Arid Zone Research ›› 2024, Vol. 41 ›› Issue (12): 2045-2055.doi: 10.13866/j.azr.2024.12.07

• Land and Water Resources • Previous Articles     Next Articles

Trend change and prediction of blue-green water in the Jinghe River Basin under climate change

ZHANG Jiaqi1,2,3(), LIU Zhao1,2,3(), HAN Zhongqing1,2,3, WANG Lixia4, ZHANG Jinxia1,2,3, YUE Jiayin1,2,3, GUAN Zilong5   

  1. 1. School of Water and Environment, Chang’an University, Xi’an 710054, Shaanxi, China
    2. Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of the Ministry of Education, Chang’an University, Xi’an 710054, Shaanxi, China
    3. Key Laboratory of Eco-hydrology and Water Security in Arid and Semi-arid Regions of Ministry of Water Resources, Chang’an University, Xi’an 710054, Shaanxi, China
    4. College of Geological Engineering and Geomatics, Chang’an University, Xi’an 710054, Shaanxi, China
    5. Powerchina Northwest Engineering Corporation Limited, Xi’an 710065, Shaanxi, China
  • Received:2024-04-21 Revised:2024-09-21 Online:2024-12-15 Published:2024-12-20
  • Contact: LIU Zhao E-mail:zjq18991324073@163.com;lz975@163.com

Abstract:

In this study, we analyzed meteorological data from 1980 to 2020, hydrological runoff data, and future climate models from CMIP6 in the Jinghe River Basin. The CMIP6 climate data was processed using the delta downscaling method and coupled with the Soil and Water Assessment Tool hydrological model to investigate the variations in blue-green water due to climate change in the basin. The results showed that under the SSP1-2.6 pathway, the blue-green water content in the study area exhibited an insignificant upward trend. Under the SSP3-7.0 pathway, the blue water content showed an insignificant downward trend, while the green water content showed a significant upward trend. Similarly, under the SSP5-8.5 pathway, the blue water content showed an insignificant downward trend, and the green water content also exhibited an insignificant upward trend. The average annual blue water volume under the three pathways decreased compared to the historical period, with annual averages of 128.8 mm, 117.2 mm, and 126 mm, respectively. Conversely, the average annual green water volume increased, recording values of 372.7 mm, 369.3 mm, and 372.1 mm, resulting in a green water coefficient higher than that of the historical period. The spatial distribution of blue-green water increased from northwest to southeast, with consistent spatial distribution characteristics across each pathway.

Key words: SWAT model, Delta downscaling, climate change, CMIP6 climate model, blue-green water, Jinghe River Basin