scholarly journals Research of subsurface contamination with gasoline within Boryspil airport using mathematical modelling

2020 ◽  
pp. 49-53
Author(s):  
O. M. Shpak ◽  
R. B. Havryliuk ◽  
O. I. Lohvynenko
Keyword(s):  
Mathematical Modelling ◽  
Laboratory Experiments ◽  
Optimal Location ◽  
Contaminated Sites ◽  
Hydraulic Characteristics ◽  
Subsurface Contamination ◽  
Monitoring Wells ◽  
Long Period ◽  
Pumping Wells ◽  
Remedial Actions

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.

scholarly journals A NONLINEAR MODEL OF IRREGULAR WAVE RUN-UP HEIGHT A D PERIOD DISTRIBUTIONS ON GENTLE SLOPES

1984 ◽  
Vol 1 (19) ◽  
pp. 29 ◽  
Author(s):  
Toru Sawaragi ◽  
Koichiro Iwata
Keyword(s):  
Nonlinear Model ◽  
Laboratory Experiments ◽  
Sandy Beach ◽  
Probability Distributions ◽  
Field Measurements ◽  
Wave Period ◽  
Irregular Wave ◽  
Long Period ◽  
Proposed Model ◽  
Run Up

This paper discusses the probability distributions of irregular wave run-up height and period on gentle slopes. Assuming that the long period component appeared on the run-up oscillation corresponds to the incident envelope wave period, a nonlinear model to estimate the probability distributions of run-up heights and periods is proposed. Laboratory experiments on gentle slopes of 1/15,1/30 and 1/40, and field measurements on a natural sandy beach with swash slopes of 1/6 to 1/14 were performed to examine the proposed model. The proposed model is shown to agree with the experiments.

A Remediation Study of Soils Contaminated by Chlorinated Hydrocarbons with Mechanical Soil Aeration

2014 ◽  
Vol 878 ◽  
pp. 751-759
Author(s):  
Yi Shi ◽  
Fa Sheng Li ◽  
Xiao Ming Du ◽  
Zhu Xu ◽  
Yan Ma ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Vapor Pressure ◽  
Low Cost ◽  
Ex Situ ◽  
Contaminated Sites ◽  
Similar Concentration ◽  
Soil Aeration ◽  
Long Period ◽  
Volatile Organic ◽  
Lower Vapor Pressure

Mechanical soil aeration is an effective and low cost ex-situ remediation technique suitable for large areas of volatile organic contaminated sites. To understand the effectiveness of the remediation technique, the current study remediated an abandoned industry site for a typical chlor-alkali chemical using this technology. The results showed that the technology is effective in the remediation of volatile organic compounds with a pass percentage greater than 90%. The results also showed that a lower vapor pressure or higher molecular weight with the similar concentration of pollution resulted in higher residual concentrations, which need increasing agitation frequency or machine power to promote the volatilization of pollutants. In addition, we found that the more pollution or water or organic matters (more than 1%) contained, the higher concentration of residual. These type of soils should be remediated not only by physical agitations but also by other strengthen measures and long period. The present study aims to promote the remediation of contaminated sites, especially large areas contaminated by volatile contaminants.

Optimal groundwater contamination monitoring using pumping wells

2010 ◽  
Vol 62 (3) ◽  
pp. 556-569 ◽  
Author(s):  
Shahar Shlomi ◽  
Avi Ostfeld ◽  
Hillel Rubin ◽  
Christine Shoemaker
Keyword(s):  
Groundwater Quality ◽  
Transport Model ◽  
Decision Variable ◽  
Unsteady State ◽  
Study Objective ◽  
Monitoring Wells ◽  
Pumping Wells ◽  
Contaminant Sources ◽  
Contaminant Distribution ◽  
Optimal Evaluation

This study presents a new method for selecting monitoring wells for optimal evaluation of groundwater quality. The basic approach of this work is motivated by difficulties in interpolating groundwater quality from information collected for only few sampled wells. The well selection relies on other existing data relevant to contaminant distribution in the sampling domain, e.g. predictions of models which rely on past measurements. The objective of this study is to develop a method of selecting the optimal wells, from which measurements could best serve some external model, e.g. a kriging system for characterizing the entire plume distribution, a flow-and-transport model for predicting a future distribution, or an inverse model for locating contaminant sources or estimating aquifer parameters. The decision variable at each sampling round determines the specific wells to be sampled. The study objective is accomplished through a spatially-continuous utility density function (UDF) which describes the utility of sampling at every point. The entire methodology which utilizes the UDF in conjunction with a sampling algorithm is entitled the UDF method. By applying calculations in steady and unsteady state sampling domains the effectiveness of the UDF method is demonstrated.

scholarly journals Hydraulic Conductivity Estimation Using Low-Flow Purging Data Elaboration in Contaminated Sites

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 898
Author(s):  
Francesco Maria De Filippi ◽  
Silvia Iacurto ◽  
Flavia Ferranti ◽  
Giuseppe Sappa
Keyword(s):  
Hydraulic Conductivity ◽  
Unconfined Aquifer ◽  
Alluvial Aquifer ◽  
Water Levels ◽  
Low Flow ◽  
Contaminated Sites ◽  
Disposal Site ◽  
Large Area ◽  
Monitoring Wells ◽  
Groundwater Characterization

Hydrogeological characterization is required when investigating contaminated sites, and hydraulic conductivity is an important parameter that needs to be estimated. Before groundwater sampling, well water level values are measured during low-flow purging to check the correct driving of the activity. However, these data are generally considered only as an indicator of an adequate well purging. In this paper, water levels and purging flow rates were considered to estimate hydraulic conductivity values in an alluvial aquifer, and the obtained results were compared with traditional hydraulic conductivity test results carried on in the same area. To test the applicability of this method, data coming from 59 wells located in the alluvial aquifer of Malagrotta waste disposal site, a large area of 160 ha near Rome, were analyzed and processed. Hydraulic conductivity values were estimated by applying the Dupuit’s hypothesis for steady-state radial flow in an unconfined aquifer, as these are the hydraulic conditions in pumping wells for remediation purposes. This study aims to show that low-flow purging procedures in monitoring wells—carried out before sampling for groundwater characterization—represent an easy and inexpensive method for soil hydraulic conductivity estimation with good feasibility, if correctly carried on.

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