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C2: ID.10612 Glaciers & Hydrological Dynamics
Glacier rmovement and change in the Parlong Zangbu Basin
1Nanjing University, China; 2Ludwig-Maximilian-University Munich, Germany;
Glacier movement and change in the Parlong Zangbu Basin
Chang-Qing Ke1, Lan-Yu Li1, Zhu-De Shao1, Ralf Ludwig2
Abstract: We apply the SAR interferometry and feature-tracking methods to X-band synthetic aperture radar (SAR) image (COSMO_Skymed data) to derive detailed motion patterns of glaciers in the Parlung Zangbo basin during summer and winter 2010. The results indicate that the flow patterns are generally constrained by the valley geometry and terrain complexity. Almost four glaciers exhibited high velocities in their upper sections, where the slope is much bigger, on the contrary, low velocities in their lower section with smaller slope and glacier tongue. The mean velocities of the four glaciers in summer was 0.63m/d, and the maximum of 0.75m/d was founded on glacier NO. 1. The mean velocities in winter was 0.32m/d, and the maximum of 0.54m/d for glacier NO. 1 too. The velocity scope of four glaciers was 170-205 ma-1. The velocity shows a positive correlation with the glacier area and length. Variation of incidence angle of radar wave and topographic slope error have a significant effect on glacier velocity calculation.
Debris on a glacier (referred to as supraglacial debris) and debris occurring outside the glacier boundaries (referred to as periglacial debris) are both derived from a common source (i.e., valley rock or sand bank material), both the source and glacier tend to produce similar spectral responses in the reflection region that render them mutually indistinguishable. Thermal imaging of glaciers has proven useful in the detection of debris-covered areas of glaciers. Glacial ice under supraglacial debris acts as a cooling source and thus reduces its land surface temperature (LST), whereas no such cooling source exists beneath periglacial debris. Therefore, the difference between the LST values of supraglacial and periglacial debris could be useful for distinguishing between these surfaces. With the support of ancillary digital elevation model (DEM), Multi-bands images of Landsat5 TM (including the thermal band) in 1988, 2000 and 2010 were used to extract glacier changes in the Parlong Zangbu. The results indicated that glacier areas gradually dereased from 930.84 km2 in 1988, to 918.46 km2 in 2000, and to 907.16 km2 in 2010. The decreasing rate was 1.03km2/a between 1988 and 2000, and 1.13 km2/a between 2000 and 2010. Meanwile, debris-covered glacier area increased slightly from 63.39 km2 in 1988, to 69.64 km2 in 2000, and to 69.67 km2 in 2010. Glacier volume decreased 3.42% from 1988 to 2010, amounting to 126.8×108m3 water, which resulted in the weakening of regulation to river runoff. Length of Glaciers shortened, and altitude of glacier ends rose. The area of glacial moraine lakes was 1.43×106m2 in 1988, and 5.5×105m2 in 2000, 3.39×106m2 in 2010. The spread of glacial moraine lakes indicated the glacier melting and retreat. In the regime of global warming, generally speaking, glaciers in the Parlong Zangbu Baisn are retreating, moreover, glacier melting accelerated with the annual mean temperature rising.
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Conference: 2016 Dragon 3 Final Results Symposium
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