Groundwater pollution may occur due to human activities, industrial effluents, cemeteries, mine spoils, etc. This paper deals with one-dimensional mathematical modeling of solute transport in finite aquifers. The governing equation for solute transport by unsteady groundwater flow is solved analytically by the Laplace transform technique. Initially, the aquifer is subjected to the spatially dependent source concentration with zero-order production. One end of the aquifer receives the source concentration and is represented by a mixed-type boundary condition in the splitting time domain. The concentration gradient at the other end of the porous media is assumed to be zero. The temporally dependent velocity and the dispersion coefficients are considered. A numerical solution is obtained by using an explicit finite difference scheme and compared with the analytical result. Accuracy of the solution is discussed by using the root mean square error method. Truncation error is also explored for the parameters like numerical dispersion and velocity terms. The impact of Peclet number is examined. For graphical interpretation, unsteady velocity expressions (i.e., such as exponential, sinusoidal, asymptotic, and algebraic sigmoid) are considered. The work may be used as a preliminary predictive tool for groundwater resource and management.
Using CoBupH MG to adjust aquifer pH - Case Study
Problem A US Government site had elevated TCE. Low aquifer pH stalled in situ bioremediation. Project Goal Inject organic substrate in the aquifer to enable naturally-occuring bacteria to effect in situ anaerobic reductive dechlorination Control pH to sustain long-term performance Achieve regulatory remediation levels of 5 µg/L TCE in groundwater and 53 µg/kg TCE in soil MethodologyTest effectivness of buffered emulsified oil substrate. Phase I Sixteen wells paired to inject and...
A novel approach for providing potable water in rural Sodwana Bay, northern Kwazulu-Natal, South ...
Many people living in the Sodwana area of South Africa do not have access to potable water. Groundwater is the best source of fresh water for the rural community. Potable water in the Zululand coastal plain, Sodwana, South Africa can be enhanced by: (i) providing detailed information on the aquifer system using geophysics; (ii) providing information on groundwater quality and its efficient use; (iii) providing low-cost/low technology local drillers with light-weight, manoeuvrable rigs with trained teams for...
Case Study - Springs: Limestone Fractures - Comal Springs, Texas
Title: 3D Imaging of Karst Fractures at Comal Springs, Texas, USAOrganization: University of Texas at Austin and The Edwards Aquifer AuthorityDate collected: March 2015Location: Comal Springs, Texas, USAInstrument: SuperSting Wi-Fi, 28 electrode AGI Passive Graphite Electrode Marine CableElectrode Spacing: 1 meterArray: Dipole-DipoleNumber of Electrodes: 392
Bacteriological assessment of aquifer storage and recovery (ASR) water in southwest coastal ...
Safe drinking water is scarce in southwest coastal Bangladesh. Harvested rainwater and rain-fed pond water are the main sources of drinking water for people living in this area. Both government and non-government organizations are promoting aquifer storage and recovery (ASR) schemes to provide safe drinking water for this population. This study assessed the bacteriological quality of both source water and abstracted water from five ASR sites. Water sampling and laboratory analysis for indicator bacteria and...
Beaver Dam Groundwater Survey Project, Utah - Case Study
In May 2014, we conducted seismoelectric survey for Willowstick Technologies LLC in Beaver Dam area, Utah, USA. According to our client’s requirement, we designed 3 seismoelectric survey lines, with total 50 measurement stations. After data processing and interpretation, we located 3 layers of aquifers. The red layers are the top and bottom of the first aquifer; the green ones for the second aquifer; the blue ones are the boundary for the deepest water reservoir.