Primerjava meritev pretokov na manjšem vodotoku z Dopplerjevim mrilnikom in metodo razredčenja

diplomska naloga

Alen Mejak (Author), Mojca Šraj (Mentor), Boris Kompare (Thesis defence commission member), Mitja Brilly (Co-mentor)

Abstract

Keywords

VKI;diplomska dela;UNI;pretok;hitrost vode;meritve;Dopplerjev efekt;elektroprevodnost;metoda razredčenja;FloTracker;Flo-tracer;

Data

Language:	Slovenian
Year of publishing:	2010
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[A. Mejak]
UDC:	556.536(043.2)
COBISS:	5225825
Views:	4352
Downloads:	493
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Comparison of dilution and Doppler discharge measuremment methods
Secondary abstract:	Measurements are essential if we are to define hydrological phenomena. The flow is defined as the volume of water within a certain time passes through a cross-section. Over the years, a number of techniques and methods of measurement were created. A number of instruments and devices that measure discharge were developed. By instruments the reliability take precedence over accuracy, because the loss of measurements due to faulty instrument can not be replaced. In my thesis, the majority of those instruments are described and presented. The dilution methodand method using the Doppler effect were described in detail. Principle of the dilution method is injecting a tracer and determing its dilution. This is measured by means of electrical conductivity of water. Doppler effect is the change in frequency of a wave for an observer moving relative to the source. On the basis of change in frequency between sent and received signals the velocity is determined. This thesis compared both methods. For each method nine measurements were made. Measurements were conducted on the same stream and in the same cross section, but in three different days, so that the discharge was different every time. Comparison of measured discharges with both instruments was made. Both instruments were compared also from a practical point of view.
Secondary keywords:	discharge;water velocity;measurement;Doppler effect;electrival conductivity;dillution method;FloTracker;Flo-tracer;
File type:	application/pdf
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. Ljubljana, Fakulteta za gradbeništvo in geodezijo
Pages:	103 f.
Type (ePrints):	thesis
Title (ePrints):	Comparison of dilution and Doppler discharge measurement methods
Keywords (ePrints):	pretok;hitrost vode;meritve;Dopplerjev efekt;elektroprevodnost;metoda razredčenja;FloTracker;Flo-tracer
Keywords (ePrints, secondary language):	discharge;water velocity;measurement;Doppler effect;electrical conductivity;dilution method;FloTracker;Flo-tracer
Abstract (ePrints):	Meritve pretokov so nujne, če želimo opredeliti hidrološke pojave. Pretok je definiran kot volumen vode, ki v določenem času preteče skozi nek prečni prerez. Z leti so se izoblikovale številne tehnike in metode merjenja. Razvili so se tudi številni instrumenti in naprave, s katerimi merimo. Pri izdelavi instrumentov za meritve ima zanesljivost prednost pred točnostjo, kajti izpada meritve zaradi pokvarjenega instrumenta ne moremo več nadomestiti. V diplomskem delu je velika večina teh instrumentov opisanih in predstavljenih. Podrobneje sta opisani metoda razredčenja ter meritev s pomočjo Dopplerjevega efekta. Princip metode razredčenja temelji na dejstvu, da je pri višjih pretokih sledilo bolj premešano, pri nižjih pa manj. To merimo s pomočjo elektroprevodnosti vode. Več kot je sledila (soli), bolj je voda elektroprevodna. Dopplerjev efekt je pojav, ko instrument odda zvočni signal, ta se odbije od nekega predmeta v gibanju, zaradi tega se frekvenca oddanega signala spremeni. Na podlagi spremembe v frekvenci med oddanim in sprejetim signalom se določi hitrost. V diplomskem delu sta primerjani obe omenjeni metodi. Za vsako metodo je narejenih devet meritev. Meritve sem izvajal na istem vodotoku in v istem prerezu. Izvedene so bile v treh različnih časovnih obdobjih, tako da je bil pretok vsakič drugačen. Zanimala nas je primerjava rezultatov, dobljenih po obeh metodah. Instrumenta sem primerjal tudi iz praktičnega vidika uporabe.
Abstract (ePrints, secondary language):	Measurements are essential if we are to define hydrological phenomena. The flow is defined as the volume of water within a certain time passes through a cross-section. Over the years, a number of techniques and methods of measurement were created. A number of instruments and devices that measure discharge were developed. By instruments the reliability take precedence over accuracy, because the loss of measurements due to faulty instrument can not be replaced. In my thesis, the majority of those instruments are described and presented. The dilution methodand method using the Doppler effect were described in detail. Principle of the dilution method is injecting a tracer and determing its dilution. This is measured by means of electrical conductivity of water. Doppler effect is the change in frequency of a wave for an observer moving relative to the source. On the basis of change in frequency between sent and received signals the velocity is determined. This thesis compared both methods. For each method nine measurements were made. Measurements were conducted on the same stream and in the same cross section, but in three different days, so that the discharge was different every time. Comparison of measured discharges with both instruments was made. Both instruments were compared also from a practical point of view.
Keywords (ePrints, secondary language):	discharge;water velocity;measurement;Doppler effect;electrical conductivity;dilution method;FloTracker;Flo-tracer
ID:	8309642