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Temporal characteristics detection and attribution analysis of hydrological time-series variation in the seagoing river of southern China under environmental change

  • Research Article - Hydrology
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Abstract

Environmental changes have led to a growing conflict between water supply and demand in Qinjiang River. This paper used the data of monthly rainfall, runoff, evaporation and air temperature during the period from 1956 to 2016 and combined 3-year running mean, linear regression method, Mann–Kendall test and R/S analysis method to analyze the change trend of each factor, combined Mann–Kendall test, cumulative anomaly method and slide t test to analyze the variation of each factor and combined Morlet continuous wavelet analysis to identify periodic oscillations. In this paper, the influences of climate change and human activities on the runoff of the Qinjiang River were qualitatively assessed from the aspects of trend, variation and periodicity and the contributions of climate change and human activities to runoff reduction were quantitatively assessed using evaporation difference method and an improved comparative method of the slope changing ratio of cumulative quantity (SCRCQ).The following results were obtained: (1) From 1956 to 2016, the rainfall showed a weak increasing trend, whereas the runoff depth and the evaporation exhibited significant decreasing trend and the air temperature exhibited a significant increasing trend. The rainfall and air temperature will continuously increase, whereas runoff and evaporation will continuously decrease in the future. (2) Rainfall exhibited no significant variation, whereas there were two variation points (1986 and 2003) in the runoff, three variation points (1974, 1986 and 2011) in evaporation and one variation point (1996) in air temperature. (3) Features of rainfall exhibited similarities to periodic changes in runoff, whereas rainfall exhibited significant difference with evaporation and air temperature. (4) Human activities contributed mainly to the runoff reduction. The contribution of human activities to runoff reduction increased from 43.78 to 61.17% in BR period (1983–2003) and increased from 61.17 to 72.66% in CR period (2004–2016). This indicated that the contribution of human activities to runoff reduction increased continuously. The impact of human activities on the reduction in runoff in the Qinjiang River Basin is mainly due to the irrigation, industrial and urban residents’ water use, which is caused by the growth of population and the growth of economic index.

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Acknowledgements

This research was supported by National Key Research and Development Program of China (Grant No. 2017YFC0405900), the National Natural Science Foundation of China (Grant Nos. 51469002 and 51669003) and Guangxi Provincial Natural Science Foundation (Grant No. AB16380284).

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Correspondence to Yan Wang.

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The authors declare that they have no conflicts of interest with respect to the research, authorship and/or publication of this article.

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Chen, L., Wang, Y., Touati, B. et al. Temporal characteristics detection and attribution analysis of hydrological time-series variation in the seagoing river of southern China under environmental change. Acta Geophys. 66, 1151–1170 (2018). https://doi.org/10.1007/s11600-018-0198-y

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  • DOI: https://doi.org/10.1007/s11600-018-0198-y

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