Science Service System
You are here : Home : Proposals_Summary

Summary of Proposal LAN0814

TitleRemote Sensing Based Debris-Cover & Motility Analysis of Chhota-Shigri Glacier, Himalaya
Investigator Tiwari, Reet Kamal - Indian Institute Of Technology, Earth Sciences
Team Member
Dr. Gupta, Ravi P. - Indian Institute Of Technology, Earth Sciences
Mr. Tiwari, Reet Kamal - Indian Institute Of Technology, Earth Sciences
SummaryPrecise mapping, monitoring and inventorying of world glaciers is important for assessing the impacts of a changing climate on the global extent of glaciers. However, detailed glacier inventory data are still lacking for most parts of the world (IPCC 2007). The presence of debris cover over the glacier boundaries further complicates the mapping of glaciers throughout the world. Debris cover on glacier boundaries seriously impedes the global inventorying of glaciers and confounds most of the techniques developed for semi-automated mapping of the glaciers. The debris on the glacier (supraglacial debris) and the debris occurring outside the glacier boundary (periglacial debris) being derived from a common source i.e. the valley rock, tend to have a similar spectral response in the solar reflection region which renders them mutually in distinguishable. Though numerous techniques for mapping of clean glaciers using remote sensing data have been devised, mapping of partially debris-covered glaciers still remains a bottleneck for the inventorying of glaciers from remote sensing data. An important objective of the proposed study is to explore the potential of integrated SAR - thermal - optical remote sensing data for discriminating supraglacial debris from periglacial debris. This should enable the mapping of debris covered glacier boundaries and the technique could be implemented in other glacier terrains as well. Further attempt will also be made to investigate whether estimation of thickness of debris over glaciers is possible from integrated thermal-optical-SAR data. This should be of great interest in general. Mention may be made that separate arrangement for procuring repetitive ASTER data have already been made. Further, detailed field investigations are also proposed on this glacier site. Another aspect of the research will have the focus on the glacial surface motion detection. The SAR Interferometry has been proved for the detection of the surface changes. Oodles of the works have shown that the DInSAR can be used for the detection of the glacial surface motion in cm range in images. It is seen that over the glaciers a major problem is the loss of coherence due to snowfall, melting or snow drift between the two image acquisition dates. To derogate the influences of the snowfall, melting, etc., the time-difference of the data acquired may be small; however, with small time difference the problem is the reliability and representative-ness of the measurements. For this reason, in the proposed study, data form different time periods/intervals of the year is requested. The extrapolated results of the annual velocities derived form the average of different time period of the year can possibly give more precise results.

Back to list of proposals

DLR 2004-2016