艾比湖面积动态变化与气象要素的关系研究

Research on the relationship between the dynamic change of water area of Ebinur lake and meteological factors

利用2005—2010年250 m×250 m的EOS-MODIS卫星资料,通过预处理、几何校正,在C++环境下,进行水体判识与面积计算,对艾比湖湖区水域面积进行计算,得到逐旬的遥感动态监测数据,将其与同期气象台站的观测资料(温度、降水、风速、蒸发量)相结合,在SPSS中进行统计分析.结果表明:①艾比湖面积有显著的季节性变化,同一年内,由春到秋,艾比湖湖区水体面积总体呈现逐渐减少的趋势;湖区水域面积年内最大值多出现在春季,年内最小值多出现在秋季,但秋末湖区水域面积相对秋初又有所增加.②从年际变化来看,2005—2010年,艾比湖湖区水域面积呈现逐年减少的趋势;旬平均最高峰出现在4月中旬,且5月下旬湖区面积会出现次高峰,旬平均最小值出现在10月上旬,旬平均最高峰主要是山区融雪和降水的共同作用所致,次高峰主要是由降水所致.③相关分析表明,湖泊面积变化与温度、降水相关性不显著,但与风速有显著的正相关,与蒸发量有显著的负相关.

We choose a consecutive of 5 years MODIS data by using 250 meter resolution image since 2005 to 2010,based on the Eos/Modis data incept and dispose system,by using per-processing,geometry emendation,after that,we judge and calculate the water area of Ebinur lake by using C＋＋ program,and we got the dynamic variety of Ebinur lake by every ten days,combined them with meteorological data,analysis with SPSS.The results show that： 1.The area of Ebinur lake was decreased from spring to autumn seasonally;The maximal lake area appeared in spring and the minimal lake area appeared in autumn,but the lake area of the last ten-day was always bigger than the first ten-day of the October.2.The area of Ebinur lake was also decreased year by year from 2005 to 2010,the lake area shrink distinctly;There were two peak value of the Ebinur lake area in spring,first one occurred in the middle ten-day of April,which was bigger than the second peak value that occurred in the last ten-day of May,and the first peak value was caused by the melted snow and the rainfall,and the second peak value was caused only by the rainfall.3.The correlation analysis shows that there has no significant correlation between the lake area and rainfall and temperature,but there has significant positive correlation between the lake area and the wind speed,and significant negative correlation between the lake area and the evaporation.