| 黑河上中游潜在蒸散发模拟及变化特征分析 |
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| 引用本文： | 赵捷,徐宗学,左德鹏.黑河上中游潜在蒸散发模拟及变化特征分析[J].水科学进展,2015,26(5):614-623. |
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| 作者姓名： | 赵捷 徐宗学 左德鹏 |
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| 作者单位： | 北京师范大学水科学研究院水沙科学教育部重点实验室, 北京 100875 |
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| 基金项目： | 国家自然科学基金重大计划重点支持项目(91125015);国家建设高水平大学公派研究生项目(201406040178) |
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| 摘 要： | 基于多源遥感数据产品,利用Shuttleworth-Wallace(S-W)模型估算了黑河上中游流域2000—2010年潜在蒸散发(potential evapotranspiration,ETP),并考虑不同土地覆被类型,分析了ETP的时空变化特征及影响要素,分别利用ETP和ET0驱动水文模型,比较径流模拟精度.结果表明:① 基于高精度遥感数据,S-W模型可模拟区域ETP.黑河上中游流域,夏季ETP对年值的贡献最大,各土地覆被类型的ETP年内变化趋势一致.总体而言,植被条件越好,ETP越小;② 在研究区内,相对湿度对ETP变化的影响最大,叶面积指数(LAI)对ETP变化的影响与辐射相近.植被越稀疏,ETP对气象要素及LAI的敏感性越强;③ 与ET0相比,ETP能够更好地描述陆面蒸散发能力,相同条件下使用ETP驱动水文模型模拟精度更高.
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| 关 键 词： | 土地覆被 潜在蒸散发量 Shuttleworth-Wallace模型 黑河 |
| 收稿时间： | 2015-01-14 |
Estimation of potential evapotranspiration and its variability in the upper and middle reaches of the Heihe River basin |
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| ZHAO Jie,XU Zongxue,ZUO Depeng.Estimation of potential evapotranspiration and its variability in the upper and middle reaches of the Heihe River basin[J].Advances in Water Science,2015,26(5):614-623. |
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| Authors: | ZHAO Jie XU Zongxue ZUO Depeng |
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| Affiliation: | College of Water Sciences, Key Laboratory of Water and Sediment Science, Ministry of Education, Beijing Normal University, Beijing 100875, China |
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| Abstract: | On the basis of the MODIS LAI remote sensing products, China Meteorological Forcing Dataset and other multi-source datasets, the Shuttleworth-Wallace (S-W) model, which considers the temporal variation of leaf area index (LAI), was applied to estimate potential evapotranspiration (ETP) during the period of 2000-2010 in the upstream and midstream areas of the Heihe River basin. To investigate the temporal and spatial variability of ETP, sensitivity of ETP to meteorological parameters and LAI was calculated for each land cover type. To compare ETP and ET0 values for runoff simulation, a conceptual hydrologic model with precipitation and ETP or ET0 was developed in the upstream area of the Heihe River basin. Results showed that: ① S-W model, based on high-resolution remote sensing datasets, was able to accurately estimate annual and seasonal ETP in large river basins with complex underlying surfaces as well as in ungauged basins. The values of ETP in summer contributed more to the annual value than those of other seasons. ETP in areas with different land cover types varied greatly. Generally speaking, ETP decreased with the development of vegetation. ② In the study area, ETP was most sensitive to relative humidity. The sensitivity of ETP to LAI was as great as that to net solar radiation. The sensitivity of ETP to meteorological parameters and LAI became greater with the decline of vegetation. ③ Compared with hydrologic model with ET0 calculated by P-M model, the model with ETP better simulated the depth of runoff at Yingluoxia hydrologic station. Hence, ETP calculated by S-W model was more suitable for the simulation of runoff in the present study. |
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| Keywords: | land cover potential evapotranspiration Shuttleworth-Wallace model Heihe River |
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