Chinese Journal of Agrometeorology ›› 2020, Vol. 41 ›› Issue (06): 345-356.doi: 10.3969/j.issn.1000-6362.2020.06.002

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 Spatial and Temporal Variation Characteristics of Blue and Green Water Resources in Min-Tuo River Basin were Analyzed Based on SWAT Model

 ZHANG Yang, DENG Yu, NI Fu-quan, NIE Chao, MA Jie   

  1.  College of Water Conservancy and Hydropower Engineering, Sichuan Agriculture University, Ya'an 625014, China
  • Received:2019-12-06 Online:2020-06-20 Published:2020-06-18
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Abstract:  In recent years, the influenced by global climate change and common human activities, the hydrological cycle has changed into different degrees. In order to better understand the role of water resources in terrestrial ecosystems, the concepts of blue water and green water have been introduced. However, the traditional water resources assessment often focuses on the amount of blue water resources (surface runoff, soil runoff and underground runoff), and the green water (evapotranspiration water and soil water) which is important for the maintenance of terrestrial ecosystems is often neglected. The ecological process of the basin is organically coupled with the water cycle process of the basin through the link of blue and green water, which makes the water cycle and ecological process closely linked, and also reflects the relationship between vegetation and hydrological process.Therefore, this article is based on SWAT model, from the perspective of different land use types and the hydrologic cycle, simulation of large scale he river the blue water, green water resources in 1981-2014, explore he blue green water in time and space distribution characteristics of Min-Tuo river basin, the Man-Kendall (M-K) annual inspection analysis between water resources quantity change trend, simulation of blue green water resources under different land use scenarios. The results showed that :(1)from 1981 to 2014, the amount of green water resources in the Min-Tuo river basin increased, and the M-K statistical value was 0.0232, failing the significance test of M-K confidence degree of 90%. The blue water resources and precipitation in the basin showed a decreasing trend, and the M-K statistical values were -0.1729 and-0.1087, respectively, which failed to pass the significance test of M-K confidence degree of 90%, and the linear variation trend was not significant. (2) The spatial distribution trend of annual precipitation and blue and green water resources in the Min-Tuo river basin from 1981 to 2014 was basically the same. The amount of blue and green water resources in the basin gradually increased from north to south and then decreased, that is, the amount in the middle reaches was the most, followed by the amount in the downstream, and the amount in the upstream was the least. (3) The whole Min-Tuo river basin under the condition of rainfall, forest land, grass blue water resource fluctuations decrease, green water resources increase slowly, and in different land use types, blue, green water resource differences apparent, characterized by cultivated land > forest land > grassland, including arable land accounts for only 25% of total area of the basin, but the blue and green water resource of the contribution of the highest. It is proposed to strengthen the management of cultivated land in the Min-Tuo river basin, rationallutilize the blue and green water resources in the middle and lower reaches, and implement green water credit compensation measures in the arid and semi-arid areas in the upper reaches, so as to optimize the allocation of regional water resources.

Key words:  SWAT model, Min-Tuo River Basin, Land use, Blue water, Green water, M-K test

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