Inverse analysis for transmissivity and the Red river bed's leakage factor for Pleistocene aquifer in Sen Chieu, Hanoi by pumping test under the river water level fluctuation

Trieu Duc Huy, Tong Ngoc Thanh, Nguyen Van Lam, Nguyen Van Hoang
Author affiliations

Authors

  • Trieu Duc Huy Vietnam National Center for Water Resources Planning and Investigation
  • Tong Ngoc Thanh Vietnam National Center for Water Resources Planning and Investigation
  • Nguyen Van Lam Hanoi University of Geology and Mining
  • Nguyen Van Hoang Institute of Geological Sciences, Vietnam Academy of Science and Technology

DOI:

https://doi.org/10.15625/0866-7187/40/1/10877

Keywords:

Group-well pumping test, Pleistocene aquifer, Riverbed resistance, Leakage factor

Abstract

Aquifer parameters and riverbed hydraulic resistance to an aquifer have an important role in the quantitative assessment of groundwater sources, especially the aquifer recharge from river. The analytical determination of aquifer parameters and riverbed hydraulic resistance to the aquifer is rather complicated in case if the water level in the river fluctuates before and during the pumping test time. This is especially true for Pleistocene aquifer along the Red River in Hanoi city, where the riverbed has been changed very much during the recent decades. A trial-error inverse analysis in the parameters' determination by a group pumping test data obtained with a test located close to the Red river bank in Sen Chieu area, Phuc Tho district, Hanoi city was carried out. Before and during the pumping test time the water level in the river changed five times. The results have shown that the Pleistocene aquifer has a relatively high hydraulic conductivity of 55.5 m/day, which provides a good role in the transport of a large volume of water recharged by the river to the abstraction wells located near the river. The aquifer storage coefficient had lightly decreased with the pumping time, which is corresponding to the physical nature of that the aquifer stativity is a function of the aquifer pressure. A special point is worthwhile to be noted that the Red river bed resistance to the Pleistocene is very low, about 0.537 days, which is corresponding to the increase of the distance from the river bank further from the well in 28.4 m to have the river as a specified water level boundary of the aquifer. In contrast, the 1990's investigations had found that the Red river bed resistance to the Pleistocene aquifer to be about 130 days (Tran Minh, 1984), which is corresponding to the increase of the distance from the river bank further from the well in a thousand of meters to have the river as a specified water level boundary for the aquifer.

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How to Cite

Huy, T. D., Thanh, T. N., Lam, N. V., & Hoang, N. V. (2018). Inverse analysis for transmissivity and the Red river bed’s leakage factor for Pleistocene aquifer in Sen Chieu, Hanoi by pumping test under the river water level fluctuation. Vietnam Journal of Earth Sciences, 40(1), 26–38. https://doi.org/10.15625/0866-7187/40/1/10877

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