National Repository of Grey Literature 24 records found  previous11 - 20next  jump to record: Search took 0.00 seconds. 
The methodology of hydrogeologic tracer tests in fractured environment using fluorescent tracers
Bílý, P. ; Rohovec, Jan ; Baier, J. ; Vašíček, R.
The aim of the methodology is defining of optimal tools and effective work flow to perform and well evaluate tracer tests using fluorescent, non toxic tracers. The methodology focuses on in-situ tests in fractures rock environment, applying artificial hydraulic gradient and monitoring of changes in tracer concentration during test period. Data record is continuous and provide inputs into the numerical models.
Estimation of Migration Parameters of Rocks with Fracture Permeability using Fluorescent Solutions : Research Report considering Work Progress and Results Achieved in 2013 Intermediate Report Covering the I. Phase : bibliography and preparatory works
Lachman, V. ; Kovářová, R. ; Novák, P. ; Rohovec, Jan ; Vašíček, R. ; Frydrych, V. ; Patzelt, Z. ; Šigut, R. ; Vachudová, L. ; Durajová, M. ; Koděrová, K.
The proposed project focusing on the use of fluorescent properties during tracer tests reflects the absecne of tracer substances not modifying the hydrochemical properties of the environment and not being radioactive. A positive result of the proposed research will enable more accurate evalutation of absorption properties of the rock environment in case of leakage of hazardous substances than it is for chemical tracers. Fluorescence salts offer the possibility of continuous monitoring of fluorescence changes without endangering the environment and without negative effects on hydrochemistry. Research will proceed according the fillowith scheme: bibliography-laboratory research-field tests-mathematical modeling. The project proposer has already acquired a patent and design rights in the frame of previous research project concerning the developed facility and technology enabling continuous monitoring and evaluation of fluorescence changes in liquids. The investigation of interaction between fluorescent salts and migratory pproperties of the rock environment will focus on rock with fracture permeability. Further selection of fluorescence salts accomplishing the objectives of the project will be based on the detailed bibliographic study. Particular fluorescent salts will be investigated in laboratory scale on selected rocs. Most promising fluorescence solutions will be consequently used for migration tests in specified rock environment with fracture permeability. The research polygon will be equipped with small-diameter boreholes interconnected by fracture network with two network section - with and without sorption properties. The results of both, laboratory and field tests, will be validated by mathematical models.
Changes in chemical composition of surface water at the model catchment Lesni potok during the spring snowmelt 2009
Navrátil, Tomáš ; Dobešová, Irena ; Rohovec, Jan ; Buchtová, Jana
Changes of surface water chemistry during the spring snowmelt were evaluated at the forested experimental catchment Lesni Potok found in National Reservation Area Voděradské bučiny. The pH value of surface waters decreased and together with high discharge it launched changes of solutes concentrations. As a good indicator of groundwater in the discharge were evaluated concentrations of Si and isotopic signature of 18O-H2O. The concentration of the main anion SO42- in waters of Lesni potok oscillated during the spring snowmelt in dependence of ratio between melting snow, soil solution, precipitation and groundwater. During the period of increased penetration of surface soil horizons with the water from melting snow causing the increase of DOC concentrations. Concentrations of DOC determined the export of total Fe. Concentrations of Al with DOC did not correlate because the driving factor on concentrations of Al at Lesni Potok is the surface water pH. Concentrations of NO3- were rapidly decreasing during the snowmelt and at the end of this episodic event NO3- concentrations were trivial due to the rapid flushing of soil horizons.
Mercury Speciation Analysis on Model Samples
Rohovec, Jan ; Hojdová, Maria ; Navrátil, Tomáš
Mercury speciation on model samples of iron oxyhydroxides, aluminum oxyhydroxides and layered materials (montmorillonite) was studied using ICP-EOS-TD technique. The TD curves obtainedare used for interpretation of data measured on real samples.

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