Dynamic characteristics and influence factors of groundwater level in the experimental section of a reservoir
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Abstract:
Doumen reservo ir is an important part of the water diversion and distribution project from the Hanjiang River to the Weihe river in Shaanxi province. The impact of Doumen reservoir's impoundment on regional groundwater dynamics was studied to provide a relevant scientific basis for the later construction of the reservoir and regional water resources management.Through the establishment of the Meteorologicat-Groundwater Monitoring System of the Doumen reservoir experimental section, the dynamic characteristics of the groundwater level were analyzed by the Manr-Kendall test in the study area. The time variation characteristics of the groundw ater level were analyzed by the coefficient of variation method, and the grey correlation md hod was used to reveal its dominant influence factors. The results show that: the overall performance of the groundw ater level in the experimental section of Doumen reservoir is an upward trend and obvious characterist ics of high and dry conditions, with an increase of about 0.5-2.0 m/a; the leakage of the test section was negatively correlated with the change of groundwater level, and the leakage had an effected on groundwater level, there was a certain spatial difference in the impat, that was, the impacd on the water table in the east was greater than that in the west; the dominant influencing factor on the groundwater level was rainfall in the west, and leakage and rainfall were in the east.
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