Calculation of groundwater head distribution with a close barrier during excavation dewatering in confined aquifer

Lyu, Hai‐Min; Shen, Shui‐Long; Wu, Ya‐Fen; Zhou, Annan

doi:10.1016/j.gsf.2020.08.002

Cited by 64 publications

(14 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lowering of the groundwater level can be triggered by intensive abstraction or the reduction of groundwater recharge [3]. Excessive pumping changes the groundwater flow from horizontal to vertical [29]. The decline of GWLs in Dhaka city has been expedited due to large-scale abstraction [1,30] and unplanned urbanization.…”

Section: Introductionmentioning

confidence: 99%

Impacts of Large-Scale Groundwater Exploitation Based on Long-Term Evolution of Hydraulic Heads in Dhaka City, Bangladesh

Islam

Camp

Hossain

et al. 2021

Water

View full text Add to dashboard Cite

Dhaka city has emerged as the fastest-growing megacity, having more than 20 million inhabitants, with a growth rate of 3.62%. Unplanned and rapid urbanization, coupled with exponential population growth, has significantly altered the groundwater dynamics in Dhaka city. This study concentrates on the evolution of long-term piezometric heads of the Upper Dupi Tila aquifer (UDA) and the Middle Dupi Tila aquifer (MDA) based on long-term hydrographs, piezometric maps and synthetic graphical overviews of piezometric trends. Due to over-exploitation, the piezometric level (PL) has declined deeper than −85 and −65 m PWD (Public Works Department reference datum) in UDA and MDA, respectively. The highest rate of decline was observed in the south-central to southeastern parts of the city both in UDA (4.0 m/year) and MDA (5.74 m/year). The results clearly show that the rates of decline in PL vary from 2.25 to 5.74 m/year in both aquifers of the city, and urban expansion has greatly affected the shape and extent of the depression cone over the past four decades. The magnitudes of the depression cones in both aquifers seem to pose a considerable threat to groundwater resources, indicating that the current exploitation is not sustainable at all.

show abstract

Section: Introductionmentioning

confidence: 99%

Impacts of Large-Scale Groundwater Exploitation Based on Long-Term Evolution of Hydraulic Heads in Dhaka City, Bangladesh

Islam

Camp

Hossain

et al. 2021

Water

View full text Add to dashboard Cite

show abstract

“… This dataset can be conveniently reused by other researchers as an additional part of a larger engineering dataset. The point cloud dataset including the geometry information is of benefit to the parameter optimization [6] , [7] , [8] , risk assessment [9] , [10] , [11] in the construction of tunnels. …”

Section: Value Of the Datamentioning

confidence: 99%

Data on point cloud scanning and ground radar of composite lining in jointly constructed tunnel

Zhang

2022

Data in Brief

View full text Add to dashboard Cite

“…Dilution, in turn, leads to the underestimation of the equilibration temperature and circulation depth. To estimate the degree of the thermal waters mixing with cold groundwater and surface water and to evaluate with more accuracy the reservoir temperature, the Si-enthalpy mixing model can be used (Figure 5) [25,26,[36][37][38][39][40][41][42][43][44].…”

Section: Estimation Of the Reservoir Temperaturementioning

confidence: 99%

Estimation of the Deep Geothermal Reservoir Temperature of the Thermal Waters of the Active Continental Margin (Okhotsk Sea Coast, Far East of Asia)

Bragin

Zippa

Челноков

et al. 2021

Water

View full text Add to dashboard Cite

Low-enthalpy thermal waters (30–70 °C) with nitrogen as a dominant associated gas are spread within the active continental margin of the Russian Far East (east and north of the Okhotsk Sea Coast) and traditionally are of great importance for recreation and balneology facilities. The thermal waters are chemically classified into three groups: (i) Na–HCO3(SO4) type, with low TDS (0.2 g/L) and lowest temperature (<50 °C) and high pH (9.1–9.3), (ii) Na–SO4 type with TDS (~1 g/L), highest temperature (70 °C) and weak alkaline pH (8.7) and (iii) Ca–Na–Cl type with high TDS (15 g/L), moderate T (59 °C) and neutral pH (7.5). The δ18O and δD values suggest that the thermal waters originate from meteoric water, and they are not isotopically fractionated. Silica and cation geothermometers and thermodynamic equilibrium calculations using the GeoT and PHREEQC programs indicate a reservoir temperature for the Na–HCO3(SO4) type thermal waters of 103–121 °C and for Na–SO4 and Ca–Na–Cl types of 136 and 153 °C, respectively. The evaluation of the mixing degree of the thermal water with cold groundwater shows that the equilibration temperature ranges between 148 and 153 °С. Estimated circulation depths for thermal manifestations range from 2.7 to 4.3 km and may be as great as 6 km.

show abstract

Calculation of groundwater head distribution with a close barrier during excavation dewatering in confined aquifer

Cited by 64 publications

References 32 publications

Impacts of Large-Scale Groundwater Exploitation Based on Long-Term Evolution of Hydraulic Heads in Dhaka City, Bangladesh

Impacts of Large-Scale Groundwater Exploitation Based on Long-Term Evolution of Hydraulic Heads in Dhaka City, Bangladesh

Data on point cloud scanning and ground radar of composite lining in jointly constructed tunnel

Estimation of the Deep Geothermal Reservoir Temperature of the Thermal Waters of the Active Continental Margin (Okhotsk Sea Coast, Far East of Asia)

Contact Info

Product

Resources

About