Journal of Geographical Sciences ›› 2019, Vol. 29 ›› Issue (2): 306-320.doi: 10.1007/s11442-019-1598-x
• Research Articles • Previous Articles
Chao GAO1,2(), Suiji WANG1,2(
)
Received:
2017-12-15
Accepted:
2018-03-09
Online:
2019-02-25
Published:
2019-02-25
About author:
Author: Gao Chao, Master Candidate, specialized in fluvial geomorphology. E-mail:
Supported by:
Chao GAO, Suiji WANG. Evolution of the gravel-bedded anastomosing river within the Qihama reach of the First Great Bend of the Yellow River[J].Journal of Geographical Sciences, 2019, 29(2): 306-320.
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Table 1
Geometric parameters of channel planforms in different years"
Date of image captured | Talweg length (km) | Sinuosity | Area of the anastomosing belt (km2) | Land area (km2) | Water area (km2) | Number of wetlands |
---|---|---|---|---|---|---|
July 8th, 1990 | 11.43 | 1.21 | 16.89 | 8.12 | 8.77 | 37 |
August 15th, 2001 | 12.83 | 1.36 | 17.00 | 8.27 | 8.73 | 40 |
July 23rd, 2013 | 12.72 | 1.35 | 17.17 | 9.12 | 8.05 | 60 |
July 15th, 2016 | 12.18 | 1.29 | 17.30 | 9.11 | 8.19 | 60 |
Table 2
The locations of field work sites and the characteristics of columnar sections on the channel banks of the Qihama reach of the anastomosing river in 2016"
Site | Observation date | Latitude | Longitude | Channel and sediment characteristics |
---|---|---|---|---|
QP25 | April 26th | 33°22′51″N | 102°01′20″E | The upper layer of the left main channel bank at this site is composed mainly of fine sand and silt, while the lower layer below 75 cm is gravel. |
QP26 | April 30th | 33°22′33″N | 102°00′36″E | The width of the right anastomosing channel is 60 m, the water width is 30 m, and the water depth is 1 m at this location. The bank height is 2 m, with 1 m mud layer on the top and 1m gravel layer on the bottom. The mean size of gravel is between 6 cm and 7 cm, ranging up to a maximum of 10 cm. |
QP27 | April 30th | 33°22′43″N | 102°00′40″E | The main channel width at this site is about 200 m and comprises two gravel bars in the center and one gravel bar adjacent to the right bank which had been eroded about 1 m. |
QP28 | April 30th | 33°22′46″N | 102°00′36″E | The width of the anastomosing channel adjacent to the main channel at this site is 15 m and an upward extending gravel bar with a maximum width of 30 m is next to the left bank of the main channel. The right bank at this site is about 1.6 m high and has a 1 m mud layer on the top and a 0.6 m gravel layer on its base. A large number of trees on the right bank were fallen, indicating that this right bank was washed back. |
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