Hydrogeophysics Techniques to Aquifer Locating and Monitoring for Industrial Zone North Thanglong and Quangminh, Hanoi

Giảng, Nguyễn Văn; Duan, Nguyen Ba; Thanh, Lê Ngọc; Hida, Noboru

doi:10.15625/0866-7187/36/3/5905

Cited by 1 publication

(1 citation statement)

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“…Tong Ngoc Thanh et al (2017) and Nguyen The Chuyen (2017) have presented some arguments of wrong utilization of of a single Pleistocene confined aquifer without leakage from underlying Neogene aquifer in Thuong Tin district and Mo Lao-Ha Dong areas in determination of the Pleistocene aquifer transmissivity. Besides, the study of true hydrogeological aquifer structure is very important including the determination of the Groundwater level change during pumping test relatively to the groundwater level at the pumping started (at t=0): A 0 =0.503 days; T=1511.5m 2 /day; S*=0.00113 nature of the over-lying and lower-lying forformations in regards to the leakage to the main aquifer in the setting up the conceptual aquifer scheme, for which geophysical prospecting would be very helpful and effective (Nguyen Van Giang et al, 2014). The determination of the exact boundary condition kinds, boundary values and aquifer parameters values for the areas along the Red river as well as for the areas of boundary of the Pleistocene aquifer with the bed rock in the West and South-West areas of the Red river plain have a very important role in the of the natural groundwater resources and groundwater abstraction potential along with the recharge components, which would also have a significant role in the soil hydrodynamic mechanics in the engineering geological problems, including land subsidence due to groundwater abstraction.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

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

Huy¹,

Thanh²,

Lam

et al. 2017

TCCKHVTD

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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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Section: Discussion and Concluding Remarksmentioning

confidence: 99%