scholarly journals GMS-MODFLOW application in the investigation of groundwater potential in Concepcion, Tarlac, Philippines

2021 ◽  
Vol 958 (1) ◽  
pp. 012005
Author(s):  
L C Quitaneg
Keyword(s):  
Groundwater Potential ◽  
Significant Decline ◽  
Groundwater Model ◽  
Groundwater Abstraction ◽  
Temporal Variables ◽  
Groundwater Supply ◽  
Freshwater Source ◽  
Simulation Results ◽  
Limited Surface ◽  
Demand Projection

Abstract This study used GMS-Modflow to investigate the ten-year groundwater potential in Concepcion, Tarlac. This region in Central Luzon, Philippines, with limited surface water, depends on groundwater as its primary freshwater source. The water demand projection estimated an increase of 38.5% from 2020 to 2030; hence, higher groundwater abstraction is perceived in the next ten years. To deviate from the risk associated with reliance on groundwater, this study, through GMS-MODFLOW, developed a groundwater model to mimic the aquifer’s current condition and investigated its behavior in response to future spatial and temporal variables. The simulation results generally showed a sustainable groundwater supply in Concepcion, Tarlac, for the next ten years, with no significant decline in hydraulic heads.

scholarly journals Using Geo-electric Techniques for Vulnerability and Groundwater Potential Analysis of Aquifers in Nnewi, South Eastern Nigeria

2021 ◽  
Vol 30 (1) ◽  
pp. 43-52
Author(s):  
Kenechukwu A. Ifeanyichukwu ◽  
Elizabeth Okeyeh ◽  
Okechukwu E. Agbasi ◽  
Onwe I. Moses ◽  
Ogechukwu Ben-Owope
Keyword(s):  
Hydraulic Conductivity ◽  
Groundwater Potential ◽  
Hydraulic Parameters ◽  
Protective Capacity ◽  
Anambra State ◽  
Transverse Resistance ◽  
Longitudinal Conductivity ◽  
Groundwater Supply ◽  
Electrical Sounding ◽  
Apparent Resistance

In Nnewi, Anambra State Nigeria, twenty vertical electrical sounding (VES) were performed to delineate vulnerability and transmissivity of identified aquifer within the study area. Hydraulic parameters (transverse resistance, longitudinal conductivity, hydraulic conductivity and transmissivity) were delineated from geoelectrical parameters (depth, thickness, and apparent resistance). The geo- parameters of the aquifer: apparent resistance from 1000.590 to 1914.480, thickness from 42.850 – 66.490 m and 65.530 to 100.400 m of depth. The estimated hydraulic parameters of the aquifers are transverse resistance 54264.383 - 104568.898 Ωm, longitudinal conductance 0.029 – 0.062 mho, hydraulic conductivity 0.664 – 2.015 m/day and transmis- sivity between 4.167 and 13.963 m2/day. All aquifers have poor protective capacity, 40 percent of the aquifers have low classification with smaller withdrawal potential for local groundwater supply, while 60 percent of the delineated aquifer has intermediate classification and withdrawal potential for local groundwater supply. Due to its groundwater supply potential and protective capacity, the eastern part of the study area has stronger groundwater potential.

scholarly journals Comparing Groundwater Storage Changes in Two Main Grain Producing Areas in China: Implications for Sustainable Agricultural Water Resources Management

2020 ◽  
Vol 12 (13) ◽  
pp. 2151 ◽  
Author(s):  
Longqun Zheng ◽  
Yun Pan ◽  
Huili Gong ◽  
Zhiyong Huang ◽  
Chong Zhang
Keyword(s):  
Food Production ◽  
Groundwater Abstraction ◽  
Groundwater Storage ◽  
The North ◽  
Grace Data ◽  
Groundwater Supply ◽  
Agricultural Water Resources ◽  
Gravity Recovery ◽  
Sown Area ◽  
Additional Area

Balancing groundwater supply and food production is challenging, especially in large regions where there is often insufficient information on the groundwater budget, such as in the North China Plain (NCP) and the Northeast China Plain (NECP), which are major food producing areas in China. This study aimed to understand this process in a simple but efficient way by using Gravity Recovery and Climate Experiment (GRACE) data, and it focused on historical and projected groundwater storage (GWS) changes in response to changes in grain-sown areas. The results showed that during 2003–2016, the GWS was depleted in the NCP at a rate of −17.2 ± 0.8 mm/yr despite a decrease in groundwater abstraction along with an increase in food production and a stable sown area, while in the NECP, the GWS increased by 2.3 ± 0.7 mm/yr and the groundwater abstraction, food production and the sown area also increased. The scenario simulation using GRACE-derived GWS anomalies during 2003–2016 as the baseline showed that the GWS changes in the NCP can be balanced (i.e., no decreasing trend in storage) by reducing the area of winter wheat and maize by 1.31 × 106 ha and 3.21 × 106 ha, respectively, or by reducing both by 0.93 × 106 ha. In the NECP, the groundwater can sustain an additional area of 0.62 × 106 ha of maize without a decrease in storage. The results also revealed that the current groundwater management policies cannot facilitate the recovery of the GWS in the NCP unless the sown ratio of drought-resistance wheat is increased from 90% to 95%. This study highlights the effectiveness of using GRACE to understanding the nexus between groundwater supply and food production at large scales.

What drives the decline in groundwater table? A story of Edendale in New Zealand

2020 ◽  
Author(s):  
Jing Yang ◽  
Channa Rajanayaka ◽  
Lawrence Kees
Keyword(s):  
New Zealand ◽  
Statistical Method ◽  
Land Surface ◽  
Water Allocation ◽  
Hydrologic Model ◽  
Groundwater Table ◽  
Groundwater Model ◽  
Groundwater Abstraction ◽  
The Past ◽  
Physically Based

<p>The Edendale terrace aquifer in Southland New Zealand has experienced a declining trend of groundwater table over the past two decades. Water abstraction has increased over this time and is associated with farming development, intensification and increased production of local industry. Coincident with an increase of groundwater abstraction is a decrease in annual precipitation. Current granted water allocation is ~55% of the allowable limit of 15% of land surface recharge. Determining the main driver of the declining groundwater table is a first step to improving the sustainability of water use in this area.</p><p>In this study, we combined a statistical method and physically based modelling method to analyse the main driving force. In the statistical method, the relationship between precipitation, groundwater abstract, and groundwater table over the past two decades have been analysed and the contributions from decreasing precipitation and increasing groundwater abstract were quantified. In the physically based method, a groundwater model (MODFLOW) was coupled with a hydrologic model (TopNet) to simulate the groundwater flow, and scenarios of groundwater abstract and precipitation were assessed using this coupled hydrologic model and groundwater model.</p><p>The modelling result above is used for sustainable water allocation management by the regional government, and this methodology can be used for groundwater management in other regions with declining groundwater table.</p>

scholarly journals Application of Groundwater Model to Groundwater Regulation in Cangzhou Area

2019 ◽  
Vol 79 ◽  
pp. 03014 ◽  
Author(s):  
Juyan Zhu ◽  
Yunlong Wang ◽  
Haipeng Guo ◽  
Xisheng Zang ◽  
Tongchun Qin
Keyword(s):  
Water Levels ◽  
Groundwater Model ◽  
Geological Environment ◽  
Groundwater Extraction ◽  
Groundwater Abstraction ◽  
Groundwater Exploitation ◽  
Development And Utilization ◽  
Extraction Scheme ◽  
Groundwater Numerical Model ◽  
The Impact

The development and utilization of groundwater in Cangzhou area has led to a series of environmental and geological problems such as groundwater-level declines and land subsidence. In order to alleviate the impact of groundwater abstraction on geological environment, a calibrated, transient groundwater numerical model of the Cangzhou area was developed using Processing Modflow. Then four kinds of groundwater exploitation schemes were designed and the groundwater flow fields for different schemes in the next 50 years were simulated and predicted. By comparing and analyzing the variation of the water levels in the mining layers and the variation of groundwater storage, the optimal groundwater extraction scheme was determined.

scholarly journals Site Characterization for Construction Purposes at FUNAAB using Geophysical and Geotechnical Methods

2018 ◽  
Vol 65 (2) ◽  
pp. 89-102
Author(s):  
A.A. Alabi ◽  
A.O. Adewale ◽  
J.O. Coker ◽  
O.A. Ogunkoya
Keyword(s):  
Groundwater Potential ◽  
Liquid Limit ◽  
Deep Foundations ◽  
Groundwater Abstraction ◽  
Surface Layers ◽  
Atterberg Limit ◽  
Surface Information ◽  
Limit Test ◽  
Electrical Sounding ◽  
High Plastic

AbstractGeophysical and geotechnical techniques were used to investigate the sub-surface information of a proposed site for a hostel construction at Federal University of Agriculture, Abeokuta. Ten vertical electrical sounding (VES) stations were adopted. Typical sounding curves obtained include the HA, KH, AKH and KQH types, of which the AKH-type consists of 40% of the survey points, and a maximum of five geo-electric sub-surface layers were delineated. Laboratory analyses were performed to investigate particle size distribution, Atterberg limit, compaction limit, California bearing ratio (CBR) and specific gravity. The CBR revealed that all soil samples, except L4, are mechanically stable and have high load-bearing capacity. The Atterberg limit test and the geo-electric section showed that the second layer of VES 4 is composed of sandy clay with high plastic index and low liquid limit, which may pose a threat to the foundation of any engineering structure. VES locations 5, 6 and 8 were identified as high groundwater potential zones suitable for optimum groundwater abstraction. The study area is suitable for both shallow and deep foundations, however VES 4 and VES 5 require reinforcement.

scholarly journals Evaluation of lithostratigraphic units and groundwater potential using the resolution capacities of two different electrical tomographic electrodes at dual-spacing

2021 ◽  
Vol 51 (4) ◽  
pp. 295-320
Author(s):  
Adedibu Sunny AKINGBOYE ◽  
Andy Anderson BERY
Keyword(s):  
Stainless Steel ◽  
Groundwater Potential ◽  
Silty Sand ◽  
Electrode Spacing ◽  
Groundwater Abstraction ◽  
Copper Electrodes ◽  
Lithostratigraphic Units ◽  
Data Points ◽  
The University ◽  
Relative Differences

The selection of a choice electrode is pertinent to attenuating noise and improving geophysical tomographic inversion results. Besides, the detailed understanding of the geodynamic condition of subsurface formation is crucial to sustainable potable groundwater abstraction. Hence, the subsurface lithostratigraphic units and groundwater potential of two sites (i.e., Site 1 and Site 2) within the Universiti Sains Malaysia were evaluated using borehole-constrained electrical resistivity tomography (ERT) and induced polarisation (IP) tomography. Both methods employed the resolution capacities of stainless-steel and copper electrodes at dual-spacing. The ERT and IP field data and inversion results for copper electrodes were generally robust due to the generated higher positive data points and lower RMS errors, percentage relative differences, and mean absolute percentage errors (MAPE) than the stainless-steel electrodes, especially at Site 1 with a profile length of 200 m and an electrode spacing of 5 m. However, both electrodes tend to produce inversion models with almost the same parameters at Site 2, using half the profile length and electrode spacing of Site 1, i.e., 100 m and 2.5 m, respectively. Thus, the sensitivities and resolution capacities of the tomographic electrodes are heavily influenced by electrode spacing, profile length, amount of injected current, and depth of investigation. The borehole lithostratigraphic units, typically sandy silt, sand, and silty sand, have good correlations with the ERT and IP inversion results. The variability in observed resistivity and chargeability values were due to heterogeneous weathered materials and saturating water fills within the fractured and deeply-weathered granitic bedrock, with <200 Ωm and a chargeability of >1.8 msec. The models' median depth of >40 m mapped for the weathered and/or fractured sections was suggestive of high groundwater-yielding capacity in boreholes to sustain a part of the university community. 

scholarly journals Role of groundwater in the disaster preparedness plan- a case study of Kathmandu valley

2016 ◽  
Vol 50 (1) ◽  
pp. 55-58
Author(s):  
Suresh Das Shrestha ◽  
Sudan Bikash Maharjan
Keyword(s):  
Disaster Preparedness ◽  
Internal Displacement ◽  
Kathmandu Valley ◽  
Urban Water Supply ◽  
Groundwater Abstraction ◽  
Preparedness Plan ◽  
Groundwater Supply ◽  
Post Disaster

 Groundwater supply is an essential component in any disaster preparedness plan for the Kathmandu valley. Currently, groundwater supply contributes about 40% of the total urban water supply in the Kathmandu valley. In the event of natural disasters like earthquakes, groundwater may be the only water resource available. Considering the existing conditions and the facilities available at the abstraction points, however, reliability of this resource being extracted and put into use in the post disaster period however needs some serious planning and preparedness. Currently though large number of groundwater abstraction points are available in the vicinity of the the proposed Internal Displacement Person (IDP) sites, most of the sites do not have any preparedness plan in case of disaster.

scholarly journals Garden irrigation as household end-use in the presence of supplementary groundwater supply

Water SA ◽  
2019 ◽  
Vol 45 (3 July) ◽  
Author(s):  
Bettina Elizabeth Meyer ◽  
Heinz Erasmus Jacobs
Keyword(s):  
Flow Rate ◽  
Water Source ◽  
Irrigation Event ◽  
Residential Areas ◽  
Groundwater Abstraction ◽  
Irrigation Frequency ◽  
Event Duration ◽  
Groundwater Supply ◽  
Residential Properties ◽  
End Use

Garden irrigation is a significant and variable household water end‑use, while groundwater abstraction may be a notable supplementary water source available in some serviced residential areas. Residential groundwater is abstracted by means of garden boreholes or well points and – in the study area – abstracted groundwater is typically used for garden irrigation. The volume irrigated per event is a function of event duration, frequency of application and flow rate, which in turn are dependent on numerous factors that vary by source – including water availability, pressure and price. The temperature variation of groundwater abstraction pipes at residential properties was recorded and analysed as part of this study in order to estimate values for three model inputs, namely, pumping event duration, irrigation frequency, and flow rate. This research incorporates a basic end‑use model for garden irrigation, with inputs derived from the case study in Cape Town, South Africa.  The model was subsequently used to stochastically evaluate garden irrigation. Over an 11-d period, 68 garden irrigation events were identified in the sample group of 10 residential properties. The average garden irrigation event duration was 2 h 16 min and the average daily garden irrigation event volume was 1.39 m3.

Review on Practices and State of the Art Methods on Delineation of Ground Water Potential Using GIS and Remote Sensing

2018 ◽  
pp. 7-20 ◽  
Author(s):  
Champak Babu Silwal ◽  
Dinesh Pathak
Keyword(s):  
Remote Sensing ◽  
Water Table ◽  
Secondary Data ◽  
Drainage Density ◽  
Groundwater Potential ◽  
Specific Yield ◽  
Bivariate Analysis ◽  
Groundwater Abstraction ◽  
Gis And Remote Sensing ◽  
Aquifer Characteristics

Due to global increase in human population, the groundwater has been extensively used to meet the water demand for domestic as well as agricultural purpose. The number of deep and shallow wells has increased exponentially. For these purpose the groundwater potential area has to be delineated so as to delineate the area for intervention for groundwater abstraction. The determination of groundwater potential with the aquifer characteristics is not always possible due to unavailability of secondary data and from financial aspect. The delineation of groundwater potential with the integration of GIS and Remote Sensing (RS) as well as with the aid of geophysical data could be an effective approach. Groundwater delineation in mountainous region uses different hydrogeologic parameters like rainfall, slope, elevation, drainage density, lineament density, lithology/geology, land use/land cover (LULC), soil, etc., whereas in case of alluvial basins, parameters like aquifer material, soil, LULC, water table, specific yield, storage coefficient, transmissivity, etc. are used. The assignment of weight for the factors and rank for their classes are important steps in the Groundwater Potential Mapping (GPM) using GIS overlay. The weights for the different parameters have to be assigned as per their role in groundwater occurrences. Different methods like Analytical Hierarchy Process (AHP), expert’s knowledge, probability weight approach,  bivariate analysis, etc. have been used for assigning weights and ranks and the predicted potential need to be validated. Generally in mountainous aquifer, spring inventory forms the basic data for the verification. In addition, the aquifer characteristics like water table, yield, transmissivity can be used for the validation in flat lands. This method of delineation of groundwater potential is found to be appropriate with acceptable accuracy. Globally, there is increasing trend in the use of GIS and Remote Sensing for the identification of groundwater potential in recent time. Bulletin of Department of Geology, vol. 20-21, 2018, pp: 7-20

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