Numerical modeling of groundwater flow at a coal exploration site in Eskişehir – Turkey

Download
2016
Kılıç, Hatice
Numerical groundwater models are useful tools for the evaluation of the complex groundwater systems in the pre-feasibility phase of the mining activities. They can be used to simulate three-dimensional groundwater system and its interaction with these activities. The purpose of this study is to develop conceptual and numerical models of the groundwater flow and evaluate the impact of preliminary dewatering of a coal exploration site in Eskişehir, Turkey. In this study, conceptual model including calculations of hydrologic-hydrogeological budgets were developed at the first stage. Then, groundwater flow regime was modeled and calibrated under steady state conditions by a three-dimensional finite difference model, namely MODFLOW SURFACT. After conducting sensitivity analyses, calibrated model was used to predict the quantity of inflow to preliminary designs of the underground coal panels. During this process, effect of no flow boundary condition at the northwestern part of the study area on dewatering was also analyzed. For the impact assessment, drawdown maps and the groundwater budgets calculated after dewatering simulations were evaluated. These simulation results indicate that the average groundwater inflows are about 129.72 L/s and 33.08 L/s to the deeper and shallower panels, respectively. Although most of the pumping wells will not be significantly affected by these simulations, decrease in the amounts of baseflow to Porsuk Stream and discharge from the springs-captages is expected.

Suggestions

A preliminary study on the use of reservoir simulation and coal mine ventilation methane measurements in determining coal reservoir properties
Erdoğan, Sinem Setenay; Okandan, Ender; Kracan, Cevat Özgen; Department of Petroleum and Natural Gas Engineering (2011)
This thesis investigates methane emissions and methane production potentials from abandoned longwall panels produced or emitted due to mining activities either from coal seam or any underlying or overlying formations. These emissions can increase greenhouse gas concentrations and also pose a danger to the underground working environment and to miners. In addition to the safety issues, recovery and utilization of this gas is an additional source of energy. In this study, methane concentrations measured from ...
Environmental applications of hyperspectral anomaly and target detection algorithms
Soydan, Hilal; Karpuz, Celal; Department of Mining Engineering (2017)
The objective of this thesis study is to understand the capacity of hyperspectral anomaly detection and target detection algorithms for contamination mapping, with a focus on developing a new methodology for environmental problems related to coal mining operations. Considering the data availability, specific chemical structure and reflectance properties as well as being one of the common contaminants in mining operations, hydrocarbon induced problems are studied for water and soil medium separately. Having ...
Soil contamination mapping for an abandoned coal mine site by using worldview 2 and aster imagery
Soydan, Hilal; Düzgün, H. Şebnem; Department of Mining Engineering (2013)
Being an indispensable economic and energy source, coal mining may be the cause of long term environmental damages like serious water and soil contamination due to inappropriate mining operations. In order to detect and avoid it, mapping the contamination levels related to mining industry has been a challenge for soil scientists to find the most appropriate and time and cost effective method for constructing soil contamination maps. So far, Remote Sensing (RS) and Geographical Information Systems (GIS) have...
A process-based diagnostic approach to model evaluation: Application to the NWS distributed hydrologic model
Yılmaz, Koray Kamil; Wagener, Thorsten (American Geophysical Union (AGU), 2008-09-11)
Distributed hydrological models have the potential to provide improved streamflow forecasts along the entire channel network, while also simulating the spatial dynamics of evapotranspiration, soil moisture content, water quality, soil erosion, and land use change impacts. However, they are perceived as being difficult to parameterize and evaluate, thus translating into significant predictive uncertainty in the model results. Although a priori parameter estimates derived from observable watershed characteris...
Probabilistic models for the initiation of seismic soil liquefaction
Çetin, Kemal Önder; Kiureghian, AD; Seed, RB (2002-01-01)
A Bayesian framework for probabilistic assessment of the initiation of seismic soil liquefaction is described, A database, consisting of post-earthquake field observations of soil performance, in conjunction with in situ "index" test results is used for the development of probabilistically-based seismic soil liquefaction initiation correlations. The proposed stochastic model allows full and consistent representation of all relevant uncertainties. including (a) measurement/estimation errors, (b) model imperf...
Citation Formats
H. Kılıç, “Numerical modeling of groundwater flow at a coal exploration site in Eskişehir – Turkey,” M.S. - Master of Science, Middle East Technical University, 2016.