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Measurement of Stream Flow Rate Using Salt Dilution Method
Burdych, Marek ; Ondovčin, Tomáš (advisor) ; Slavík, Martin (referee)
Tracer dilution method for measuring flow rate in surface streams is the main topic of the bachelor's thesis. The first part contains a summary of the most important flow measuring techniques for surface streams, including current meter, float method, FlowTracker, ADCP, volumetric method, and computing techniques based on channel cross-section data. Large part is dedicated to tracer dilution method. The findings of field measurements of flow made on the Lo- děnice River using the salt dilution approach are detailed in the second section. Five conductometers were used to measure the water conductivity at three di- fferent sites. Conductometry was performed simultaneously in two different distances from injection site. Throughout the experiment, a sixth conductome- ter recorded the background conductivity value as a standard. The predicted flow values are compared to those acquired from nearby hyd- rometric station of the Czech Hydrometeorological Institute (CHMI) and from observations made using Flowtracker. Diferences in measured flow rate were interpreted as tracer losses. These losses were estimated. Keywords: hydrology, surface water, water stream, tracer dilution, conducti- vity, tracer
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Tracing and surveying of accidental changes of the river bed of Ostřice.
KUBÁT, Michal
The work is focused on monitoring and detail survey of eventual changes in Ostřice river bed in Horní Planá cadastre area. It was done in two phases in different seasons. The work objective is to outline and secure position of cross sections on the sides of the river polygon, followed by their survey. The work consists of two sections {--} theoretical and practical. The theoretical section first explains establishment of a dot field by geodetic points. This is followed by description of a detail dot field, requirements for the individual points, methods of their survey, detail mapping of these points as well as establishment of water stream lengthwise sections and cross sections. The practical part includes characteristics of the surveyed location. In addition there is description of preparatory work, necessary for land survey and the survey itself, using both existing and newly established points of the dot field. At the end there is explanation of auxiliary and detail points calculation and method of their graphic processing. The conclusion includes assessment of changes between April and August surveys of the subject territory.
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