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      氣候變化研究進(jìn)展 ?? 2011, Vol. 7 ?? Issue (6): 412-417.

      ? 氣候變化影響 ? 上一篇    下一篇

      氣候變化影響下林芝地區泥石流發(fā)育規律研究

      陳寧生1,周海波2,3,胡桂勝3,4   

      1. 1. 中國科學(xué)院水利部成都山地災害與環(huán)境研究所
        2. 中國科學(xué)院成都山地災害與環(huán)境研究所
        3.
        4. 中國科學(xué)院成都山地所
      • 收稿日期:2011-04-06 修回日期:2011-09-21 出版日期:2011-11-30 發(fā)布日期:2011-11-30
      • 通訊作者: 陳寧生 E-mail:chennsh@imde.ac.cn
      • 基金資助:
        國家科技部科技支撐計劃課題

      Development Rules of Debris Flow Under the Influence of Climate Change in Nyingchi

      • Received:2011-04-06 Revised:2011-09-21 Online:2011-11-30 Published:2011-11-30

      摘要: 從氣候變化出發(fā),介紹藏東南林芝地區泥石流類(lèi)型、分布及活動(dòng)特征,確定泥石流形成條件和臨界指標,揭示林芝地區泥石流發(fā)育規律。溫度和降水波動(dòng)性變化以及不同水熱組合影響林芝地區泥石流發(fā)育。冰川泥石流在溫度升高或降雨增大情況下都有可能被激發(fā)。日降雨量<5 mm時(shí),主要為溫度激發(fā)的冰雪消融型泥石流;日降雨量5~10 mm時(shí),主要為冰川降雨型泥石流;日降雨量>10 mm時(shí),為降雨型泥石流。冰川泥石流在升溫條件下發(fā)生次數占80%以上,降溫條件下約占20%;降雨型泥石流在升溫條件下發(fā)生次數占60%,降溫條件下占40%。從激發(fā)泥石流的規模、次數和災害大小看,高溫多雨年代和低溫多雨年代都有利于泥石流發(fā)生。

      關(guān)鍵詞: 泥石流, 氣候變化, 林芝地區, debris flow, climate change, Nyingchi region

      Abstract: Based on the typical debris flows in Nyingchi, this paper presents the basic type, distribution and movement of debris flows, analyzes the initiation condition and critical threshold, and discloses the incubation law of debris flows, and also the impact of temperature and rainfall changes on debris flow initiation. Glaciers debris flow may be inspired during temperature or rainfall increasing. If daily precipitation < 5 mm, melting ice and snow debris is stimulated mainly by temperature; when daily precipitation is 5-10 mm, mainly the glaciers-rainfall debris flow occurs; when daily precipitation >10 mm, rainfall debris flow is in dominate. Glacier debris flows under temperature increasing and decreasing account for 80% and 20%, respectively, while the rainfall debris flows account for 60% and 40%, repectively. Much rainfall are benefit for the initiation of debris flows.

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