【摘要】 黑河流域有大量近2000年来旱涝史料记载资料,通过提取和处理旱涝记载信息,建立近2000年来的旱涝等级序列。利用统计分析得到黑河流域近2000年来旱涝阶段。近40年旱涝灾害与降水量具有较高的负相关性,相关系数为-0.892,建立旱涝等级与降水量距平百分率关系,依据黑河流域近2000年的旱涝序列重建2000年来降水量序列。得到结论:从1～5世纪降水量不断增加,5～15世纪降水量不断减少,15～20世纪降水量不断增加。更多还原

【Abstract】 Based on the abundant historical data about droughts and floods and temperature changes in the past 2000 years in Heihe River basin,through distilling and disposing the data,the drought and flood grades sequences in the past 2000 years in Heihe River basin were built. Using methods of the statistical analysis and power spectrum analysis the periods and phases of droughts and floods were educed. Drought and flood disasters and precipitation had good minus correlation in recent 40 years,correlation coefficient was - 0. 892. The relation of drought and flood grades and percentage of anomalies of annual precipitation was built. Using drought and flood sequences the precipitation sequence in the past 2000 years was rebuilt.更多还原