摘要
本文以陇中黄土高原的祖厉河流域为研究区,基于Landsat系列遥感影像,利用主成分变换方法,与地面温度和植被指数相结合,进行土地利用/土地覆盖提取研究,在此基础上,探讨祖厉河流域土地利用/土地覆盖变化(LUCC)及其驱动因素。利用基于TM影像的SEBAL(Surface Energy Balance Algorithm for Land)模型,从祖厉河流域三期影像提取了区域蒸散发通量。首先进行了NDVI、比辐射率和地面温度等地表参数的计算,然后反演了地表的净辐射、土壤热通量和感热通量,根据能量守恒最终获得日蒸散发量。结合气象观测数据反演作物系数,最后计算月蒸散发量。对同期的土地利用/土地覆盖数据和陆面蒸散发量进行对比分析,探讨了土地利用类型的变化对流域内能量和水分时空分异的影响。
Landsat series images of Zuli River basin, in the west of China, are used to derive not only Land Use and Land Cover （LULC）, but also the regional evapotranspiration （ET）. Five bands new combination is set up to enhance the difference of LULC. Contrasting the different time＇ s LULC maps we can get the region＇ s Land Use and Land Cover Change （LUCC） and analysis about driving forces of LUCC is concentrated to natural and human factors. SEBAL model is selected to evaluate ET from TM images. Daily ET is calculated using energy balance equation. Using FAO Penman-Monteith equation, daily reference ET is derived and crop coefficient is confirmed. Monthly ET is finally estimated by the crop coefficient and reference ET. The comparison between LULC and ET shows that LUCC modulates the distribution of energy and water at basin scale.
出处
《测绘科学》
CSCD
北大核心
2009年第6期65-67,10,共4页
Science of Surveying and Mapping
基金
兰州交通大学"青蓝"人才工程基金资助计划资助
