Abstract
In this study, we thoroughly analyzed spatial and temporal distributions of runoff and their relation with precipitation changes based on monthly runoff dataset at 25 hydrological stations and monthly precipitation at 127 stations in Guangdong Province, south China. Trends of the runoff and precipitation are detected using Mann–Kendall trend test technique. Correlations between runoff and precipitation are tested using Spearman’s and Pearson’s correlation coefficients. The results indicate that: (1) annual maximum monthly runoff is mainly in decreasing tendency and significant increasing annual minimum monthly runoff is observed in the northern and eastern Guangdong Province. In addition, annual mean runoff is observed to be increasing at the stations located in the West and North Rivers and the coastal region; (2) analysis of seasonal runoff variations indicates increasing runoff in spring, autumn and winter. Wherein, significant increase of runoff is found at 8 stations and only 3 stations are dominated by decreasing runoff in winter; (3) runoff changes of the Guangdong Province are mainly the results of precipitation changes. The Guangdong Province is wetter in winter, spring and autumn. Summer is coming to be drier as reflected by decreasing runoff in the season; (4) both precipitation change and water reservoirs also play important roles in the increasing of annual minimum monthly streamflow. Seasonal shifts of runoff variations may pose new challenges for the water resources management under the influences of climate changes and intensifying human activities.
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Acknowledgments
This work is financially supported by the Key International Collaboration Project (Grant No.: 51320105010), the Leading Expert Program of Anhui Province, China, and is fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. CUHK441313). Our cordial gratitude is also extended to the editor, Prof. Dr. Clemens Simmer, and also three anonymous reviewers for their professional and pertinent comments and suggestions which are greatly helpful for further improvement of the quality of this manuscript. Besides, we again owe our special thanks to the editor, Prof. Dr. Clemens Simmer, for his hard work and his great efforts in processing this manuscript.
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Zhang, Q., Xiao, M., Singh, V.P. et al. Variations of annual and seasonal runoff in Guangdong Province, south China: spatiotemporal patterns and possible causes. Meteorol Atmos Phys 127, 273–288 (2015). https://doi.org/10.1007/s00703-014-0360-2
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DOI: https://doi.org/10.1007/s00703-014-0360-2