[1]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]
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Spatial and Temporal Evolution Characteristics of Potential Evapotranspiration in Huai River Basin Based on Empirical Orthogonal Function Analysis
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 06
Page number:
264-273
Column:
Public date:
2023-10-10
- Title:
- Spatial and Temporal Evolution Characteristics of Potential Evapotranspiration in Huai River Basin Based on Empirical Orthogonal Function Analysis
- Keywords:
- Huai River Basin; potential evapotranspiration; empirical orthogonal function; spatiotemporal distribution
- CLC:
- P339
- DOI:
- 10.13869/j.cnki.rswc.2023.06.044
- 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.
- References:
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Last Update:
2023-10-10