The relationship between runoff and ground temperature in glacierized catchments in China |
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Authors: | Ren-sheng Chen Wen-wu Qing Shi-yin Liu Hai-dong Han Xiao-bo He Jian Wang Guang-yue Liu |
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Institution: | (1) Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Donggang West Road 320, Lanzhou, 730000, Gansu, People’s Republic of China; |
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Abstract: | A single parameter index method, in which ground temperature and air temperature is the sole input variable, respectively,
is used to evaluate and compare the glacial runoff in three typical glacier catchments, Dongkemadi glacier catchment in Tibetan
plateau, Koxkar glacier catchment and the headwater catchment of Urumqi River catchment in Tianshan Mountains in West China.
The method based on ground temperature is an attempt to evaluate glacier runoff in elevated terrains, as few studies have
focused specifically on the association between glacier runoff and ground temperature. The results identify ground temperature
versus a certain depth, which is a critical factor that affected glacier hydrological processes and showed that runoff data
is much better correlated with ground temperature than air temperature. Especially, at the latter two catchments, the largest
coefficients of exponential relationship R
2 between glacier runoff and ground temperature are 0.9 and 0.83, respectively. The accuracy of the method makes it possible
to estimate the glacier runoff with a certain depth ground temperature at a certain site, which may provide a new approach
to evaluate the glacier runoff for areas where there is a lack of observation data. |
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