| 黄河上游末次冰盛期古洪水事件的初步研究 |
| |
| 引用本文： | 李长安,黄俊华,等.黄河上游末次冰盛期古洪水事件的初步研究[J].地球科学,2002,27(4):456-458. |
| |
| 作者姓名： | 李长安 黄俊华 |
| |
| 作者单位： | 中国地质大学地球科学学院，湖北武汉430074 |
| |
| 基金项目： | 国家自然科学基金项目 (No .49972 0 5 7)，中国地调局
区调项目 |
| |
| 摘 要： | 洪水的发生规律是洪灾预报的前提，已有的人类洪水记录时间尺度，不足以认识和把握洪水的出现规律。因此，利用地质记录延长洪水序列，探讨地球特征气候期的洪水特点，就显得非常重要的必要。黄河上游兰州－银川段的洪水地质记录表明，在末次冰盛期的20－18ka，该区共发生了106次大洪水漫滩事件，其中有18次为多次洪峰叠加的复合型大洪水，洪水的发生频率达53次/ka。发生于末次冰盛期的大洪水可能属冰凌洪水，与末次冰盛期强烈的气候波动和不稳定有关。这些大洪水的频发与中国西部的末次冰盛期出现的高湖面相对应，既不符合一般的季风气候理论，也不同于我国东部广大地区末次冰盛期以冷干为主的气候特点，表明中国西部气候的独特性和复杂性。
|
| 关 键 词： | 黄河 末次冰盛期 古洪水 古气候 |
| 文章编号： | 1000-2383(2002)04-0456-03 |
Preliminary Study of Paleoflood of Last Glacial Maximum in Upper Reaches of the Yellow River |
| |
| LI Chang an,HUANG Jun hua,ZHANG Yu fen,GUO Guang meng.Preliminary Study of Paleoflood of Last Glacial Maximum in Upper Reaches of the Yellow River[J].Earth Science-Journal of China University of Geosciences,2002,27(4):456-458. |
| |
| Authors: | LI Chang an HUANG Jun hua ZHANG Yu fen GUO Guang meng |
| |
| Abstract: | It is well known that paleoflood predictions must base on its occurrence. But our available records do not provide long enough temporal scale for identification and grasp the emergence law of flood events. So it is very important and necessary to discuss the characters of floods during the characteristic climatic period using geological records. The flood record of Lanzhou Yinchuan reach in upper Yellow River reveals 106 flood events, with a frequency of 53 per ka, during 20 to 18 ka including 18 complex floods superposed by multiple flood peaks. These paleoflood probably belonging to ice slush floods are associated with abrupt and extreme climatic oscillation and instability of this stage. The high frequency of these paleoflood is consistent with high lake surface of western China in course of last glacial maximum. It is neither in accordance with the monsoon theory nor different from the climatic feature of eastern areas typical of cold and dry climate. This indicates the climate complexity and particularity of western China. |
| |
| Keywords: | last glacial maximum paleoflood paleoclimate |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
