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Open AccessArticle

Evaluation of the Stability and Suitable Scale of an Oasis Irrigation District in Northwest China

1
College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
2
Hubei Agricultural Planning and Design Institute, Wuhan 430070, China
3
School of Civil Engineering and Architecture, Zhengzhou University of Aeronautics, Zhengzhou 450000, China
4
Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou 730000, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(10), 2837; https://doi.org/10.3390/w12102837
Received: 28 August 2020 / Revised: 4 October 2020 / Accepted: 5 October 2020 / Published: 13 October 2020
(This article belongs to the Special Issue Water Security and Governance in Catchments)
Oases support human activities in arid and semiarid regions, and their stability is important for regional sustainable development and water resource management. Water consumption is the major factor affecting the stability of oases. On the basis of remote sensing images, evaporation and socioeconomic data, this study first evaluates the stability of the Dunhuang Oasis against the expansion of an oasis irrigation district and planting structure changes from 1987 to 2015. Next, it calculates a suitable area of the oasis irrigation district using water–energy balance theory. The results are as follows: (1) During the 1987–2015 period, with the expansion in the oasis irrigation area, the planting structure underwent a marked transformation from food crops to cash crops to orchards. Water consumption pattern likewise changed considerably. (2) The stability of the Dunhuang Oasis continued to weaken from 0.54 in 1987 until it reached a dangerously unstable level of 0.17 in 2010. With the implementation of water-saving measures and a water-transfer project, the stability of the Dunhuang Oasis irrigation district increased to a metastable level of 0.22 in 2015. (3) Setting the stability are 0.5 of a stable level and 0.75 of an extremely stable level, and the oasis irrigation district should be impractical and reduced by 168 and 241 km2 to attain a suitable oasis ecosystem scale. Hence, at present, the water-transfer project is the most practical way to increase allocated water resource to the oasis irrigation district for improving its stability. View Full-Text
Keywords: oasis irrigation district; stability evaluation; suitable scale oasis irrigation district; stability evaluation; suitable scale
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Zhang, X.; Zhang, Y.; Qi, J.; Wang, Q. Evaluation of the Stability and Suitable Scale of an Oasis Irrigation District in Northwest China. Water 2020, 12, 2837.

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