Aquifer system for potential groundwater resources in Hanoi, Vietnam

Abstract

Abstract:Predictions in Ungauged Basins (PUB) mainly focus on surface water, but there are much higher prediction uncertainties inherent in groundwater. Hanoi depends entirely on groundwater for its domestic water supply. However, the characteristics of the entire Hanoi aquifer system remain poorly understood due to the lack of available data. Recently, we were nominated to construct a hydrogeological database. Using the valuable data contained in this database, this paper comprehensively analyzed the best number of 240 boreholes including well logs and their hydrogeological parameters obtained from pumping tests for the first time in order to identify the entire Hanoi aquifer system and characterize the hydrogeological conditions for potential groundwater resources. Great efforts have been made to establish and analyze the hydrogeological maps, cross sections and the isopach maps of main aquifers' thickness and transmissibility. As for the results, we found that groundwater mainly exists in the topmost Holocene unconfined aquifer and the shallow Pleistocene confined aquifer (PCA), while cleft and karst water exists in the Neogene water bearing layer and the Mesozoic fractured zones. These aquifers are adequately, quantitatively characterized and evaluated from the viewpoint of potential groundwater resources. We found the PCA serving as the highest groundwater potential and the most important aquifer for the water supply. The findings are indispensable for further groundwater analyses contributing to ensuring the sustainable groundwater development not only in Hanoi but also in poorly gauged or ungauged neighboring basins.

Environmental Sustainability Assessment of Groundwater Resources in Hanoi, Vietnam by a Simple Ahp Approach

“…There have been a number of Hanoi-targeted studies regarding each aspect individually such as quantity, quality and environmental impacts. In terms of quantity, a number of our previous studies has comprehensively investigated groundwater potential resources 12) and level trends in Hanoi 11), 13) ; presented the current situation of groundwater abstraction from sustainability point of view 14) . In terms of quality, furthermore, we have studied about hydrogeochemical assessment of groundwater quality during dry and rainy seasons for the two main aquifers 15) ; clustered hydrogeochemical groundwater data comprising major ions to investigate the seasonal and spatial hydrogeochemical characteristics of groundwater in the Pleistocene confined aquifer of the Red River Delta 16) ; presented the prevalence of arsenic contamination in both two main aquifers 13) and its health effects on the community in this study area 17) .…”

“…Our previous study, we comprehensively analyzed the aquifer system for potential groundwater resources in Hanoi 12) . Hanoi's groundwater resources mainly exist in the topmost Holocene unconfined aquifer (HUA) and the shallow Pleistocene confined aquifer (PCA).…”

Sustainable Groundwater Management in the Arid Southwestern US: Coachella Valley, California

“…Use of the Mann-Kendall trend test for analysis of groundwater trends has historically been applied for water quality data (Broers and Grift 2004;Wahlin and Grimvall 2010) and only recently applied to groundwater elevations (Weber and Perry 2006;Panda et al 2007;Ghanbari and Bravo 2011;Bui et al 2012;Machiwal and Jha 2014). The use of nonparametric approaches are preferred for non-normally distributed data and avoids complications of correlated residuals in linear regression approaches, which could be corrected by various transformations akin to prewhitening, for example the Cochrane-Orcutt or Hildreth-Lu transformation (Johnston and DiNardo 1997).…”

“…Our evaluation uses nonparametric trend analyses to assess individual and regional groundwater behaviors given that nonparametric approaches are ideal for non-normally distributed data often encountered in hydrologic time series (Helsel and Hirsch 2002). Panda et al (2007) were the first to evaluate groundwater behaviors using nonparametric trend detection (Mann 1945;Kendall 1962;Helsel and Hirsch 2002;Weber and Perry 2006;Ghanbari and Bravo 2011;Bui et al 2012;Machiwal and Jha 2014). Our analysis extends beyond these previous studies to evaluate regional groundwater elevation trends while accounting for cross-correlation of groundwater elevations.…”

Decline in groundwater levels in Thang Long Industrial Park within the area of Northwest Hanoi, Vietnam

“…The thickness of Qh is estimated to be 10-15m and that of Qp is about 20-40m (Dan and Dzung, 2002;DGMV, 2005). Characteristic properties of these two in the Red River Delta have been discussed in detail (Bui et al, 2012;Giang et al, 2012;Jusseret et al, 2010;Hori et al, 2004).…”