Liu Saiyan,Zhang Yichi,Hu Jiawei,et al.Spatial and Temporal Evolution Characteristics of Potential Evapotranspiration in Huai River Basin Based on Empirical Orthogonal Function Analysis[J].Research of Soil and Water Conservation,2023,30(06):264-273.[doi:10.13869/j.cnki.rswc.2023.06.044]
基于EOF的淮河流域潜在蒸散发时空演变特征研究
- Title:
- Spatial and Temporal Evolution Characteristics of Potential Evapotranspiration in Huai River Basin Based on Empirical Orthogonal Function Analysis
- 文章编号:
- 1005-3409(2023)06-0264-10
- Keywords:
- Huai River Basin; potential evapotranspiration; empirical orthogonal function; spatiotemporal distribution
- 分类号:
- P339
- 文献标志码:
- A
- 摘要:
- [目的]揭示流域潜在蒸散发(ET0)时空演变规律,阐明淮河流域ET0变化的主要原因,为淮河流域水资源管理、干旱评估及农业用水评估和规划等提供参考研究。[方法]基于淮河流域内及其周边29个气象站点1960—2020年逐日实测气象数据,采用Penman-Monteith公式、Mann-Kendall法研究了ET0的基本变化趋势,并运用经验正交函数分解法(EOF)分解了流域各站点组成的ET0矩阵,得到流域年和四季ET0气象场的时空分布结构,通过分析典型分布模态对应的时间系数揭示了流域ET0气象场的变化规律。[结果]流域年ET0多年均值为858.4 mm,除春季外,其他三季和年ET0均呈下降趋势。流域年ET0整体以同增同减、流域西北和东南区域反相变化两种空间分布模态为主,其中,模态一以1980年为界,有从“全流域高ET0”的空间分布形式转变为“全流域低ET0”的显著变化趋势; 模态二也有从“西北ET0偏高东南ET0偏低”向“西北ET0偏低东南ET0偏高”的显著变化趋势。流域四季ET0整体以同增同减的空间分布为主,流域年ET0空间分布模态的转变主要是由夏季ET0的空间模态转变造成的。[结论]淮河流域ET0时空变化存在明显的季节和区域性差异,夏季ET0对年ET0的变化贡献率最大,显著减少的日照时数和风速是导致流域存在“蒸发悖论”的主要原因,未来可针对性地加强夏季蒸散发的实际观测和研究。
- Abstract:
- [Objective] The aim of this study is to reveal the temporal and spatial evolution of potential evapotranspiration(ET0)and clarify the main causes of ET0 change in the Huai River basin, then to provide reference research for water resources management, drought assessment and agricultural water use assessment and planning in this basin. [Methods] Based on the daily meteorological data of 29 meteorological stations in and around the Huai River basin from 1960 to 2020, the basic change trend of ET0 was studied by using Penman-Monteith formula and Mann-Kendall method, and the ET0 matrix composed of each station in the basin was decomposed by empirical orthogonal function decomposition(EOF), and the spatial and temporal distribution structure of ET0 meteorological field in the basin of the year and four seasons was obtained. By analyzing the time coefficient corresponding to the typical distribution mode, the change law of ET0 meteorological field in the basin was revealed. [Results] The annual mean value of ET0 in the basin was 858.4 mm. Except in spring, the ET0 of other three seasons and of the year showed a downward trend. The annual ET0 of the basin mainly had two spatial distribution modes: the same increase and decrease, and the reverse change in the northwest and southeast regions of the basin. Among them, the first mode was bounded by 1980, with a significant change trend from the spatial distribution form of ‘high ET0 in the whole basin' to ‘low ET0 in the whole basin'; Mode 2 also had a significant change trend from ‘higher ET0 in the northwest and lower ET0 in the southeast' to ‘lower ET0 in the northwest and higher ET0 in the southeast'. The spatial distribution of ET0 in the four seasons took the same increase and decrease as the main trend as a whole. The change of annual ET0 spatial distribution mode was mainly caused by the change of summer ET0 spatial mode. [Conclusion] There were obvious seasonal and regional differences in the spatiotemporal changes of ET0 in the Huai River basin. Summer ET0 had the largest contribution to the annual ET0 change. Significantly reduced sunshine hours and wind speed were the main reasons for the existence of the ‘evaporation paradox' in the basin. In the future, the actual observation and research of summer evapotranspiration should be strengthened pertinently.
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备注/Memo
收稿日期:2022-10-27 修回日期:2022-11-13
资助项目:国家自然科学基金项目(52009116); 江苏省高效节能大型轴流泵站工程研究中心开放课题(ECHEAP014); 江苏省自然科学基金项目(BK20200958; BK20200959); 中国博士后科学基金项目(2018M642338); 扬州大学本科生科创基金(2022年扬州大学水利学院13号)
第一作者:刘赛艳(1990—),女,江西东乡人,博士,讲师,主要从事水文过程研究。E-mail:Liusaiyan@yzu.edu.cn