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Methods of Streamflow Measurement
Tučanová, Kamila ; Slavík, Martin (advisor) ; Datel, Josef (referee)
This bachelor thesis focuses in its review part on commonly exploited methods of discharge measurement (velocity-area methods, dilution method, volumetric method, formed constriction methods, slope-area method and rating curve). The principle of discharge measurement and calculation, advantages, disadvantages, and accuracies of individual methods, as well as the type of stream suitable for different method, are reviewed in theoretical part of the thesis based on available literature. In the practical part of the thesis, measurements with selected methods (current meter, FlowTracker, float method and dilution method) were made on 3 lower order streams equipped with Czech Hydrometeorological Institute gauging stations. Discharges collected with individual methods were compared with one another and with the discharges from the gauging stations. Resulted deviations of discharge values were confronted with the accuracies of individual methods presented in the review, and discussed. It was determined, based on 14 values of discharge, that on selected streams, the highest accuracies were reached with FlowTracker (relative deviation up to 12 %). Dilution method had lowest accuracies (relative deviation up to 25 %). The interpretation of the results is complicated due to low resolution of the gauging...
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Water quality development in Mladoticky Brook catchment area
Vacková, Zuzana ; Janský, Bohumír (advisor) ; Benešová, Libuše (referee)
Water quality was one of the biggest problems of environment in beginning of 90. of 20th century in the Czech republic. Since 90. the level of water quality was in czech rivers rapidly better. Mainly in big rivers have accomplished great changes. The small rivers haven't notice that rapid changes. The Czech republic, after entrance to the European Union have committed to comply with Directive 91/271/EEC reduce urban waste water and which should have big influence to water quality also in small rivers. During 90. industry technology, agriculture, cleaning technology of waste water etc. reached big development. Therefore the presumption is higher quality of water in the Czech republic since 90. Goal of the thesis is comparison of results from 1999-2000 with results from 2012- 2014 from Mladoticky brook catchment, which is lined up to small river catchments (79,77km2 ). From this comparison there is obvious trend, if conditions of the water quality are really better or not since 90. [33] Since 2012 to 2014 were taken 12 times samples from 11 profiles of water from Mladotice brook catchment and they were consequential chemically analyzed. The samples were evaluated according to ČSN 757221 and compared with results from 1999-2000. From comparison with data 1999-2000 and 2012-2014 was confirmed the...
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Volume measurement discharge in surface runoff for refine continuous measurement
ŠEBOR, Ondřej
The thesis is divided into theoretical and practical part. The theoretical part includes issues associated with runoff and discharge, methods for discharge measurement and measurements of uncertainties. The practical part of the thesis describes a specific process flow measurement in Kopaninský and Jenínský stream. There is a familiarization with the water flow velocity measurement and comparison methods of volume measurement discharge with continuous measurement. The results of the practical part served to refine the rainfall-runoff processes in research catchment areas. Refined values of the flow rate were used as input data for the calculation of the runoff coefficient and for quantifying the losses of nutrients from the catchment areas. Calculation of the runoff coefficient and nutrient losses were compared for the original and the revised equation discharge curve. Volume measurement discharge has shown that the different conditions above measurement weir during continuous monitoring lead to the uncertainties of measurement. That´s why one has to approach to each flowmeasurement individually and consider the situation in a particular installation.
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Methods for discharge measurement in surface runoff - measurement of uncertainties.
ŠEBOR, Ondřej
The thesis is divided into theoretical and practical part. The theoretical part includes issues associated with runoff and discharge, methods for discharge measurement and measurements of uncertainties. In the practical part of the thesis a specific process flow measurement in Kopaninský stream is describes. The water flow velocity measurement is described and comparison of methods volume measurement discharge with continuous measurement is carried out. The purpose of this work is to gain more accurate data inputs for modeling of rainfall-runoff processes, especially in the calibration and validation stage, as well as for hydrological analysis and other studies conducted in research projects. Often due to different conditions upstream the weirs incorrect results may occur during measurements, so it is important to ensure verification of universal equations in the field with other methods of discharge measurement for further appropriate application. The result of this work is literature overview concerning runoff measurements techniques and measurements uncertainties serving as a basis for the continuation of the thesis. Further the results of practical part are used for primary verifications of continuous discharge monitoring and determination of a new equation of consumption curve.
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