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Acid tar lagoons (ATLs) are a common source of groundwater pollution in industrialized countries worldwide. Even after recultivation, the spatial extent of the residual environmental pollution from such lagoons is often unknown, as the monitoring of groundwater is mostly done in discrete locations ? monitoring wells. Shallow surface geophysical methods, such as ground penetrating radar (GPR) and electrical resistivity tomography (ERT) are often used in monitoring groundwater and soil contamination. The greatest va...

This report is a case study on use of Electrical Resistivity Tomography (ERT) alongside other methods to have a better understanding of surface depressions and their formation in gypsum karst region of Latvia. Study territory is well known gypsum karst region. It is a relatively flat area with up to 5m thick Quaternary cover overlaying Upper Devonian Salaspils Formation gypsum sediments. Previous studies have identified several sinkhole formations in the area. Remote sensing methods like analysis of Digital Elevat...

In this study, we present series of GPR experiments to identify and solve problems, which might be encountered while carrying out GPR survey in sandy soils for various purposes. Study was carried out in the Smeceres sils sand-gravel quarry, which is located in the Madona-Trepe ice-marginal ridge in Eastern Latvia. This specific quarry was selected as a study site, because it has a boulder pavement located in its uppermost part. Two similar experiments were carried out in dry (after long period of dry weather condi...

Quaternary sand-gravel mixture and sand deposits are among the most significant raw mineral resources needed for construction industry in Latvia. As regulations of Cabinet of Ministers of Republic of Latvia No. 570 states пїЅ geological prospecting has to consist of data acquired by drilling. Following study presents results of ground penetrating radar (GPR) surveying combined with traditional prospecting methods for A (proved) and N (probable) category sand-gravel and sand deposits. Geological prospecting for dep...