Retrieval and analysis of coal fire temperature in Wuda coalfield,Inner Mongolia,China |
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| Authors: | Weiguo Jiang Xiaohua Zhu Jianjun Wu Lei Gu Guobin Ma Xiaochen Liu |
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| Institution: | (1) CAS Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, People’s Republic of China;(2) State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi’an, 710075, Shaanxi, People’s Republic of China |
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| Abstract: | Coal fire burning around the world is an environmental catastrophe characterized by the emission of noxious gases, particulate
matter, and condensation by-products. In this study, coal fire temperature is retrieved based on Landsat 5 TM images and Generalized
Single-Channel Algorithm (GSCA), in Wuda coalfield, Inner Mongolia, China. Then coal fire zones are extracted by Jenks’ natural
breaks and threshold methods based on temperature images. Changes of coal fire zones are analyzed from 1989 to 2008. The results
are summarized as follows: 1) The coal fire temperature retrieval method based on Landsat 5 TM and the GSCA model is effective
and feasible, because the temperature error is relatively small (from −2.9°C to +2.6°C) between the measured temperature and
the retrieved temperature. 2) The accuracy is relatively high to extract coal fire zones through the Jenks’ natural breaks
and threshold methods, because 83.56% of surveyed area is located in the coal fire zones extracted in 2005. 3) The coal fire
area increased 9.81 × 105 m2 from 1989 to 2005, and the annual growth is about 6.1 × 104 m2, with an annual increasing rate of 2.48%. The area of coal fire decreased by 8.1 × 105 m2 from 2005 to 2008. |
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