img

Wechat

Adv search

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (4): 231-240.DOI: 10.7522/j.issn.1000-694X.2023.00009

Previous Articles    

Ecological water conveyance effect in the lower reaches of Tarim River

Yongpeng Wang1,2(), Alimujiang2, Long Zhou1, Pengnian Yang1(), Siyang Feng1,3, Yanwen Wang4   

  1. 1.College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China
    2.Xinjiang Water Development Investment Group,Urumqi 830000,China
    3.Institute of Hydrology and Water Resources,Nanjing Institute of Water Resources Sciences,Nanjing 210029,China
    4.Water Conservancy and Hydropower Survey and Design Institute of Tacheng District,Tacheng 834700,Xinjiang,China
  • Received:2022-12-09 Revised:2023-02-20 Online:2023-07-20 Published:2023-08-14
  • Contact: Pengnian Yang

Abstract:

The ecological water conveyance effect in the lower reaches of Tarim River was analyzed to provide scientific guidance for optimizing the allocation strategy of ecological water conveyance. Based on Landsat series images, meteorological data and field drilling data, the land use type and vegetation coverage were interpreted, and the evolution trend of vegetation water consumption and groundwater depth was determined to explore the multiple effects of ecological water transport. The results showed that: (1)From 2000 to 2020, the area and coverage of forest and grassland increased significantly in the lower reaches of the Tarim River, and each 1×108 m3 ecological water corresponded to 5.40 km2 natural vegetation area and 0.14% vegetation coverage increase. (2)From 2000 to 2015, the center of gravity of vegetation water consumption moved along the main stream of Tarim River, and from 2015 to 2020, it moved to the natural overflow area, with a total of 4 359 m to the southeast. (3)The groundwater level in the natural overflow area increased by 5 m, the groundwater level in the 2 km area along the main river increased by 1-3 m, and the groundwater level in the 2-5 km area outside the river increased by 0-1 m. (4)The suitable water consumption of natural vegetation is about 200 mm·a-1. In the early stage of ecological water transport, there is only inefficient dissipation in the local area along the main river channel, and in the later stage, a large number of natural overflow areas are concentrated. The 21-year ecological water conveyance practice shows that: The natural vegetation was significantly improved, the groundwater level was significantly increased, and the ecological water conveyance effect was significant. However, due to the restriction of the solidification of the existing water conveyance mode, the spatial distribution of ecological water quantity is not balanced and the inefficient dissipation, and the ecological water conveyance mode still has the necessity of optimization.

Key words: lower reaches of Tarim River, vegetation restoration, groundwater depth, characteristics of vegetation water consumption, ecological water conveyance effect

CLC Number: