基于BTOPMC模型的NDVI分辨率影响研究

Effect of temporal resolution of NDVI based on BTOPMC model

归一化植被指数NDVI是S-W模型计算蒸散发的主要输入资料之一。分别采用月分辨率和10d分辨率的NDVI估算黄泥庄流域1985~1987年蒸散发能力并驱动一个水文模型,以研究NDVI分辨率对蒸散发能力估算和水文模型精度的影响。结果表明:由10d分辨率NDVI计算的根系层蒸发能力和植被截留蒸发能力都比由月分辨率资料计算的值小,年根系层蒸发能力减少9.77%~13.64%,植被截留蒸发能力减少5.34%~8.43%,并且,NDVI分辨率在夏季对根系层蒸发能力影响较大,而在冬季对截留蒸发能力影响较大。利用估算的两种蒸散发能力值分别驱动BTOPMC模型并分别率定参数,模型两种模拟结果较接近,水文模型对NDVI分辨率并不敏感。

Normalized difference vegetation index(NDVI) data,obtained from remote sensing information,are essential in the Shuttleworth-Wallace(S-W) model for estimation of evapotranspiration.In order to study the effect of temporal resolution of NDVI on potential evapotranspiration estimation and hydrological model performance,monthly and 10-day NDVI data set were used to estimate potential evapotranspiration from Jan 1985 to Dec 1987 in the Huang Nizhuang catchment.The differences of the two calculate results are an...