[1]WANG Yajun,XU Liping,GUO Peng,et al.Analysis on Melting Snow and Ice Cover in Manas Mountain River Basin During the Period form 1977 to 2013[J].Research of Soil and Water Conservation,2015,22(06):208-212,218.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
22
Number of periods:
2015 06
Page number:
208-212,218
Column:
Public date:
2015-12-28
- Title:
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Analysis on Melting Snow and Ice Cover in Manas Mountain River Basin During the Period form 1977 to 2013
- Author(s):
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WANG Yajun, XU Liping, GUO Peng, LI Huiting
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College of Sciences, Shihezi University, Shihezi, Xinjiang 832003, China
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- Keywords:
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ice and snow cover; Manas River basin; melt; situation
- CLC:
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P331
- DOI:
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- Abstract:
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Based on the 1977 MSS, 1990, 2000 and 2013 TM images, the Maximum likelihood supervised classification method is used to distinguish between ice and other features, detection of ice and snow area and reserves change trend and to analyze its distribution pattern by combining with the gradient, aspect, slope. The results show that: (1) in time series, mountain snow and ice area reduced to 745.81 km2 from 3 125.63 km2 in Manas river basin during the period from 1977 to 2013, the total withdrawal covers area was 2 379.82 km2, accounting for 76.14% of the total area in 1977, with an average annual rate of 1.6% from 1977 to 1990, it was 2.9% from 1990 to 2000, and it was 2.0% in recent 13 years, the overall pattern showed a trend of “small-big-small” retreat; snow and ice reserves obviously decreased by 1 446.75 km3 in mountain of Manas River basin; (2) In spatial series: the fastest reduce gradient of snow and ice occurred at altitude of 2 700 m or less, with the rate of 25.55 km/a, followed by an elevation of 2 700~3 600 m, with the reduction rate of 23.44 km/a, the least cut rate occuured an elevation of 3 600~5 242 m, only with the rate of 17.11 km/a, with respect to slope aspect, the snow and ice distribution was bigger on shady slope than the sunny slope, it on is more north aspect, northeast aspect, northwest aspects than east aspect, and west aspect, and it is the least on the southern aspect, southeast, southwest aspects, but they did not change obviously between different aspects in percentage of ice and snow, with regard to slope gradients, snow and ice mainly distributed in gradients between 0°~50°, the proportion is more than 95%, and distribution is less under the gradient ≥50°; (3) temperature and annual precipitation are two main factors controling the changes of snow and ice, the summer temperature determines the melting of glaciers, and annual precipitation affects the accumulation of glaciers. The natural factors and human activities will course a further effect on the intensify of the melt.