Abstract
Glaciers on the Tibetan Plateau are undergoing an accelerating retreat under climatic warming, with the immediate result of glacial lake outburst floods (GLOFs) becoming increasingly frequent. Glacial lakes in the southeast of the Tibetan Plateau are densely distributed. Due to the difficulties associated with field investigations of glacial lakes, including remote locations and harsh weather conditions, methods which combine remote sensing, geographic information systems and hydrodynamic modeling (HEC-RAS) with field investigation were developed to assess regional glacial lake variation and hazard. The methods can be divided into three levels. At the first level, multi-temporal satellite images were used to (1) study the variation of glacial lakes for the whole region during recent decades, as well as (2) qualitatively identify potentially dangerous glacial lakes (PDGLs). The second level is an in-depth evaluation of the degree of danger for selected PDGLs by ground-based surveys, and then verification of the first-level results. At the third level, the one-dimensional (1D) hydrodynamic model HEC-RAS was used to simulate the inundation characteristics of hypothetical outburst of PDGLs. The three levels downscale from the whole study area to individual PDGLs, and thus assess the hazard of glacial lakes progressively. The methods were then applied to a region of southeastern Tibet—the Boshula mountain range—to analyze the variation of glacial lakes and assess potential hazards posed by GLOFs. Since these methods employ easily accessible data and instruments, the application in other regions is promising.
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Acknowledgments
The authors would like to thank the two anonymous reviewers’ constructive comments. This work was jointly supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-T11), the External Cooperation Program of the Chinese Academy of Sciences (GJHZ0960), and the National Natural Science Foundation of China (40810019001). Prof. Chaolu Yi supplied two THALES MobileMapper for field GPS points’ collection. We are indebted to the local Tibetan residents’ participation in the fieldwork.
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Wang, W., Yao, T., Yang, W. et al. Methods for assessing regional glacial lake variation and hazard in the southeastern Tibetan Plateau: a case study from the Boshula mountain range, China. Environ Earth Sci 67, 1441–1450 (2012). https://doi.org/10.1007/s12665-012-1589-z
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DOI: https://doi.org/10.1007/s12665-012-1589-z