| 摘要: |
| 通过对江河源区区域内水环境所包含的大气降水、冰川冻土、地表径流、沼泽湖泊等4个方面的分析，揭示了江河源区水环境变化的规律及其影响因素。结果表明：①降水逐年变化呈现波动，增减不明显，Cν值为0.15～0.55；季节变化呈现“双峰型”曲线，峰值分别出现在7月和9月；②地表径流受降水、冰雪融水及地形等因素的影响，呈“单峰型”曲线；③冰川冻土明显减少，作为径流稳定补给的冰雪融水已出现年际澡的丰枯变化；冻土层温度上升0.5～1 ℃，厚度减小了10～20 m；④沼泽湖泊数量急剧减少，面积变小甚至干涸。 |
| 关键词: 江河源区 水环境 影响因素 |
| DOI： |
| 分类号: |
| 基金项目:青海省重大科技攻关项目(2002-N-106) |
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| Study on changes of water environment in source regions of Yangtse River,Yellow River,Lantsang River and its factors |
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| Abstract: |
| Through analyzing four aspects about water environment including rainfall,river current,glacier and frozen earth,swamp and lake etc in the region,this paper discovered its change laws and influencing factors.The result showed that:① precipitation fluctuated in different years,no obvious change,Cν arranged from 0.15-0.55;seasonal precipitation change assumed "double peak value"trend,peak value appeared in July and September respectively;② river current influenced with rainfall,water from the melting of glacier and frozen earth,and terrain etc,it has shown "onefold peak value" trend;③ glacier and frozen earth lessened obviously,water from glacier and frozen earth melting which is regarded as steady replenishment to river current,has changed much or less between years;the temperature of frozen earth storey had rised 0.5-1 ℃,its thickness thined 10-20 m;④ the number of swamp and lake has reduced sharply,its acreage diminished,even dried up. |
| Key words: source regions of Yangtse River Yellow River Lantsang River water environment factors of the change |
