Study on spatial and temporal variation of groundwater depth and its influencing factors in Hetao Irrigation District
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Abstract:
In recent years,due to the irrational utilization of groundwater,soil salinization has occurred in some arid and semiarid regions of China.In this research,the spatial and temporal variations of groundwater depth and its main influencing factors were analyzed from 1990 to 2015 based on 67 monitoring wells in Yichang Irrigation Subdistrict.Statistical analysis,geostatistics and grey correlation analysis were applied to analyzing these data.The results reveal that:(1) the average phreatic level in Yichang Irrigation Sub-district has dropped by nearly 0.4 m in 26 years,and the average decline rate is 1.6 cm/a;(2) the optimal variogram of groundwater depth in the last 26 years has Gaussian, exponential and spherical model,however,it is dominated by the Gaussian model.The regional variation of groundwater depth has strong spatial correlation,and the variation ranges from 5 to 7 km;(3) the spatial interpolation results show that there has certain difference in the spatial distribution of groundwater depth in different periods,while the overall range is from 1.5 to 2.5 m;with an average proportion of 60%;(4) evaporation and groundwater recharge are the main driving factors for the variation of groundwater depth in Yichang Irrigation Sub-district based on the grey correlation analysis and partial correlation analysis.
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