PROGRESS IN GEOGRAPHY ›› 2018, Vol. 37 ›› Issue (7): 912-922.doi: 10.18306/dlkxjz.2018.07.005

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Mathematical fitting of influencing factors and measured groundwater level: Take Keriya River Basin in Hetian area as an example

Qian SUN(), BAIDOURELA·Aliya   

  1. College of Forestry and Horticulture, Xinjiang Agriculture University, Urumqi 830052, China
  • Received:2017-06-06 Revised:2017-12-20 Online:2018-07-28 Published:2018-07-28
  • Supported by:
    National Natural Science Foundation of China, No.31600572


The change of Earth's gravity field is an important factor that leads to the change of terrestrial water storage. Using GRACE (gravity recovery and climate experiment) gravity field recovery and climate experiment gravity satellite data, combined with GLDAS (global land data assimilation systems) global land surface data assimilation system and measured groundwater level data, inversion of the dynamic changes of terrestrial water storage in the Hetian area during four seasons in 11 years was simulated and the trend of change in equivalent water height was calculated, and the estimation model of groundwater level was constructed. The results indicate that the terrestrial water storage showed an increasing trend in the Hetian area in the spring and summer, in contrast to the autumn and winter; inversion of the terrestrial water storage by GRACE is more intense than simulation of the water resources change by GLDAS, but correlation of the dynamic changes of the two kinds of data is very high; equivalent water height by GLDAS second order differential, change of water resources by GLDAS reciprocal first order differential, change of terrestrial water reserves by GRACE reciprocal transformation, and change of groundwater reserves first order differential are most sensitive, and the stepwise regression model is superior to the linear function. The lower the water level, the higher the applicability of the stepwise regression estimation model.

Key words: gravity recovery and climate experiment(GRACE), global land data assimilation systems(GLDAS), water resources, Hetian area, Keriya River Basin