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

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.


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 ...
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...
Assessment of open pit dewatering requirements and pit lake formation for Kışladağ gold mine, Uşak-Turkey
Ünsal, Burcu; Yazıcıgil, Hasan; Department of Geological Engineering (2013)
The main purposes of this research are (1) to quantify the dewatering requirements for Kışladağ gold mine (Uşak–Turkey) in order to provide stable and dry conditions for mining during the operational period, (2) to assess the pit lake formation in post-closure period, and (3) to assess the impacts of these effects on groundwater resources. Following the development of the site conceptual model, a numerical groundwater flow model is set up and calibrated under steady state conditions and sensitivity analyses...
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 ...
Assessment of Dewatering Requirements and their Anticipated Effects on Groundwater Resources: A Case Study from the Caldag Nickel Mine, Western Turkey
Peksezer-Sayit, Ayse; Cankara-Kadioglu, Cigdem; Yazıcıgil, Hasan (2015-06-01)
Dewatering requirements of three open pits located in western Turkey and the impact of dewatering on groundwater resources were evaluated using a three-dimensional numerical groundwater flow model. The groundwater was modeled using MODFLOW software and the dewatering was simulated using the MODFLOW Drain Package. The drain cell configurations were determined by pit boundaries; invert elevations of drains corresponded to the bench elevations in the mining schedule, which varied dynamically among the three pi...
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.