【摘要】 文中主要应用遥感方法计算了黄河三角洲地表蒸发量及其地表特征参数。地表特征参数及其合理组合揭示出黄河三角洲下垫面的基本特征:农田植被指数和天然植被的植被指数有不同的变化规律,下垫面覆盖度低,裸地较多,地表较湿润,蒸发量较大。蒸发量时空分布主要受下垫面条件控制,滨海裸地和受人类活动影响较大的农田等地蒸发量较大,年际平均蒸发量在570~860 mm之间。更多还原

【Abstract】 In this paper we estimate the evaporation rate in the Yellow River Delta (YRD) and analyze its relationship with surface parameters using remote sensing data. The surface parameters and their intergration can provide more information about the ground condition. The basic characteristics of the YRD ground are that the regular pattern of the change of natural vegetation NDVI (Normalized Difference Vegetation Index) is distinguished from that of the farm NDVI; that the cover-degree is low; that the area of bare soil is large; that the surface is wetter; and that the amount of evaporation is large. The average annual evaporation varied between 570 mm and 860 mm, and the surface characteristics mainly controlled the temporal and spatial distribution of evaporation in the YRD.更多还原