Using Visual MODFLOW Model to Assess the Efficiency of Subsurface Barrier Wall for Groundwater Flow Regulation and Reduction of Saline Intrution

2021 ◽  
Vol 10 (3) ◽  
Author(s):  
Nguyen Minh Khuyen ◽  
Doan Van Long ◽  
Nguyen Tien Bach ◽  
Tang Huu Dong ◽  
Bui Cong Du ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Flow Regulation ◽  
Visual Modflow ◽  
Subsurface Barrier ◽  
Barrier Wall

scholarly journals Effects of Baekje Weir Operation on the Stream–Aquifer Interaction in the Geum River Basin, South Korea

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2984
Author(s):  
Hyeonju Lee ◽  
Min-Ho Koo ◽  
Byong Wook Cho ◽  
Yong Hwa Oh ◽  
Yongje Kim ◽  
...  
Keyword(s):  
South Korea ◽  
Groundwater Flow ◽  
Groundwater Quality ◽  
Flow System ◽  
Natural Ecosystem ◽  
Visual Modflow ◽  
Ecosystem Recovery ◽  
Groundwater Use ◽  
Groundwater Flow System ◽  
The Impact

Hydraulic structures have a significant impact on riverine environment, leading to changes in stream–aquifer interactions. In South Korea, 16 weirs were constructed in four major rivers, in 2012, to secure sufficient water resources, and some weirs operated periodically for natural ecosystem recovery from 2017. The changed groundwater flow system due to weir operation affected the groundwater level and quality, which also affected groundwater use. In this study, we analyzed the changes in the groundwater flow system near the Geum River during the Baekje weir operation using Visual MODFLOW Classic. Groundwater data from 34 observational wells were evaluated to analyze the impact of weir operation on stream–aquifer interactions. Accordingly, the groundwater discharge rates increased from 0.23 to 0.45 cm/day following the decrease in river levels owing to weir opening, while the hydrological condition changed from gaining to losing streams following weir closure. The variation in groundwater flow affected the groundwater quality during weir operation, changing the groundwater temperature and electrical conductivity (EC). Our results suggest that stream–aquifer interactions are significantly affected by weir operation, consequently, these repeated phenomena could influence the groundwater quality and groundwater use.

Simulation of Groundwater Flow and Pollutant Transport for Alluvial Aquifer in Kampung Tekek, Tioman Island

2012 ◽  
Author(s):  
Norhan Abd. Rahman ◽  
Woei–Keong Kuan
Keyword(s):  
Groundwater Flow ◽  
Flow Simulation ◽  
Pollutant Transport ◽  
World Health Organisation ◽  
Peninsular Malaysia ◽  
Tourism Industry ◽  
World Health ◽  
Visual Modflow ◽  
Transport Modelling ◽  
Potential Contaminant

Pulau Tioman terletak di pantai timur Semenanjung Malaysia. Akibat pembangunan yang pesat dalam industri pelancongan, permintaan terhadap bekalan air dijangka akan meningkat di pulau ini. Daripada kajian yang telah dijalankan sebelumnya, didapati airbumi merupakan sumber air yang berpotensi. Satu perisian model 3–dimensi (Visual MODFLOW) telah digunakan untuk menghasilkan model aliran airbumi dan pengangkutan bahan pencemar di Kampung Tekek dengan tujuan meramal simpanan airbumi dan penyebaran bahan pencemar, iaitu nitrat, semasa pengepaman. Daripada keputusan simulasi aliran airbumi yang diperolehi, pengepaman akuifer di Kampung Tekek dapat mencapai pada kadar 4000 m3/hari. Kajian model bahan pencemar menunjukkan kepekatan bahan pencemar nitrat yang tercatat di telaga pam didapati agak rendah dan memenuhi piawaian air minuman World Health Organisation (WHO). Kata kunci: Aliran airbumi, bahan pencemar, model numerik, Visual MODFLOW, pulau Tioman Island is situated in the east coast of Peninsular Malaysia. With rapid growth in tourism industry, the demand for water supply is expected to increase in this island. From previous studies, groundwater was found to be a potential source of water. A 3–dimensional numerical modelling software (Visual MODFLOW) is used to simulate the groundwater flow and pollutant transport of the aquifer in Kampung Tekek, for the prediction of available yield of groundwater, and also for studying the migration of potential contaminant source, i.e. nitrate, due to the withdrawal. The groundwater flow simulation results showed that the aquifer is capable of pumping 4000 m3/day. Results of pollutant transport modelling showed that the estimated concentration of nitrate in the pump well is generally low and complies with World Health Organisation (WHO) standard for drinking water. Key words: Groundwater flow, pollutant transport, numerical model, Visual MODFLOW, island

scholarly journals GROUNDWATER CONCEPTUAL MODEL FOR PADDY IRRIGATION

2015 ◽  
Vol 78 (1-2) ◽  
Author(s):  
Ahmad Fikri Abdullah ◽  
Wan Amirul Wan Mustapa
Keyword(s):  
Groundwater Flow ◽  
Conceptual Model ◽  
Root Zone ◽  
Groundwater Resources ◽  
Visual Modflow ◽  
Alternative Source ◽  
Aquifer Storage ◽  
Paddy Irrigation ◽  
Rice Irrigation ◽  
Current Water

Hydrological modelling is representative of current, past or future hydrologic balance. It has been used widely in water-related problem such as drought, flood, water contamination and irrigation. Crops irrigation requires a lot of water to irrigate the root zone layer especially for paddy crops. With the current issues of water such as drought and pollution, an alternative source is needed to overcome the problem of water scarcity.  Generally Malaysia depends on the surface water to irrigate the crops with no aided of groundwater. This study focuses on the availability of groundwater resources to irrigate the paddy crops. Hence, a conceptual model of groundwater flow was developed to shows the current situation of the groundwater flow at the study area. Several models were developed to see if groundwater can be extracted using wells and be used as an alternative source for irrigation. The study area is located at Sawah Sempadan, which is one of Malaysia’s greeneries areas under Tanjung Karang Rice Irrigation Scheme (TAKRIS). The conceptual model is built by using Visual MODFLOW 4.2. The conceptual model shows the current water balance, water table elevation and equipotential head in the study area. Simulations with pump wells have been done to shows the availability of groundwater sources for paddy irrigation. The result shows that groundwater flows from area of higher elevation towards the lower elevated area. It is also shows that groundwater extraction could not be too excessive as it may dry up the aquifer storage.

Study of groundwater using visual MODFLOW in the Manas River Basin, China

Water Policy ◽  
2016 ◽  
Vol 18 (5) ◽  
pp. 1139-1154 ◽  
Author(s):  
Xiaolong Li ◽  
Xinlin He ◽  
Guang Yang ◽  
Li Zhao ◽  
Si Chen ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Flow Model ◽  
Three Dimensional ◽  
Transient State ◽  
Normal Operation ◽  
Groundwater Flow Model ◽  
Visual Modflow ◽  
Balance Study ◽  
Groundwater Levels ◽  
Groundwater Drawdown

For effective groundwater management of a basin, it is essential that a careful water balance study be carried out. A three-dimensional transient-state finite difference groundwater flow model is used to quantify the groundwater fluxes and analyze the dynamic changes of groundwater level. After monitoring groundwater levels for 43 typical observation wells through a simulation study of the groundwater flow model with a depth of 300 m, results reveal that the study area has a lateral recharge of about 3.57 × 109 m3, which makes up 79.08% of the total recharge; total evaporation is about 1.81 × 108 m3, which makes up 3.77% of the total discharge. The balance of groundwater is negative, with a recharge and discharge difference of −2.81 × 108 m3. The correlation coefficient between the observed head and the calculated head for the simulation period is greater than 0.81, indicating the simulation results are satisfactory. The maximum groundwater drawdown is 26.59 m and the rate of the groundwater drawdown is 0.15 m/d during normal operation of the pumping well.

scholarly journals Envisaging the Sustainability of an Aquifer by Developing Groundwater Flow Model for a Part of ChoutuppalMandal, Nalgonda District, Telangana, India

2020 ◽  
Vol 19 (1) ◽  
pp. 222-233
Author(s):  
P. K. Neupane ◽  
N. C. Mondal ◽  
A. Manglik
Keyword(s):  
Drinking Water ◽  
Groundwater Flow ◽  
Flow Equation ◽  
Visual Modflow ◽  
Fractured Aquifer ◽  
Pumping Rate ◽  
Groundwater Levels ◽  
The North ◽  
Weathered Layer ◽  
Nalgonda District

 Recurring droughts and increased exploitation of groundwater to meet the growing water needs have resulted in the decline of regional groundwater level and dry, weathered zone in a part of the Choutuppal Mandal, Nalgonda district, Telangana, India. A groundwater model has been developed using an inventory of 20 observation wells for future pumping schemes to evolve a classic interface (Build: 4.6.0.168) of available wells. The developed model has been reviewed using Visual MODFLOW, and a base map is prepared for the sub-surface structure. The area spreading about 0.43 km2is conceptualized as a two-layered model consisting of a weathered layer overlying a fractured aquifer. The model has been digitized into grids of 5m×5m in each layer. The integrated finite difference method has been utilized to discretize the groundwater flow equation and simulate groundwater flow with the help of calculated parameters along with the boundary conditions and acting stresses. Results show that the computed groundwater levels are in good agreement with the observed heads, and groundwater is flowing from the South to the North direction. The estimated velocities vary from 0.01 to 1.95 m/d. The optimum pumping schemes have also been simulated up to the year 2022. It has been observed that the maximum pumping rate should not go beyond 24m3/day. Since the drinking water demand(10-15m3/day) in the study site is below this limit, it can be inferred that the aquifer will sustain and provide enough drinking water.

scholarly journals Lateral groundwater flow and pond interactions during dry and wet years

SURG Journal ◽  
2017 ◽  
Vol 9 (1) ◽  
pp. 27-39
Author(s):  
Andrew Wicke ◽  
Thair Patros ◽  
Gary Parkin
Keyword(s):  
Surface Water ◽  
Groundwater Flow ◽  
Flow Direction ◽  
Unconfined Aquifer ◽  
Hydrologic Cycle ◽  
Future Climate Change ◽  
Visual Modflow ◽  
Evaporative Demand ◽  
Monitoring Wells ◽  
Tightly Coupled

Groundwater and surface water are tightly coupled elements of the hydrologic cycle that have often been treated as separate entities. Future climate change modelling has predicted that hydrologic cycle changes, namely increasing drought frequency and flood-type events, are likely to occur. These events may directly impact the quality and quantity of both groundwater and surface water. Future water management policies must therefore be based on an understanding of how interactions between groundwater and surface water will change with a warming climate. The aim of this study was to model and analyze the lateral flow of groundwater and its interactions with a nearby pond in a shallow, unconsolidated, unconfined aquifer. Data were collected as part of a larger and ongoing study during the year 2012, a comparatively dry year, and 2013, a comparatively wet year. We first used ArcGIS and Visual MODFLOW Flex to create a conceptual model of the system, its soil layers, monitoring wells, and potential flow patterns. We then analyzed hydraulic head data, and calculated groundwater flow volumes using the Dupuit equation. We found that the groundwater flow direction reversed in the summer of 2012 and continued until the spring of 2013. Additonally, flow rate was greater in 2013 than 2012. The flow reversal was likely caused by higher evaporative demand during the summer months of 2012, drawing substantially more water from the pond than from the soil. The two-year timeframe was not long enough to determine whether this was a typical, yearly pattern, or was primarily due to the fact that 2012 was a particularly dry year.

Application of Visual MODFLOW to the Analysis of Boundary Conditions for a Phreatic Porous Aquifer Using Limited Available Information: A Case Study

2021 ◽  
Vol 44 ◽  
Author(s):  
Milena Stefany Lage Almeida ◽  
JOSÉ AUGUSTO COSTA GONÇALVES
Keyword(s):  
Boundary Conditions ◽  
Groundwater Flow ◽  
Root Mean Square ◽  
Flow Behavior ◽  
Groundwater Resources ◽  
Absolute Error ◽  
Mean Square ◽  
Visual Modflow ◽  
Porous Aquifer ◽  
The Mean

The increasing water demand, especially in developing regions, continuously puts pressure on groundwater resources both quantitatively and qualitatively. Hydrogeological modeling is a tool used in planning and management of groundwater resources. The factors that interfere in groundwater flow dynamics can be determined by developing a conceptual model and they can be validated via a numerical model. The objective of the manuscript is the hydrogeological groundwater flow modeling of the phreatic porous aquifer of the Ribeirão Candidópolis catchment in the Itabira municipality, State of Minas Gerais (Brazil). The software used in this study is GMS: MODFLOW, which enabled a steady state flow regime modeling by means of the Finite Difference Method (FDM) and the parameters calibration from a semi-transient approach. To assess the performance of the model, the Mean Error (ME), the Mean Absolute Error (MAE), and the Root Mean Square Error (RMSE) were calculated. The results proved to be compatible with the values observed in the field. After several adjustments of the boundary conditions, a Normalized Root Mean Square (NRMS) of 9.648% and a correlation coefficient of 0.993 were obtained. Despite the economic importance of the study area, studies made available on groundwater flow behavior are rare. The results obtained via modeling are in accordance with the data observed in the field and consequently our model can be used in the study of water level changes.

scholarly journals Solutions for groundwater flow with sloping stream boundary: analytical, numerical and experimental models

2017 ◽  
Vol 49 (4) ◽  
pp. 1120-1130 ◽  
Author(s):  
Uğur Boyraz ◽  
Cevza Melek Kazezyılmaz-Alhan
Keyword(s):  
Surface Water ◽  
Groundwater Flow ◽  
Laboratory Experiments ◽  
Groundwater Resources ◽  
Experimental Models ◽  
Flow Equation ◽  
Visual Modflow ◽  
Aquifer System ◽  
Aquifer Characteristics ◽  
Made In

Abstract Protecting groundwater resources plays an important role in watershed management. For this purpose, studies on groundwater flow dynamics incorporating surface water–groundwater interactions have been conducted including analytical, numerical, and experimental models. In this research, a stream–aquifer system was considered to understand the physical behavior of surface water–groundwater interactions. Interactions in a stream–aquifer system were incorporated into the mathematical modeling by defining the stream head as a boundary condition for the groundwater flow equation. This boundary was chosen as a sloping stream boundary, which is an approach in representing the natural conditions of the stream and may be used to define continuous interactions between stream and aquifer. A semi-analytical solution for transient 2D groundwater flow was developed for the considered problem. Isotropic, homogeneous, and finite aquifer assumptions were made in order to define the aquifer characteristics. Then, a series of laboratory experiments was conducted to simulate this stream–aquifer system. Finally, a numerical model was developed by using Visual MODFLOW to verify analytical and experimental results. Numerical results matched with both analytical solutions and the experimental observations.

scholarly journals Changes in Stream–Aquifer Interactions Due to Gate Opening of the Juksan Weir in Korea

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1639
Author(s):  
Hyeonju Lee ◽  
Min-Ho Koo ◽  
Juhyeon Lee ◽  
Kangjoo Kim
Keyword(s):  
Groundwater Flow ◽  
Groundwater Quality ◽  
River Restoration ◽  
River Flow ◽  
Three Dimensional ◽  
Visual Modflow ◽  
Gate Opening ◽  
Water Gate ◽  
Agricultural Areas

The Juksan weir, installed in the Yeongsan river in South Korea from 2010 to 2012, has secured sustainable water resources and helped control flooding. However, low river flow velocities due to the weir have deteriorated the quality of the river water. For natural river restoration, the water gate was opened in 2017. In this study, the three-dimensional finite difference model Visual MODFLOW was used to analyze the effects of gate opening on stream–aquifer interactions. A conceptual model was developed to simulate the stream–aquifer dynamics caused by the operation of the water gate at the Juksan weir. Groundwater data were also analyzed to determine the impacts of weir operations on groundwater quality. Our results indicate that a lower river level due to the weir opening changed the groundwater flow, which then affected the water balance. The change in groundwater flow increased the variability of the groundwater quality which had homogenized because of induced recharge after the construction of the weir. This could affect groundwater use in agricultural areas near the weir. Therefore, further groundwater monitoring and hydrodynamic analyses are required to anticipate and address any potential issues.

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