摘要
本文主要讨论了遥感技术在水文学领域的应用。利用基于能量平衡原理的SEBS模型,结合NOAA/ AVHRR数据,通过遥感方法估算了华北平原的区域陆面蒸散量,并分析了不同潜水埋深条件下植被指数对蒸散发的影响。通过遥感估算方法得到,华北平原6～8月份是蒸散量较高时期,变化幅度较大,1、2月和11、12月是蒸散量较低时期,变化幅度较小。其日蒸散量变化范围在0～8 mm之间;年蒸散量在520～1100 mm之间,平均为700～800 mm。地下水埋深较浅的沿海、黄河沿岸以及河南黄河以北的农业区为蒸散发的高值区。在不同潜水埋深条件下,蒸散量与植被指数之间均存在线性正相关性。且在潜水埋深介于1～2m的情况下,陆面蒸散与植被指数间的关系最明显,两者之间的相关性达到0.669。
The paper mainly discussed about application of remote sening technology in the hydrological field. It estimated volume of regional land evapotranspiration in North China Plain with NOAA/AVHRR data and the SEBS model which is basing on energy balance theory, and then analyzed relationship between NDVI and evapotranspiration volume under conditions of different depths of groundwater table. The calculation results showed that daily evapotranspiration volume of North China Plain was relatively high during every June to August, with a larger variation range, and the volume was relatively low in January, February, November and December, with a smaller variation range. The daily evapotranspiration in North China Plain varied from zero to eight millimeters and the annual evapotranspiration volume ranged between 520 to 11oo millimeters. Evapotranspiration was stronger in the coastal areas and regions along the Yellow River where groundwater table was shallower as well as in the agricultural regions of Henan Province, north to the Yellow River. There were positive correlations between evapotranspiration volume and NDVI under conditions of different depths of groundwater table, and the correlation between them was most obvious when the depth of groundwater table was between 1 to 2 meters, with the correlation coefficient up to 0.669.
出处
《城市地质》
2009年第1期43-48,42,共7页
Urban Geology
关键词
蒸散发
遥感
华北平原
NOAA
Evapotranspiration
Remote Sensing
North China Plain
NOAA
