干旱区研究

Arid Zone Research >

2023 , Vol. 40 >Issue 3: 381 - 391

DOI: https://doi.org/10.13866/j.azr.2023.03.05

Land and Water Resources

Effects of climate and land use change on the spatial distribution of hydrological factors in the source region of Datong River

  • Meiliang ZHAO ,
  • Guangchao CAO ,
  • Qinglin ZHAO ,
  • Shengkui CAO
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  • 1. Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining 810008, Qinghai, China
    2. Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation, Ministry of Education, Qinghai Normal University, Xining 810008, Qinghai, China
    3. Academy of Plateau Science and Sustainability People’s Government of Qinghai Province & Beijing Normals University, Xining 810008, Qinghai, China

Received date: 2022-09-01

  Revised date: 2022-12-02

  Online published: 2023-03-31

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Abstract

Water shortage has become a major resource and environmental challenge worldwide. Climate and land use change have made the evolution of current hydrological factors complex and uncertain. Exploring the spatial distribution characteristics of hydrological factors under dynamic scenarios is of vital theoretical and practical significance for the sustainable development of regional economy and society. The meteorological and hydrological data of the Datong River source region from 1960 to 2019 were used in this study to quantitatively analyze the spatial distribution characteristics of hydrological elements under climate and land use change scenarios based on model simulation and scenario segmentation. The results showed that: (1) After calibration and verification of the SWAT model, the coefficient of determination, Nash coefficient, and percentage bias (PBIAS) all met the model requirements of 0.81%, 0.79%, and -0.8% in the rate period, and 0.81%, 0.75%, and 15.8% in the validation period, respectively, which indicated that the model had good applicability in the headwaters of the Chase River. (2) Obvious spatial heterogeneity of hydrological elements was detected in the headwater area of Datong River, and a single hydrological element could not represent the overall spatial distribution. Precipitation, potential evapotranspiration, and soil water content decreased with the increase in altitude, while surface runoff and water yield increased with the increase in altitude. (3) The spatial distribution of hydrological factors under the three scenarios were generally consistent, while the spatial distribution of water yield was greatly affected by the land use change. Under the climate change scenario, the actual evapotranspiration and soil water content showed a downward trend, while the surface runoff and water yield showed an upward trend. Under the land use change scenario, the changes of hydrological elements were contrary to these observations.

Key words： hydrological elements; spatial distribution; SWAT model; Datong River

Cite this article

Meiliang ZHAO , Guangchao CAO , Qinglin ZHAO , Shengkui CAO . Effects of climate and land use change on the spatial distribution of hydrological factors in the source region of Datong River[J]. Arid Zone Research, 2023 , 40(3) : 381 -391 . DOI: 10.13866/j.azr.2023.03.05

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