A method for the optimal location of monitoring wells for detection of groundwater contamination in three-dimensional heterogenous aquifers

1997 ◽  
Vol 33 (9) ◽  
pp. 2081-2088 ◽  
Author(s):  
Pascal Storck ◽  
J. Wayland Eheart ◽  
Albert J. Valocchi
Author(s):  
Arun Tom Mathew ◽  
Tirumala Rao Koka ◽  
Murali Krishnan Payangapadan

Single stage gas guns are typically used for accelerating the projectiles in bird and hail impact tests of aerospace components and engines. In this paper an alternative design for single stage gas gun is studied, which is derived from V3 canon. Three dimensional numerical simulations is carried out for the optimal secondary connection angle with the main barrel. A one dimensional code is developed for the V3 canon based design. Design of experiments conducted to find the response surface for the optimal location of the secondary connection, volume and pressure of the secondary tank.


2019 ◽  
Vol 1 (1) ◽  
pp. 33
Author(s):  
Yin Chen Shen

<p><em>According to the requirement, we established a non-linear programming model and a three-dimensional packing model and designed a Drone</em><em> </em><em>Go disaster response system meeting the demand of medical supplement and road video reconnaissance. We also determine the optimal location selection, container assembly schemes, as well as the UAV flight routes and flight plans. </em></p><p><em>First of all, we established a coordinate system to fit the topographic map of Puerto Rico through the digital image processing method and collect the road pixels in the topographic map. Then compared it with the detection range of the UAVs to analyze the exploration area and reconnaissance rate of different flight plans. </em></p><p><em>Second, we establish a nonlinear programming model with the constraint of the distance between the hospitals and the distribution of the medicine. Using time and exploration area as the target function to determine the optimal location and make a best decision by weighing both factors. </em></p><p><em>Third, we establish a model of three-dimensional packaging and using the heuristic algorithm to determine the best package solution of two iso container respectively. The constraint is to take enough medicine and drone to make the two highest utilization rates of the volume of the container, trying to reduce the use of buffer material. </em></p><em>Finally, the optimal flight plan is determined with the consideration of the highest flight safety and detection efficiency of UAV. In the stability analysis of our model, we prove the reliability of our model from different perspectives. Then we analyzed the advantages and disadvantages of our model.</em>


2021 ◽  
Vol 57 ◽  
pp. 142-155
Author(s):  
P.D. Lebedev ◽  
A.A. Uspenskii ◽  
V.N. Ushakov

The problem of finding the optimal location of moving bodies in three-dimensional Euclidean space is considered. We study the problem of finding such a position for two given polytopes A and B at which the Hausdorff distance between them would be minimal. To solve it, the apparatus of convex and nonsmooth analysis is used, as well as methods of computational geometry. Iterative algorithms have been developed and justification has been made for the correctness of their work. A software package has been created, its work is illustrated with specific examples.


2021 ◽  
Vol 80 (9) ◽  
Author(s):  
Ivan Radelyuk ◽  
Mehran Naseri-Rad ◽  
Hossein Hashemi ◽  
Magnus Persson ◽  
Ronny Berndtsson ◽  
...  

AbstractA common problem when studying groundwater contamination in low-income countries is that data required for a detailed risk assessment are limited. This study presents a method for assessment of the potential impact of groundwater contamination by total petroleum hydrocarbons (TPH) in a data-scarce region. Groundwater modeling, using the MODFLOW, was used to simulate regional-scale flow pattern. Then, a semi-analytical contamination transport model was calibrated by minimization of the absolute errors between measured and modeled concentrations. The method was applied to a case study in Kazakhstan to assess the potential spreading of a TPH plume, based on historical observations. The limited data included general information about the local geology, observations of GW level in the area, and concentrations during 5 years of TPH in monitoring wells surrounding the source of the pollution. The results show that the plume could spread up to 2–6 km from the source, depending on estimate of the initial concentrations, until the concentration reaches permissible levels. Sensitivity analysis identified parameters of longitudinal and transverse dynamic dispersivity together with the plume of TPH spreading, as the priority subjects for future investigations. The proposed approach can be used as a tool for governmental and municipal decision-makers to better plan the usage of affected groundwater sites in data-scarce regions. It can also help to decrease the negative impact of contaminated GW on human health and to better manage the industrial pollution.


Author(s):  
O. M. Shpak ◽  
R. B. Havryliuk ◽  
O. I. Lohvynenko

Subsurface contamination with gasoline has occurred within Boryspil airport (Kyiv region) for long period. Previous remedial actions including pumping of gasoline and contaminated groundwater have not provided to remove contamination completely. The monitoring data confirmed the presence of a gasoline layer in most monitoring wells. Using mathematical modelling, we imitated the operation of pumping wells to determine their optimal location. API LNAPL program was applied for calculations. In order to obtain more reliable results, soil hydraulic characteristics were specified by laboratory experiments. A pressure-saturation relation, p(Ѳ) was determined for soil samples taken from Boryspil region, and then the values of α and β parameters describing pore size and distribution were calculated using RETC program. Optimal distances were calculated between pumping wells at two contaminated sites with a gasoline layer of 0,7 and 0,5 m, respectively.


2015 ◽  
Vol 258 (2) ◽  
pp. 815-823 ◽  
Author(s):  
Laura Hervert-Escobar ◽  
Neale R. Smith ◽  
Timothy I. Matis ◽  
Cesar Vargas-Rosales

1992 ◽  
Vol 9 (3) ◽  
pp. 271-288 ◽  
Author(s):  
W. Woldt ◽  
I. Bogardi ◽  
W.E. Kelly ◽  
A. Bardossy

2015 ◽  
Vol 35 (1) ◽  
pp. 110-117 ◽  
Author(s):  
Sarah A. Bourke ◽  
Jonathan Turchenek ◽  
Erin E. Schmeling ◽  
F. Nessa Mahmood ◽  
Barry M. Olson ◽  
...  

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