Variation of evapotranspiration of Ningxia Yellow River economic zone and the validation using water budget method
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摘要: 在干旱的内陆地区，蒸散是地表水和地下水主要的排泄方式之一，准确估算地表蒸散量为干旱区水资源合理开发利用、生态环境保护提供理论依据。基于MODIS遥感数据，应用SEBS模型估算了宁夏沿黄经济区2001—2014年的区域蒸散量，分析了其影响因素，并应用水均衡原理对蒸散量计算结果的可靠性进行了验证。结果表明:沿黄经济区的年蒸散量在2001—2014年间总体上是逐渐增加的，从2001年的434.27 mm增加为2014年的517.82 mm；研究区主要的蒸散量为耕地蒸散量，农业占据了全区近2/3的耗水量；SEBS模型与水均衡原理计算的蒸散量结果吻合度较高，很好地验证了SEBS模型计算区域地表蒸散量的可靠性。Abstract: In the arid inland, evapotranspiration(ET) is the main way of discharge of groundwater and surface water. Accurate estimation of surface ET can provide the theory basis for reasonable exploitation and utilization of water resources and ecological environment protection in arid areas. Based on MODIS data, the regional ET of Ningxia Yellow River economic zone during the period of 2001—2014 was estimated using Surface Energy Balance System(SEBS) and the influencing factors of ET were analyzed in the meantime. Besides, the reliability of the ET results was validated using the principle of water budget. The results indicated that the annual actual ET of Ningxia Yellow River economic zone gradually increased from 2001 to 2014 with the value varying from 434.27 mm 2001 to 517.82 mm in 2014.The farmland ET is the major part of the total ET and agricultural water consumption accounted for nearly 2/3 of the regional water consumption. The result indicates that the SEBS ET is consistent with the value by water budget method, which is validated the reliability of SEBS model in regional ET estimation.
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Key words:
- evapotranspiration /
- SEBS /
- MODIS /
- water budget /
- Yellow River economic zone
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