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Arid Land Geography ›› 2023, Vol. 46 ›› Issue (8): 1260-1268.doi: 10.12118/j.issn.1000-6060.2022.558

• Climatology and Hydrology • Previous Articles     Next Articles

Characteristics of flood changes in mountainous areas of upper Shule River from 1956 to 2021

WANG Xueliang1,2,3(),CHEN Rensheng1(),LIU Junfeng1,CAO Shanshan4   

  1. 1. Qilian Alpine Ecology and Hydrology Research Station, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Pingliang Hydrological Station of Gansu Province, Pingliang 744000, Gansu, China
    4. Hydrological Station of Gansu Province, Lanzhou 730000, Gansu, China
  • Received:2022-10-23 Revised:2023-02-03 Online:2023-08-25 Published:2023-09-21

Abstract:

Based on measured flood data for 1956—2021 from the Changmabao hydrological station at the outlet of the Changma River in the upper reaches of the Shule River, northwest China, and on temperature and precipitation data from Yu’erhong rainfall station and Tuole meteorological station in the vicinity of the basin, the variation characteristics of annual maximum peak discharge (AMPD), peaks over threshold (POT3M), and floods based on the generalized extreme value (GEV) distribution at different levels were sampled and analyzed using Sen’s slope estimator and the Mann-Kendall test. The results showed the following: (1) Both the magnitude and frequency of floods at the Changmabao hydrological station during the studied period significantly increased, with AMPD and POT3M magnitudes showing highly significant increases (P<0.01) and POT3M frequency showing significant increases (P<0.05). Based on the GEV distribution, floods were mainly small floods and the frequency of total floods was highly significant (P<0.01). (2) Temperature and precipitation showed a fluctuating increasing trend after 1987, and heavy precipitation and increased meltwater from glaciers, alpine snow, and permafrost due to warming were the main causes of the observed significant increases in flood magnitude and frequency in the three sampled series.

Key words: Shule River, Changmabao hydrological station, flood, variation characteristics