摘要
柴达木盆地是中国四大内陆盆地之一。盆地内大面积由荒漠覆盖,气候干旱少雨,生态环境脆弱。基于MODIS遥感数据,应用表面能量平衡系统(SEBS),对柴达木盆地及8个水资源区2001~2011年的区域蒸散量进行了计算,并分析了其影响因素。结果表明:柴达木盆地11年间的年蒸散量呈现逐渐增长的趋势,由2001年的72.73mm增加到2011年的182.34mm。盆地8个水资源区的区域蒸散量按由大到小的顺序排列为:都兰河希赛区、柴达木河都兰区、格尔木区、巴音河德令哈区、哈尔腾河苏干湖区、鱼卡河大小柴旦区、那棱格勒河乌图美仁区、茫崖冷湖区;盆地气象站实测的蒸发量值与实际蒸散量值的换算系数为0.12。区域蒸散量与气温、降水及相对湿度等气象因子呈正相关关系;同时,区域蒸散量随着地表植被覆盖率的增加而增大。
Qaidam basin is one of the four inland basins in China. Covered with desert in most area,the climate of the basin is arid and the eco-environment is fragile. Based on MODIS data, the annual evapotranspiration( ET) of Qaidam basin and 8 hydrological subregions are estimated during the period of2001- 2011 using Surface Energy Balance System( SEBS) and the impact factors of ET are also analyzed in this paper. The result indicated that the annual ET increases between this 11 years and it increases from 72. 73mm of 2001 to 182. 34 mm of 2011. The annual ET decreases in order Xisai subregion of Dulan river,Dulan subregion of Qaidam river,Golmud subregion,Delingha subregion of Bayin river,Suganhu subregion of Haerteng river,Daxiaochaidan subregion of Yuqia river,Wutumeiren subregion of Nalinggele and MangyaLenghu subregion. The coefficient between actual ET and pan observed evaporation is 0. 12. The annual ET is positive correlation with air temperature,precipitation and relative humidity. The annual ET increases with the increase of vegetation coverage.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2013年第6期8-13,共6页
Hydrogeology & Engineering Geology
基金
国家自然科学基金项目(40772158)
关键词
蒸散量
表面能量平衡原理
MODIS
植被覆盖率
柴达木盆地
evapotranspiration(ET)
Surface Energy Balance System(SEBS)
MODIS
vegetation coverage
Qaidam basin
