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[1]Liu Yinge,Luo Ziwei,Guo Huijun,et al.Characteristic of climatic and hydrological variation s in river valley regions based on remote sensing data and associated regional differences[J].Research of Soil and Water Conservation,2025,32(01):181-194.[doi:10.13869/j.cnki.rswc.2025.01.015]

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Characteristic of climatic and hydrological variation s in river valley regions based on remote sensing data and associated regional differences

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 01 Page number: 181-194 Column: Public date: 2025-01-10

Title:: Characteristic of climatic and hydrological variation s in river valley regions based on remote sensing data and associated regional differences

Author(s):: Liu Yinge, Luo Ziwei, Guo Huijun, Li Dandan, Lin Maoqi, Lyu Xinyi; (Key Laboratory of Disaster Monitoring and Mechanism Simulating in Shaanxi Province,College of Geography and Environment,Baoji Universitity of Art and Science,Baoji,Shaanxi 721013,China)

Keywords:: meteorological and hydrological factors; temporal and spatial changes; complete ensemble empirical mode decomposition with adaptive noise method; rescaled range analysis method; remote sensing data

CLC:: P467; K903

DOI:: 10.13869/j.cnki.rswc.2025.01.015

Abstract:: [Objective]This study aims to explore the variation characteristics of climatic and hydrological multi factors in different regions, and to provide regional scientific basis for water resource management and sustainable development and utilization in the area. [Methods]According to the satellite remote sensing data of 9 counties in Baoji area spanning 1950 to 2021, a total of 11 factors including temperature, surface temperature, precipitation, evaporation, low-level cloud cover, total cloud cover, UV intensity, relative humidity, runoff, surface runoff, and groundwater runoff were selected for analysis. The complete ensemble empirical mode decomposition with adaptive noise method(CEEMDAN)and R/S analysis method were used to analyze the spatiotemporal characteristics and regional differences of multiple meteorological and hydrological factors in the past 70 years. This was followed by the discussion on the continuity and future trends of changes in climate and hydrological factors in different regions. [Results](1)The regional annual temperature and ground temperature showed an upward trend, while the annual precipitation, evaporation, low-level cloud cover, total cloud cover, UV intensity, relative humidity, runoff, surface runoff, and groundwater runoff showed a downward trend. Their trend rates were 0.27 ℃/10 a, 0.25 ℃/10 a, -40.97 mm/10 a, -0.59 mm/10 a, -1.14%/10 a, -0.17%/10 a, -4 060.4 J/(m²·10 a), -0.99%/10 a, -3.6 mm/10 a, -1.61 mm/10 a, and-1.94 mm/10 a, respectively. From the aspect of season, the temperature and ground temperature increased the most in winter, and the precipitation decreased the most in summer. In spring, only UV intensity showed an uplift, with the largest decrease in both relative humidity and lower cloud cover. Runoff and surface runoff exhibited the most significant decline in summer, while the underground runoff decreased the most in autumn. All the factors in the Qianlong hilly area varied greatly.(2)Spatially, the regions with high annual temperature, ground temperature, evaporation, and UV intensity are predominantly distributed in the Qianlong hilly area and the Weihe River plateau area. The regions with high annual precipitation, low-level cloud cover, total cloud cover, relative humidity, runoff, surface runoff, and groundwater runoff were primarily located in the Guanshan area of the Qinling Mountains. In addition to the evaporation in Fengxian county and Meixian county, all other factors in each county displayed a consistent upward or downward trend with the entire region.(3)Each meteorological and hydrological factor had an interdecadal oscillation period dominated by 2～3 a, 4～5 a, 7～9 a, 11～13 a, and 19～35 a.(4)All meteorological and hydrological factors in the Baoji area will continue their historical upward or downward trends in the future, but with different durations. The temperature, ground temperature, evaporation, and surface runoff in the Qianlong hilly area, the temperature and surface runoff in the Weihe Chuanyuan area, and the precipitation, relative humidity, runoff, and surface runoff in the Guanshan area of Qinling can last up to 10 a. The UV intensity in the Qianlong hilly area, and the low-level cloud cover in the Weihe Chuanyuan area and the Guanshan area of Qinling can be a minimum of 4 a. [Conclusion]The climate in Baoji area varies towards warming and drying, and the climate and hydrological changes between regions have significant differences, with obvious oscillation periods and positively persistent characteristics.

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Last Update: 2025-01-10