| 摘要: |
| 【目的】用遥感技术估算陕西关中渭北地区的实际蒸散，并将估算的蒸散与参考作物蒸散进行比较。【方法】以陕西关中渭北地区2008-06-23和09-05的NOAA-18卫星遥感资料以及该地区的气象资料为供试数据，利用能量平衡单层模型，计算陕西关中渭北地区的潜热通量及蒸散，并将蒸散估计值与参考作物蒸散分布进行比较。【结果】能量平衡单层模型中参数的反演途径直接影响着蒸散的反演精度，蒸散与植被指数的分布具有高度的一致性，蒸散的变化与研究区域的土地利用密切相关。【结论】根据下垫面特征建立的、物理意义清楚的基于遥感和气象资料的能量平衡单层模型，更适合区域实际蒸散的估算。 |
| 关键词: 蒸散 能量平衡单层模型 陕西关中渭北地区 能量平衡 |
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| 基金项目:国家高技术研究发展计划项目（2009AA12Z1463） |
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| Application of remote sensing model based on energy balance to estimate evapotranspiration |
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| Abstract: |
| 【Objective】Evapotranspiration was estimated in Weibei area of Guanzhong,Shaanxi province by remote sensing technique,and the estimated evapotranspiration was compared with reference crop evapotranspiration.【Method】Using NOAA/AVHRR remote sensing data at 2008-06-23 and 2008-09-05 and meteorological observation data in Weibei area as inputs,residual term of energy balance equation was used to calculate latent heat flux and evapotranspiration in Weibei area.In addition,the distribution of estimated evapotranspiration was compared with reference crop evapotranspiration.【Result】Retrieval method of parameters of residual term of energy balance equation directly influenced the accuracy of evapotranspiration.The vegetation index highly accorded to spatial distribution of evapotranspiration.Evapotranspiration changed with land use in the study area.【Conclusion】The key issue of model application is to build retrieval evapotranspiration model with clearly physical principle by remote sensing data and meteorological observation data,according to ground surface characteristics. |
| Key words: evapotranspiration remote sensing Guanzhong Weibei of Shaanxi energy balance |
