When the landslide monitoring requirement Under the premise of the method is simple, low cost, large amount of information to collect data, which can obtain information about landslide surface deformation, have good promotion prospects.