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In recent years, many glaciers all over the world have been distinctly retreating and thinning. One of the consequences of this is the\udincrease of so called glacier lake outburst flood events (GLOFs). The mechanisms ruling such GLOF events are still not yet fully\udunderstood by glaciologists. Thus, there is a demand for data and measurements that can help to understand and model the\udphenomena. Thereby, a main issue is to obtain information about the location and formation of subglacial channels through which\udsome lakes, dammed by a glacier, start to drain. The paper will show how photogrammetric image sequence analysis can be used to\udcollect such data.\ud  \udFor the purpose of detecting a subglacial tunnel, a camera has been installed in a pilot study to observe the area of the Colonia\udGlacier (Northern Patagonian Ice Field) where it dams the Lake Cachet II. To verify the hypothesis, that the course of the subglacial\udtunnel is indicated by irregular surface motion patterns during its collapse, the camera acquired image sequences of the glacier\udsurface during several GLOF events. Applying tracking techniques to these image sequences, surface feature motion trajectories\udcould be obtained for a dense raster of glacier points. Since only a single camera has been used for image sequence acquisition,\uddepth information is required to scale the trajectories. Thus, for scaling and georeferencing of the measurements a GPS-supported\udphotogrammetric network has been measured.\ud  \udThe obtained motion fields of the Colonia Glacier deliver information about the glacier’s behaviour before during and after a GLOF\udevent. If the daily vertical glacier motion of the glacier is integrated over a period of several days and projected into a satellite\udimage, the location and shape of the drainage channel underneath the glacier becomes visible. The high temporal resolution of the\udmotion fields may also allows for an analysis of the tunnels dynamic in comparison to the changing water level of the lake

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

RECOGNITION OF DRAINAGE TUNNELS DURING GLACIER LAKE OUTBURST EVENTS FROM TERRESTRIAL IMAGE SEQUENCES