scholarly journals Groundwater Flow Modeling in Chitwan Dun Valley (Between Narayani River and Lothar Khola), Nepal

2019 ◽  
Vol 24 (2) ◽  
pp. 30-38
Author(s):  
Rita Bhandari ◽  
Dinesh Pathak
Keyword(s):  
Numerical Model ◽  
Groundwater Flow ◽  
Groundwater Modeling ◽  
Flow Direction ◽  
Flow Modeling ◽  
Aquifer System ◽  
Flow Equations ◽  
Flow Models ◽  
Future Behavior ◽  
Fence Diagram

 Models are simplification of reality to investigate certain phenomena or to predict future behavior and always tries to generate scenario that is close to the real condition. Groundwater flow models are computer models generated through using established flow equations that simulate and predict aquifer conditions. The result of groundwater modeling is used for groundwater management and remediation. In the present study, hydrostratigraphic units were identified through interpreting the lithological logs of the drilled wells then fence diagram was prepared with three major aquifer horizons, namely unconfined, shallow confined and deep confined aquifers. In addition, hydrogeologic data were integrated to develop a conceptual hydrogeologic model of the aquifer system of the Chitwan Dun valley, which was the basis for the development of the numerical model. The aquifer system was modeled numerically using MODFLOW-2005 numerical modeling, which was further calibrated and an acceptable numerical model was obtained which showed different flow direction in each aquifer layer. The model was validated by comparing the observed and simulated heads. The result shows that in each of the aquifer layers, the general flow direction is towards west and south-west.

Nonlinear-regression groundwater flow modeling of a deep regional aquifer system

1986 ◽  
Vol 22 (13) ◽  
pp. 1759-1778 ◽  
Author(s):  
Richard L. Cooley ◽  
Leonard F. Konikow ◽  
Richard L. Naff
Keyword(s):  
Groundwater Flow ◽  
Nonlinear Regression ◽  
Flow Modeling ◽  
Groundwater Flow Modeling ◽  
Aquifer System ◽  
Regional Aquifer

scholarly journals The Significance of Groundwater Flow Modeling Study for Simulation of Opencast Mine Dewatering, Flooding, and the Environmental Impact

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 848 ◽  
Author(s):  
Jacek Szczepiński
Keyword(s):  
Environmental Impact ◽  
Groundwater Flow ◽  
Mine Drainage ◽  
Numerical Models ◽  
Open Pit ◽  
Climate Conditions ◽  
Aquifer System ◽  
Flow Models ◽  
Mine Dewatering ◽  
Cyclic Changes

Simulations of open pit mines dewatering, their flooding, and environmental impact assessment are performed using groundwater flow models. They must take into consideration both regional groundwater conditions and the specificity of mine dewatering operations. This method has been used to a great extent in Polish opencast mines since the 1970s. However, the use of numerical models in mining hydrogeology has certain limitations resulting from existing uncertainties as to the assumed hydrogeological parameters and boundary conditions. They include shortcomings in the identification of hydrogeological conditions, cyclic changes of precipitation and evaporation, changes resulting from land management due to mining activity, changes in mining work schedules, and post-mining void flooding. Even though groundwater flow models used in mining hydrogeology have numerous limitations, they still provide the most comprehensive information concerning the mine dewatering and flooding processes and their influence on the environment. However, they will always require periodical verification based on new information on the actual response of the aquifer system to the mine drainage and the actual climate conditions, as well as up-to-date schedules of deposit extraction and mine closure.

scholarly journals A finite element method for environmental and pollutant transport prediction

2019 ◽  
pp. 122-129
Author(s):  
Victorita Radulescu
Keyword(s):  
Numerical Model ◽  
Groundwater Flow ◽  
Pollutant Transport ◽  
Mass Conservation ◽  
Ecological Impacts ◽  
Time Interval ◽  
Flow Equations ◽  
Sources Of Pollution ◽  
Water Quality Trends ◽  
Transport Prediction

In the last decades, significant researches were dedicated to model the water-quality trends, soil erosion and material losses, contaminant transport, and their ecological impacts. The present paper investigates theoretically and presents a numerical model with finite elements of the pollutant transport and diffusion in 2-D environmental flow. It is a general model based on the physical groundwater flow equations presented into a new approach, in quantity structure. The mathematical model is based on mass conservation, including the main flow of the fluid and existing pollutants. The fluid mass conservation includes the changes in the groundwater volume flow in a selected time interval and the appeared modifications in the aquifer characteristics due to the pollutant presence are used in the numerical model. Some supplementary considerations concerning mathematical modeling are briefly presented. This model can be used to simulate the groundwater behavior in different situations, with a concentrated source of the pollutant, or with 2 sources of pollution. In the present paper are simulated only the aquifers with mainly horizontal groundwater flow and with a relatively known aquifer’s structure. The model is tested for a landfill near the Dambovita River, to predict the groundwater contamination and the time variation of concentration. Finally, some conclusions and references are presented.

scholarly journals Predicted Climate Change Impact on Groundwater Flow for the Upper Zone of Iraqi Aquifers

2020 ◽  
Vol 55 (2) ◽  
Author(s):  
Thair Sharif Khayyun ◽  
Hasan Hadi Mahdi
Keyword(s):  
Climate Change ◽  
Groundwater Flow ◽  
Water Resource Management ◽  
Groundwater Modeling ◽  
Flow Direction ◽  
Flow Behavior ◽  
Climate Change Impacts ◽  
Groundwater Levels ◽  
Groundwater Movement ◽  
Aquifer Systems

A 3D groundwater steady-state flow conceptual model was built for all of Iraq using a MODFLOW package integrated with the Groundwater Modeling System to simulate the groundwater movement and flow direction for the upper zone of Iraq as well as to compute the water budget for all aquifer systems in Iraq. This model was run for seven scenarios of climate change conditions for the period of 2020–2050. A Representative Concentration Pathway model (RCP4.5) was used for the prediction of future rainfall over the next 31 years. The results showed that the decline in rainfall will be 6.247% due to climate change impacts. The decline in rainfall will cover two-thirds of the area of Iraq. Seven scenarios simulating groundwater flow behavior showed that decreased soil moisture content will significantly reduce groundwater recharge and increase runoff. A decline in groundwater levels by an average of 1.8–4.8 m will occur for the upper zone of Iraqi aquifers over the next 31 years. These results will help Iraqi decision-makers improve water resource management.

Modeling of Contaminant Transport and Groundwater Flow of Tamangapa Landfill in Makassar Indonesia

2014 ◽  
Vol 567 ◽  
pp. 92-97
Author(s):  
Hajrah ◽  
Ardy Arsyad ◽  
Achmad Zubair
Keyword(s):  
Groundwater Flow ◽  
Contaminant Transport ◽  
Flow Direction ◽  
Minimum Concentration ◽  
Flow Models ◽  
The North ◽  
Level Measurement ◽  
Groundwater Samples ◽  
Mn Concentration

This paper aims to analyze the groundwater flow direction of Tamangapa landfill and to predict the contaminant in the groundwater over the period of 20 years, accounted for the year of 2000 until 2020. To understand the natural condition of the landfill, geological and hydrogeological survey were undertaken, consisting of geological survey, geomorphology and geo-resistivity surveys. Hydrogeological survey comprises groundwater level measurement, chemical analysis of leachate and groundwater samples which were later used as input data for numerical model. Based on the result of groundwater flow models, the direction of groundwater is found to be flowing from the north to the south. The minimum concentration for manganese (Mn) is 1.519 mg/l and 2.701 mg/l for iron (Fe). Over the period of 2020, Fe concentration increases significantly, reaching the level of 56.427 mg/l, Mn concentration for 299.5594 mg/l. It can be suggested that the groundwater quality of Tamangapa landfill has already exceeded the standard for water quality, leading to potential severe impact to local people around the landfill. Keywords: Landfill, modflow, groundwater, leachate, contaminant.

Using Groundwater Flow Modelling for Investigation of Land Subsidence in the Konya Closed Basin (Turkey)

2018 ◽  
pp. 569-590
Author(s):  
Naciye Nur Özyurt ◽  
Pınar Avcı ◽  
Celal Serdar Bayarı
Keyword(s):  
Groundwater Flow ◽  
Land Subsidence ◽  
Sole Source ◽  
Central Anatolia ◽  
Flow Modeling ◽  
Groundwater Abstraction ◽  
Groundwater Flow Modeling ◽  
Aquifer System ◽  
Closed Basin ◽  
Groundwater Flow Modelling

Land subsidence which is defined as gradual settling or sudden collapse of Earth's surface, is a geohazard phenomenon that occurs worldwide. Land subsidence occurs in time mainly due to excessive groundwater abstraction. This problem occurs usually in semi-arid regions where the groundwater is the sole source of water. Eliminating the adverse effects of land subsidence requires careful observations on the temporal change of elevation coupled with groundwater flow modeling. In this study, numerical groundwater flow modeling technique is applied to a confined aquifer system in the Konya Subbasin of Konya Closed Basin (KCB), central Anatolia, Turkey. Groundwater head in the KCB has been declining with a rate of about 1m/year since early 1980s. Recent GPS observations reveal subsidence rates of 22 mm/year over the southern part of KCB. MODFLOW numerical groundwater flow model coupled with subsidence (SUB) package is used to simulate the effect of long term groundwater abstraction on the spatial variation of subsidence rates.

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