Dynamic response test of vadose zone and groundwater in typical Yellow River irrigation area
[Objective]The dynamic response test is carried out to study the conversion process and rule of"irrigation water-va-dose zone water-groundwater"caused by irrigation recharge in Yinchuan Plain.[Methods]The paddy field in typical irrigated area of Yellow River diversion is taken as the research object,and the observation data of in-situ test is analyzed by using the the-ories of hydrogeology and soil hydrodynamics.Statistical analysis softwares such as Origin and SPSS is used for data processing,and numerical simulation software such as Hydrus-1D and Surfer is used for fitting and interpolation analysis.[Results]In analy-sis result,there is a certain correlation between water and negative pressure at each buried depth in the process of irrigation,and the correlation coefficient is more than 0.9;The soil-water characteristic curve in the field is fitted with Hydrus-1D,and it is found that continuous fitting curve can be obtained only by superposing each buried deep level;In multiple irrigation infiltration tests,the dynamic response of groundwater caused by the first infiltration is the fastest,the response time is 388.8 min after irri-gation;The groundwater irrigation response method is used to quantitatively measure the field irrigation infiltration capacity,and the average field infiltration coefficient is calculated to be 0.202.By interpolation analysis of groundwater level dynamics,it is found that recharge gradually forms a"water hill"center,and the groundwater flow field changes accordingly.Through the sta-tistical analysis of groundwater recharge sources,the annual contribution rate to groundwater recharge is 79％by irrigation water in the Yellow River irrigation area.[Conclusion]The situ field experiments are carried out to further clarify the characteristics of the vadose zone and the response process of groundwater.The Yellow River irrigation has a decisive role in the groundwater re-charge and flow field characteristics in the irrigation area.It is provided some scientific support for improving the utilization rate of the Yellow River diversion water and the assessment,management and control of vadose zone and groundwater resources.
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