Journal of Geographical Sciences ›› 2022, Vol. 32 ›› Issue (2): 259-279.doi: 10.1007/s11442-022-1946-0
• Special Issue: Climate Change and Its Regional Response • Previous Articles Next Articles
ZHANG Yuan1(), YAO Xiaojun1,*(
), ZHOU Sugang1, ZHANG Dahong1,2
Received:
2021-04-02
Accepted:
2021-11-16
Online:
2022-02-25
Published:
2022-04-25
Contact:
YAO Xiaojun
E-mail:zhangyuangis2020@163.com;yaoxj_nwnu@163.com
About author:
Zhang Yuan (1997-), specialized in GIS design and development. E-mail: zhangyuangis2020@163.com
Supported by:
ZHANG Yuan, YAO Xiaojun, ZHOU Sugang, ZHANG Dahong. Glacier changes in the Sanjiangyuan Nature Reserve of China during 2000-2018[J].Journal of Geographical Sciences, 2022, 32(2): 259-279.
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Figure 3
Procedure of the glacier mapping: (a) R/SWIR ratio image, (b) image with a threshold of 1.95, (c) image after using the median filter, (d) glacier outline in vector format, (e) image after manual revision, and (f) individual glacier outline. Affiliated images (a)-(e) are magnified views of partial area. The background of Figures (d)-(f) is Landsat TM image (Bands 5, 4, 3) acquired on August 30, 2000.
Table 2
Statistics of glaciers in different basins in the Sanjiangyuan Nature Reserve of China
Name and code of basin | Name and code of sub-basin | Glacier number | Glacier area | Ice volume | Glacier average length | ||||
---|---|---|---|---|---|---|---|---|---|
(%) | (km2) | (%) | (km3) | (%) | (m) | ||||
The Yellow River Basin (5J) | Upper reach of the Yellow River (5K3) | 94 | 5.48 | 96.9±3.08 | 4.16±5.62 | 7.21±0.33 | 3.79±5.15 | 1382.13±15 | |
The Yangtze River Basin (5K) | Jinsha River (5K4) | 875 | 51.05 | 1026.63±24.63 | 44.03±44.91 | 76.22±1.98 | 40.37±30.89 | 1374.99±15 | |
Minjiang River (5K6) | 4 | 0.23 | 0.77±0.06 | 0.03±0.11 | 0.02±0.002 | 0.01±0.03 | 672±15 | ||
879 | 51.28 | 1027.4±24.69 | 44.06±45.42 | 76.24±1.98 | 40.38±30.89 | 1371.8±15 | |||
The Mekong River Basin (5L) | Angqu River (5L3) | 66 | 3.85 | 20.43±1.04 | 0.88±1.86 | 0.89±0.05 | 0.47±0.78 | 756.36±15 | |
Zhaqu River (5L4) | 198 | 11.55 | 73.24±3.58 | 3.14±6.51 | 3.32±0.15 | 1.76±2.34 | 841.92±15 | ||
264 | 15.40 | 93.67±4.62 | 4.02±8.37 | 4.21±0.20 | 2.23±3.12 | 820.53±15 | |||
The East Asia endorheic region (5Y) | Qaidam endorheic region (5Y5) | 225 | 13.13 | 404.26±7.38 | 17.34±13.46 | 38.11±0.30 | 20.18±4.68 | 1843.2±15 | |
The Tibetan Plateau endorheic region (5Z) | Ayako Kumku Lake and Hoh Xil Lake (5Z1) | 115 | 6.71 | 255.01±4.24 | 10.94±7.73 | 20.75±0.51 | 10.99±7.96 | 1994.43±15 | |
Siling Co (5Z2) | 137 | 7.99 | 454.34±5.43 | 19.49±9.9 | 42.35±0.69 | 22.43±10.76 | 2426.42±15 | ||
252 | 14.70 | 709.35±9.67 | 30.42±17.63 | 63.1±1.20 | 33.42±18.72 | 2229.29±15 |
Figure 8
Diagram illustrating the glacier disintegration: (a) background: Landsat TM image (Bands 5, 4, 3) acquired on August 30, 2000; (b) background: Landsat TM image (Bands 5, 4, 3) acquired on August 29, 2011; (c) background: Landsat TM image (Bands 5, 4, 3) acquired on August 01, 2010; (d) background: Landsat OLI image (Bands 6, 5, 2, 8) acquired on July 25, 2019.
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