Textural research on the main source of the Changjiang River |
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| Authors: | Guangyou Sun Wei Deng Qingchun Shao Runkui Hua |
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| Institution: | (1) Changchun Institute of Geography, Academia Sinica, 130021 Changchun, PRC |
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| Abstract: | The Chinese people began to research the main source of the Changjiang (Yangtze) River 2,400 years ago. Limited by the scientific
level, they did not discover it.
The Tuotuo River was determined as the main source of the Changjiang River in the 1970s. However, this was not correct, because
when comparing the length of the Tuotuo River with the Dam River, the glacier length at the headwaters was added to the Tuotuo
River, resulting in that the Tuotuo River is 1 km longer than the Dam River, keeping in mind that the glacier can not be regarded
as part of the river.
In the summer of 1986, we investigated the source of the Changjiang River, we accurately measured the length of both the Tuotuo
and Dam rivers, we discovered that the Dam River was 353.1 km long, and the Tuotuo River was 346.3 km long, the Dam River
thus being 6.8 km longer than the Tuotuo River. The discharge of the Dam River is 196.18 m3/sec., 2.6 times as large as that of the Tuotuo River, that of the Tuotuo River is 75.10 m3/ sec. The drainage area of the Dam River is 1.8 times as larger as that of the Tuotuo River; the drainage area of the Dam
River is 30,715.7 km2, the Tuotuo River is 16,691.0 km2.
Through synthetic analysis of the factors mentioned above, we came to the conclusion that the main source of the Changjiang
River is the Dam River instead of the Tuotuo River. |
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| Keywords: | the Changjiang River main source of a river headwater |
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