Arid Zone Research ›› 2024, Vol. 41 ›› Issue (11): 1842-1852.doi: 10.13866/j.azr.2024.11.05

• Land and Water Resources • Previous Articles     Next Articles

Runoff trends and influencing factors at Caiqi hydrological station in the lower reaches of Shiyang River

HU Guanglu1,2(), FAN Yalun1, TAO Hu3, LI Haochen1, YANG Penghua1   

  1. 1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu,China
    2. Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou 730070, Gansu, China
    3. College of Resources and Environment, Lanzhou University, Lanzhou 730000, Gansu, China
  • Received:2024-06-17 Revised:2024-08-19 Online:2024-11-15 Published:2024-11-29

Abstract:

The lower reaches of the Shiyang River are the most serious resource-based water shortage areas, and water resources have a significant restraining effect on local social and economic development. Based on the runoff sequence data of the Caiqi hydrological station in Shiyanghe from 1956 to 2020, the sliding t-method, cumulative anomaly method, and M-K mutation test method were used to analyze the trend and abrupt year of runoff at the Caiqi hydrological station. The periodic change of runoff was analyzed using the Morlet wavelet method, and the factors influencing runoff change were analyzed by the double cumulative curve and correlation analysis methods. The results indicated that from 1956 to 2020, the annual runoff of the Caiqi hydrological station decreased and then increased; the runoff in spring, summer, and autumn decreased first and then increased, while winter displayed a decreasing trend. The runoff of the Caiqi hydrological station was studied for 46 years as the main period, which existed during the whole study period, and the fluctuation of abundance and drought changed significantly. The runoff of the Caiqi hydrological station occurred in two apparent mutations in 1972 and 2010, and it decreased significantly after the first mutation and increased considerably after the second mutation. Under the background of regional climate change, human activities, such as land use change, cross-basin water diversion, adjustment of industrial and planting structures, and water conservation in irrigation areas, are the principal reasons for the runoff change at the Caiqi hydrological station. The results can provide a scientific basis for the river basin management department to formulate a rational water resource allocation and transfer plan.

Key words: runoff changes, Morlet wavelet, mutation testing, climatic change, human activities