tailieunhanh - Methodology of determining effective porosity and longitudinal dispersivity of aquifer and the application to field tracer injection test in Southern Hanoi, Vietnam

The distortion flow coefficient αW (the ratio between the flow rate through the injection well section without its presence) and the groundwater flow into the tracer injection well is from (at the early testing time) to (at the later testing time). | Vietnam Journal of Earth Sciences, 39(1), 58-75, DOI: Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences (VAST) Methodology of determining effective porosity and longitudinal dispersivity of aquifer and the application to field tracer injection test in Southern Hanoi, Vietnam Tong Ngoc Thanh1, Trieu Duc Huy1, Nguyen Van Kenh1, Tong Thanh Tung1, Pham Ba Quyen1, Nguyen Van Hoang2* 1 Vietnam National Center for Water Resources Planning and Investigation 2 Institute of Geological Sciences, Vietnam Academy of Science and Technology Received 21 November 2016. Accepted 8 February 2017 ABSTRACT Groundwater field pumping out and tracer injection test had been carried out at Nghiem Xuyen commune, Thuong Tin district, Hanoi where salinized and fresh groundwater boundary exist in the Pleistocene aquifer. The test was executed with pumping out rate of 9l/sec and tracer injection rate of of water with the salt concentration of 5g/l. The interpretation and analysis of the groundwater solute transport parameters by the field pumping out and tracer injection test is a rather complicated and delicate task due to the variability of the temporal boundary conditions. The test results have shown that although the tracer injection time is rather long (up to 60 hours), the tracer breakthrough curve of the tracer concentration of the pumped out water has its very specific characteristic shape, however with some variation due to the test invisible variability of conditions. The results of the parameter identification based on the method of least squares have given effective porosity of and longitudinal dispersivity of (which give the hydrodynamic dispersion of from D=250m2/day right outside the pumping well screen to D=18m2/day right outside the injection well screen). The minimal sum of squares of the differences between the observed and model normalized tracer concentration .

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• Longitudinal dispersivity of aquifer
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