A regional groundwater-flow model for sustainable groundwater-resource management in the south Asian megacity of Dhaka, Bangladesh

Islam, Bayzidul; Firoz, A. B. M.; Foglia, Laura; Marandi, Andres; Khan, Aamna; Schüth, Christoph; Ribbe, Lars

doi:10.1007/s10040-016-1526-4

Cited by 34 publications

(18 citation statements)

References 23 publications

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“…The ratio of Na + / (Cl − + SO 2− 4 ) is around 1 (Fig. 7b), demonstrating mirabilite (Na 2 SO 4 · 10H 2 O) dissolution (Na 2 SO 4 · 10H 2 O → 2Na + + SO 2− 4 ) is an additional strong possible process that could also be responsible for the excess of Na + compared to Cl − in groundwater (Jia et al, 2017). Groundwater in the basin with extremely high TDS concentration (more than 1 000 000 mg L −1 ) has very low ratios of Na + / Cl − (0.08-0.26) as a result of suspected reverse cation exchange (Na + +CaX 2 or MgX 2 (solid) → 2Na + +CaX 2 or MgX 2 (solid)) ( Fig.…”

Section: Mechanisms Controlling Hydrochemistrymentioning

confidence: 98%

Groundwater origin, flow regime and geochemical evolution in arid endorheic watersheds: a case study from the Qaidam Basin, northwestern China

Xiao

Shao

Frape

et al. 2018

Hydrol. Earth Syst. Sci.

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Groundwater origin, flow and geochemical evolution in the Golmud River watershed of the Qaidam Basin was assessed using hydrogeochemical, isotopic and numerical approaches. The stable isotopic results show groundwater in the basin originates from precipitation and meltwater in the mountainous areas of the Tibetan Plateau. Modern water was found in the alluvial fan and shallow aquifers of the loess plain. Deep confined groundwater was recharged by paleowater during the late Pleistocene and Holocene under a cold climate. Groundwater in the low-lying depression of the central basin is composed of paleobrines migrated from the western part of the basin due to tectonic uplift in the geological past. Groundwater chemistry is controlled by mineral dissolution (halite, gypsum, anhydrite, mirabilite), silicate weathering, cation exchange, evaporation and mineral precipitation (halite, gypsum, anhydrite, aragonite, calcite, dolomite) and varies from fresh to brine with the water types evolving from HCO 3 · Cl-Ca · Mg · Na to Cl-Na, Cl-K-Na and Cl-Mg type along the flow path. Groundwater flow patterns are closely related to stratigraphic control and lithological distribution. Three hierarchical groundwater flow systems, namely local, intermediate and regional, were identified using numerical modeling. The quantity of water discharge from these three systems accounts for approximately 83 %, 14 % and 3 %, respectively, of the total groundwater quantity of the watershed. This study can enhance the understanding of groundwater origin, circulation and evolution in the Qaidam Basin as well as other arid endorheic watersheds in northwestern China and elsewhere worldwide.

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Section: Mechanisms Controlling Hydrochemistrymentioning

confidence: 98%

Groundwater origin, flow regime and geochemical evolution in arid endorheic watersheds: a case study from the Qaidam Basin, northwestern China

Xiao

Shao

Frape

et al. 2018

Hydrol. Earth Syst. Sci.

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“…Dhaka is a major economic hub, that experiences the enormous pressure of urbanization and, it is expected to be the third largest city in the world by 2020 (Dewan & Yamaguchi, 2009). Due to rapid urbanization, the natural earth surfaces are being converted to impervious surfaces moreover, it seems that the study area is facing numerous ecological and environmental problems (Islam et al, 2017). The City is highly dependent on the sub-surface water resources where 87% of the supplied water come from the groundwater.…”

Section: Methodsmentioning

confidence: 99%

“…However, rapid urbanization has resulted in tremendous pressure on this freshwater source. The over-extraction has resulted to drop the groundwater level at an increasing rate (Hoque et al, 2007;Islam et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Precipitation and Groundwater Level Interaction in the Highly Urbanized Area and Its Periphery

Faridatul¹

2018

CUS

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Precipitation is the primary source of freshwater. The availability of water in an area is largely dependent on precipitation that is further distributed into various components such as aquifer recharge, evapotranspiration and surface runoff etc. Aquifer recharge is one of the significant sources of groundwater that is affected because of increasing the urban sealed areas. Urbanization brings numerous artificial changes by altering natural earth surfaces into impervious areas that result in reducing infiltration. The changes in the urban land covers modify the natural drainage system and affect the groundwater recharge systems. As precipitation is the major source of groundwater, it is important to evaluate its influence on the aquifer recharge. Thus, this study is conducted to explore the interaction between precipitation and groundwater level. A comparative analysis is performed between urban and suburban environments. The results show that both urban and suburban areas experience groundwater depletion but the rate of depletion is high in urban areas compared to its suburban. The results also demonstrate that during monsoon, the groundwater level changes in the urban periphery but the water level remains static in the urban areas. The urban areas include more sealed areas that prohibit direct recharge, therefore, in urban areas, no significant relationship is observed between precipitation and groundwater level. In contrary, the influence of precipitation on groundwater level is observed in the suburban area therefore, relatively a high correlation is observed.

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“…The GW level simulation values in the calibrated model are compared with the observed values ( Figure 3b). The simulation results show that the wat'er level fitting is relatively poor in the upper Yellow River alluvial fan area (the errors of red dots such as Q36 and Q37 are between 1.4 m and 1.9 m), their larger errors result from the larger hydraulic gradient of GW and more significant seasonal fluctuation of GW level in the area [56]. The fitting effect of the water level in the plain area is good, with an error of within 0.6 m, and the error is mainly due to the heterogeneity and anisotropy of the medium [57].…”

Section: Groundwater Flow Modelingmentioning

confidence: 96%

Interaction between Surface Water and Groundwater in Yinchuan Plain

Cai

Wang

Zhao

et al. 2020

Water

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The interaction of surface water (SW) and groundwater (GW) is becoming more and more complex under the effects of climate change and human activity. It is of great significance to fully understand the characteristics of regional SW–GW circulation to reveal the water circulation system and the effect of its evolution mechanism to improve the rational allocation of water resources, especially in arid and semi-arid areas. In this paper, Yinchuan Plain is selected as the study area, where the SW–GW interaction is intensive. Three typical profiles are selected to build two-dimensional hydrogeological structure models, using an integrated approach involving field investigation, numerical simulation, hydrogeochemistry and isotope analysis. The SW–GW transformation characteristics are analyzed with these models, showing that geological structure controls the SW–GW interaction in Yinchuan Plain. The SW–GW flow system presents a multi-level nested system including local, intermediate and regional flow systems. The runoff intensity and renewal rate of different flow systems are evidently different, motivating evolution of the hydro-chemical field; human activities (well mining, agricultural irrigation, ditch drainage, etc.) change the local water flow system with a certain impacting width and depth, resulting in a variation of the hydrological and hydro-chemical fields. This study presents the efficacy of an integrated approach combining numerical simulation, hydrogeochemistry and isotope data, as well as an analysis for the determination of GW-SW interactions in Yinchuan Plain.

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A regional groundwater-flow model for sustainable groundwater-resource management in the south Asian megacity of Dhaka, Bangladesh

Cited by 34 publications

References 23 publications

Groundwater origin, flow regime and geochemical evolution in arid endorheic watersheds: a case study from the Qaidam Basin, northwestern China

Groundwater origin, flow regime and geochemical evolution in arid endorheic watersheds: a case study from the Qaidam Basin, northwestern China

A Comparative Study on Precipitation and Groundwater Level Interaction in the Highly Urbanized Area and Its Periphery

Interaction between Surface Water and Groundwater in Yinchuan Plain

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