| 基于表面能量平衡模型的张承地区蒸散发研究 |
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| 引用本文： | 董祥旺,金晓媚,张绪财,殷秀兰,金爱芳,郎捷,罗绪富,马靖宣.基于表面能量平衡模型的张承地区蒸散发研究[J].水文地质工程地质,2023,50(1):13-20. |
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| 作者姓名： | 董祥旺 金晓媚 张绪财 殷秀兰 金爱芳 郎捷 罗绪富 马靖宣 |
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| 作者单位： | 1.中国地质大学（北京）水资源与环境学院，北京 100083 |
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| 基金项目： | 国家自然科学基金项目（41372250）；行政事业类专项项目（121201014000150003） |
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| 摘 要： | 张家口承德地区是京津冀城市群生态安全的重要屏障，针对该地区长时间序列实际蒸散的时空变化研究较少，以张家口承德地区为研究区，基于表面能量平衡模型（SEBS）结合MODIS和GLDAS数据反演了研究区2001年1月—2020年12月逐月的蒸散量，将反演结果与MOD16A2数据在趋势上进行了对比，并用2021年7月的野外实测数据在像元尺度上对其进行验证，利用Sen+MannKendall显著性检验方法对其时空趋势变化进行了分析，用相关性分析研究了其影响因素。结果表明：模型蒸散量反演结果与MOD16A2数据在月尺度上相关性良好，与野外实测数据的相对误差小于15%，具有较高的可靠性；研究区的年蒸散量在20 a间呈现波动上升趋势，最大值为2013年的545 mm，最小值为2002年的348 mm，且承德地区的蒸散量明显高于张家口地区；20 a间研究区75.41%的区域蒸散量基本稳定不变，5.13%的区域蒸散量增加，1.11%的区域蒸散量显著降低，18.35%的区域蒸散量轻微降低；气温、植被对蒸散量的影响具有显著的正相关性，不同土地用地类型下蒸散量由高到低的顺序为：林地>水体>草地>...
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| 关 键 词： | SEBS模型 蒸散发 Sen+MannKendall显著性检验 张家口承德地区 相关性分析 |
| 收稿时间： | 2022-04-05 |
Research on regional evapotranspiration in the Zhangcheng area based on the SEBS model |
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| Institution: | 1.School of Water Resources and Environment, China University of Geosciences （Beijing）, Beijing 100083, China2.China Institute of Geo-Environment Monitoring, Beijing 100081, China |
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| Abstract: | Evapotranspiration (ET) is the main process of water and energy conversion in the hydrosphere, atmosphere and biosphere. Accurately estimation of ET is of great significance in ecological environment protection. The city of Chengde and Zhangjiakou, taken as the study area, is an important barrier for the ecological security of the Beijing-Tianjin-Hebei urban areas. There have been fewer studies of actual evapotranspiration for long-term sequences in the region. In this paper, the monthly actual ET in the study area from January, 2001 to December, 2020 is simulated based on the SEBS model using MODIS and GLDAS data. The SEBS results are compared with the MOD16A2 data in trend, and the field measurements on July 2021 are also used for validation at the pixel scale. The method of Sen+MannKendall test is used to analyze the temporal and spatial trend changes, and the correlation analysis was used to discuss the influencing factors on ET change. The results show that the monthly SEBS ET has a good correlation with the mod16A2 data, and the relative error with the field measurement is less than 15%. Therefore, the reliability of the SEBS result is validated to be relatively high. The actual ET of the study area has shown a fluctuating upward trend in the past 20 years. The maximum value of ET appeared in 2013 with the value of 545 mm, and the minimum value was 348 mm in 2002; and the evapotranspiration in Chengde was significantly higher than that in Zhangjiakou; In the past 20 years, the ET of 75.41% of the study area was basically stable, 5.13% of the area increased, 1.11% of the region was significantly decreased and 18.35% of the area was slightly decreased. The temperature and vegetation change have a significant positive correlation with evapotranspiration variation. The ET of different land use types is: forest land>water>grass land>arable land>construction land>unused land. |
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