Groundwater flow in a transboundary fault-dominated aquifer and the importance of regional modeling: the case of the city of Querétaro, Mexico

2016 ◽  
Vol 24 (2) ◽  
pp. 373-393 ◽  
Author(s):  
J. J. Carrera-Hernández ◽  
D. Carreón-Freyre ◽  
M. Cerca-Martínez ◽  
G. Levresse
Keyword(s):  
Groundwater Flow ◽  
Regional Modeling ◽  
The City

scholarly journals Modeling Surface Runoff, Groundwater Flow and their Interaction with PCSWMM and MODFLOW - for the City of Rostov the Great, Russia

2004 ◽  
Author(s):  
Gilles Rivard ◽  
◽  
Richard Frenette ◽  
Mikhail Bolgov ◽  
Serguey Pozgniakov ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Surface Runoff ◽  
The City

Numerical Analysis of the Impact of Intensive Underground Structures on Groundwater Flow in Guangzhou (Canton), China

2014 ◽  
Vol 501-504 ◽  
pp. 1832-1845
Author(s):  
Guanyong Luo ◽  
Hong Cao ◽  
Hong Pan
Keyword(s):  
Groundwater Flow ◽  
Underground Structure ◽  
Hydraulic Head ◽  
Underground Structures ◽  
Groundwater Balance ◽  
Darcy Velocity ◽  
Groundwater Environment ◽  
Structure Density ◽  
The Impact ◽  
The City

The soil over the bedrock in the city of Guangzhou is thin, with a depth of only about 11 m. Under such conditions, excessive exploitation of the underground space is very likely to affect the groundwater environment. In this paper, the impact of intensive underground structures, which act as barriers, on the groundwater flow in Guangzhou is investigated. The emphasis is on the impacts in terms of hydraulic head, Darcy velocity and groundwater balance. The study finds that: (1) Under the current underground structure density, the impact on the hydraulic head is small, and most of the change is in the range of ±0.5 m. (2) The Darcy velocity appears to be more susceptible to being affected by the structures. (3) The barrier effect of the intensive structures increases the overflow at the foot of the hills and reduces the transmissivity of the aquifer.

Investigation of Groundwater Flow Direction in Port Harcourt, Nigeria

2020 ◽  
Vol 38 (12A) ◽  
pp. 1744-1750
Author(s):  
Francis J. OGBOZIGE ◽  
Michael A. Toko
Keyword(s):  
Groundwater Flow ◽  
Water Level ◽  
Flow Direction ◽  
Surface Elevation ◽  
Municipal Water Supply ◽  
Septic Tanks ◽  
Port Harcourt ◽  
Static Water ◽  
The City ◽  
Static Water Level

The lack of reliable municipal water supply in the city of Port Harcourt has led to indiscriminate drilling of boreholes by the residents however, the direction of groundwater flow within the entire city has not been established. Hence, the research investigated the flow direction of groundwater in the study area in order to understand the best location for siting septic tanks and dumpsites with respect to the position of the existing or proposed borehole. This was achieved by determining the hydraulic heads (Hh) of twenty boreholes evenly distributed within the city by subtracting the static water level (SWL) from the corresponding earth surface elevation (E) with the use of a GPS and dipmeter. Results revealed that the hydraulic heads ranged from 0.14 – 23.16m while the surface elevation and static water level lies between 1.93 – 39.33m and 1.79 – 17.27m respectively. The contour map of the hydraulic heads indicated that the groundwater flows towards the southern and south-western directions hence, the residents were advised to take into cognizance when sitting dumpsites, landfills, and septic tanks with respect to proposed or existing boreholes.

scholarly journals City-scale groundwater flow and heat transport modeling in the Milan Metropolitan Area

2020 ◽  
Author(s):  
Alberto Previati ◽  
Giovanni Battista Crosta ◽  
Jannis Epting
Keyword(s):  
Groundwater Flow ◽  
Heat Transport ◽  
Metropolitan Area ◽  
Thermal Regime ◽  
Rural Areas ◽  
Anthropogenic Heat ◽  
Heat Sources ◽  
Thermal Potential ◽  
The Impact ◽  
The City

<p>Aquifers beneath big cities are considered a very important resource from an energy and water supply point of view and are increasingly exploited by means of groundwater extraction wells as well as by shallow open- and closed-loop geothermal systems. Moreover, the shallow subsurface of densely populated cities is increasingly hosting underground infrastructures such as tunnels and building foundations. These activities lead to thermal pollution of the shallow urban underground. This phenomenon has already been documented (urban heat island effect) in many cities worldwide with higher ground/groundwater temperatures in the city centers with respect to surrounding rural areas. The local thermal impact of various underground activities has been studied with analytical and local-scale numerical modeling. However, the resulting groundwater thermal regime at the city-scale is yet mostly unexplored.</p><p>In this work the effects of anthropogenic heat sources and subsurface infrastructures in the Milan metropolitan area is presented. To this aim a groundwater head/temperature monitoring network was established in 2016. Groundwater temperatures in the city center are up to 3°C higher with respect to less urbanized areas. A correlation between the urban density and the groundwater thermal regime was observed. In order to evaluate the spatial variability of the groundwater temperatures, a detailed analysis based on a 3D FEM groundwater flow and heat transport numerical model was carried out by means of the commercial code FeFlow. First, the variability of hydraulic and thermal properties as from borehole logs was spatialized into the model by means of 3D geostatistical techniques to account for aquifer heterogeneities. Complex thermal boundary conditions were assigned to the model including the effects of different land cover/sealing materials, building foundations, tunnels, shallow geothermal wells and the canal network. The thermal transport model was calibrated against high-resolution time-lapse groundwater temperature profiles and continuous measurements at fixed depth.</p><p>The modeling of the current thermal regime of the shallow aquifers was essential to understand the hydrogeological and thermal processes that are relevant at the city scale. The numerical results are a valuable tool to assess the impact of specific heat sources as well as of surface/subsurface infrastructures on the overall thermal regime and to test the long-term thermal potential of ground/groundwater heat exchangers under possible urban development scenarios. Thereby, the proposed approach can support the sustainable development of subsurface infrastructures at the city-scale and the management and assessment of the thermal potential of low enthalpy geothermal resources.</p>

scholarly journals Groundwater flow modelling of main groundwater reservoirs in the Gdańsk region, Poland

Geologos ◽  
2018 ◽  
Vol 24 (3) ◽  
pp. 217-224
Author(s):  
Zbigniew Kordalski ◽  
Andrzej Sadurski
Keyword(s):  
Groundwater Flow ◽  
Groundwater Resources ◽  
Border Region ◽  
Flow Simulations ◽  
Delta Plain ◽  
Flow Modelling ◽  
Vistula River ◽  
Groundwater Flow Modelling ◽  
Groundwater Reservoir ◽  
The City

Abstract During the last nine years, the 133 main groundwater reservoirs in Poland (MGR) have been documented; these were published last year. Some of these are situated in the coastal zone of the southern Baltic Sea. MGR numbers 111 and 112 are in the Gdańsk area and are discussed in the present paper. The study area is situated on the border region of the moraine plateau of the Cashubian Lakeland, the western part of the Vistula River delta plain and the Bay of Gdańsk. The area of the main groundwater reservoir in no. 112 is developed in Quaternary strata and referred to as Żuławy Gdańskie; it comprises predominantly the city of Gdańsk and slightly exceeds 100 km2. There is also a Cretaceous aquifer, rich in groundwater resources, which is named MGR no. 111, beneath the Quaternary reservoir mentioned above. The area studied and modelled totalled 364 km2, on account of the hydraulic connection between these aquifers. Methods of hydrogeological research, groundwater flow simulations, resources calculation are outlined in the present paper.

Water quality as an indicator of hydrogeological conditions: a case study of the Belgrade Groundwater Source (Sava/Danube confluence area)

2012 ◽  
Vol 65 (12) ◽  
pp. 2265-2271
Author(s):  
P. Papić ◽  
M. Pušić ◽  
M. Todorović
Keyword(s):  
Groundwater Flow ◽  
Groundwater Quality ◽  
Thick Layer ◽  
Alluvial Aquifer ◽  
Groundwater Source ◽  
The City ◽  
Initial Results ◽  
The Sava River

The City of Belgrade receives most of its drinking water supply from the alluvial aquifer of the Sava River. The wells are radial, placed in the lower part of the aquifer, so they partly run below the Sava riverbed. However, the groundwater quality of the wells in one part of the source (near the confluence of the Sava and Danube rivers) is found to differ somewhat from the groundwater quality of the other wells. The finding gave rise to additional investigations. The results revealed the existence of a deeper, limestone aquifer which is isolated from upper alluvial sediments by a thick layer of clay in most of the terrain. The naturally potential hydraulic contact of the two aquifers was additionally maintained by well operation in this part of the source. According to multiple analyses of groundwater flow using a hydrodynamic mathematical model, a hydrogeological and hydraulic system of groundwater flow was defined. Although the wells are situated adjacent to the river, and some well laterals are below the riverbed, most of the groundwater that flows to the wells is partly from the wider zone of the alluvial aquifer, and partly from the deeper aquifer. The initial results of hydrochemical investigations also showed an unexpected, inverse oxic character of the groundwater in these two aquifers.

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