摘要
蒸发蒸腾是区域水资源循环中重要组成部分,对于区域水文学研究具有重要的意义。传统的蒸发蒸腾计算模型多以"点"上的观测为基础,对潜在蒸发量进行评价,难以在大面积区域上推广应用,在一定程度上限制了其在实际中的应用。遥感技术的发展,以及其能够方便快捷地获取地面信息的特性,为区域蒸发蒸腾量的遥感反演提供了可能。陆面能量平衡方法(SEBAL)模型是一种基于遥感影像的区域地表通量的估算模型,能够对区域蒸发蒸腾进行精确估算。本文在SEBAL模型的基础上,以河北平原为例,采取中分辨率成像光谱辐射仪(MO-DIS)影像产品,根据研究区下垫面的实际情况进行了参数估算,进行了区域实际蒸发蒸腾量计算及模型精确度评价,在此基础上,结合研究区的地面覆盖,对河北平原区域蒸发蒸腾分布进行了分析。
Evapotranspiration is one of the most significant components of the hydrologic budget. Conventional techniques that based on the point measurements are representative only of local scales and will be failled for large scales. Satellite sensors that observe the Earth from the space give a chance to estimate evapotranspiration in a large scale. The Surface Energy Balance Al- gorithm for Land （SEBAL） model was developed to estimate land surface fluxes using remotely sensed data and available mete- orological observations. In this paper, SEBAL has been utilized to estimate the surface fluxes over Hebei Plain in Northeastern China by using MODIS/TERRA images, in combination with meteorological data collected in meteorological stations distribu- ted over the study area. The estimated daily evapotranspiration by SEBAL are firstly compared with measurements by large weighing lysimeter in Luancheng Agro-Ecosystem Station （LAES） located in Hebei Plain. The comparisons show that the estimated evapotranspiration from SEBAL had a good agreement with the ground truth data. Based on the validation of the model, the spatial-temporal distributions of actual evapotranspiration were analyzed in combination with the up-to-date land cover map in Hebei Plain.
出处
《遥感信息》
CSCD
2008年第5期50-54,共5页
Remote Sensing Information
基金
中国地质科学院水文地质环境地质研究所青年科学基金(SK200606)资助
