| 长江江源地区冰川冰、雪、水的化学特征 |
| 摘要点击 876 全文点击 1365 投稿时间：1987-05-28 |
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| 中文摘要 |
| 长江是我国第一大河,也是世界著名的第三大河。她发源于青藏高原唐古拉山主峰各拉丹冬雪山西南侧的姜古迪如南支冰川。江源地区包括通天河和楚玛尔河汇合口以上的广大区域,区内自北而南有楚玛尔河、沱沱河和当曲等主要支流,构成扇状水系。本区地处青藏高原腹部,地势高而寒冷,高山区现代冰川和多年冻土广泛发育,自然环境独具特色。 |
| 英文摘要 |
| Detailed research on the hydrochemical characteristics of the glacier ice, snow, glacier melt water and river water at the headwaters of the Yangtze River was done in this paper.The results shows that the mineralization degree of (now and ice in the headwaters is 3.94％—22.44 mg/L, which is one of the low mineralization region in China. Its pH is 6.48—6.98. The pH of glacier melt water and river water is 7.26—7.92 with mineralization degree usually under 200 mg/L, only in the middle-lower reaches of the main stream of the Tuotuo River, there appears high mineralization water. The ions in various waters are mainly composed of the anion HCO3- and cation Ca2+. In snow and ice, Ca2+≥Na++Mg2+, in glacier melt water and river water Ca2+≤Na++Mg2+, the content of Cl- in both types of water is nearly the same. The contents of those principal ions increase along with increase on mineralization degree. The. hydrochemi-cal type is CICa and CIMg These characteristics mean that the precipitation of this region is influenced by the warm and wet air currents from the Indian Ocean, the main Supply of rivers is melt water of snow and ice, but the influence of the natural environment over the hydro-chemical composition cann't be neglected. |
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