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| DOI：10.13522/j.cnki.ggps.2025084 |
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| Variation of streamflow and its driving factors in the Shiyang River Basin |
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SU Qiang
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Gansu Wuwei Hydrological and Water Resources Survey Center, Wuwei 733000, China
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| Abstract: |
| 【Objective】The Shiyang River Basin is a typical arid and semi-arid inland river basin in Northwestern China; it provides water resources to maintain ecological security and agricultural production. However, global climate change, compounded by intensified human activities, over the past decades has significantly shifted runoff and posed a challenge to water resource stability and ecosystem sustainability in the region. This paper analyses the dynamic changes in the runoff, as well as the underlying driving factors.【Method】The analysis was based on hydrological data measured from 1956 to 2023 at the Caiqi Hydrological Station. The Mann-Kendall mutation test and the sliding T-test were used to identify temporal changes in the runoff. The double mass curve method and statistical analysis were used to identify factors that influence temporal variation in the runoff. 【Result】The annual runoff in the basin showed three distinct periods from 1956 to 2023: shift from wet to normally dry, before becoming normally wet again. There was an abrupt change in the runoff in 1971, where the annual runoff decreased by approximately 50% compared to that before 1971. From 1956 to 2023, annual runoff in the basin decreased at an average rate of 0.04 billion m3/year. Our results indicated that the increase in irrigation water consumption was the primary driver of the runoff decrease. Additionally, increase in hydropower stations, cultivated land and deforestation also added a negative impact on the runoff. 【Conclusion】Increases in agricultural water use and change in land use are the key factors that result in the runoff decline in the Shiyang River Basin. |
| Key words: runoff volume; variation diagnosis; Mann-Kendall mutation test; Shiyang River Basi |
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