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

Povzetek

Ključne besede

Podatki

Jezik:	Slovenski jezik
Leto izida:	2010
Izvor:	Ljubljana
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	[A. Mejak]
UDK:	556.536(043.2)
COBISS:	5225825
Št. ogledov:	4352
Št. prenosov:	493
Ocena:	0 (0 glasov)
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Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Comparison of dilution and Doppler discharge measuremment methods
Sekundarni povzetek:	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.
Sekundarne ključne besede:	discharge;water velocity;measurement;Doppler effect;electrival conductivity;dillution method;FloTracker;Flo-tracer;
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Diplomsko delo
Komentar na gradivo:	Univ. Ljubljana, Fakulteta za gradbeništvo in geodezijo
Strani:	103 f.
Vrsta dela (ePrints):	thesis
Naslov (ePrints):	Comparison of dilution and Doppler discharge measurement methods
Ključne besede (ePrints):	pretok;hitrost vode;meritve;Dopplerjev efekt;elektroprevodnost;metoda razredčenja;FloTracker;Flo-tracer
Ključne besede (ePrints, sekundarni jezik):	discharge;water velocity;measurement;Doppler effect;electrical conductivity;dilution method;FloTracker;Flo-tracer
Povzetek (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.
Povzetek (ePrints, sekundarni jezik):	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.
Ključne besede (ePrints, sekundarni jezik):	discharge;water velocity;measurement;Doppler effect;electrical conductivity;dilution method;FloTracker;Flo-tracer
ID:	8309642