Vpliv histograma efektivnih padavin na hidrogram odtoka

Povzetek

Ključne besede

Podatki

Jezik:	Slovenski jezik
Leto izida:	2009
Izvor:	Ljubljana
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	[L. Dirnbek]
UDK:	556.12:556.16(043.2)
COBISS:	4460641
Št. ogledov:	2110
Št. prenosov:	708
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	ǂthe ǂeffect on precipitation excess on runoff hydrograph
Sekundarni povzetek:	It is very hard to predict amount of precipitation because rainfall is very complex phenomenon. Through history people have always come across the problem of floods. They have tried to describe and predict rainfall with many mathematical models. In this work rainfall loss methods and their influence on runoff hidrograph have been presented and described. Program HEC-HMS 3.2 has been used and with this program the model for watersheed of river Glinščica has been created. Glinščica is small river and because of that there is lack of measures and data so it has to be used only methods for which there was enough data. For more accurate results and use of more complex methods there would have to be more data. It is also shown how to use synthetic hyetographs and how to correctly arrange precipitation. The results have shown that the use of different loss methods have a greater impact on volume of runoff, maximal runoff, time of peak discharge and total time of direct runoff. Analyses were made with RMSE which showed the fitting of calculated and actual discharge. When all methods were used the results showed shorter time of total direct runoff and peak discharge. Other results were good. The different use of synthetic hyetographs and the different arrangement of precipitation has also impact on volume of runoff, maximal runoff, time of peak discharge and total time of direct runoff. The results showed us that we must use the right loss method and correct arangement of precipitation for modelling watersheeds.
Sekundarne ključne besede:	rainfall loss;hyetogram;hydrograph;discharge;Glinščica;
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Diplomsko delo
Komentar na gradivo:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Strani:	XI, 86 str.
Vrsta dela (ePrints):	thesis
Naslov (ePrints):	The effect of precipitation excess on runoff hydrograph
Ključne besede (ePrints):	padavinske izgube;histogram;hidrogram;odtok;Glinščica
Ključne besede (ePrints, sekundarni jezik):	rainfall loss;hyetograph;hidrograph;discharge;Glinščica
Povzetek (ePrints):	Padavine so zelo kompleksen pojav, ki ga je zelo težko točno napovedati. Prav tako nam skozi celo zgodovino predstavljajo velik problem poplave, ki so vzrok velike količine padavin. V diplomski nalogi sem prikazal pregled metod računanja padavinskih izgub, ki se uporabljajo v svetu ter njihov vpliv na hidrogram odtoka na primeru povodja Glinščice. Model povodja Glinščice sem vzpostavil s programom HEC-HMS 3.2, ki v svoji bazi podatkov vsebuje večje število teh metod in se uporablja za računanje površinskega odtoka. Problem pri modeliranju se pojavi pri manjših povodjih, kjer nam primanjkuje meritev, tako da smo pri uporabi omejeni s preprostejšimi metodami, katere uporabljajo manjše število vhodnih podatkov in večje število poenostavitev. V drugem delu naloge sem prikazal uporabnost sintetičnih histogramov, s pomočjo katerih sem ugotavljal, kako vpliva razporeditev in čas trajanja padavin na končni hidrogram odtoka. Z izračuni sem pokazal, da z izbiro različnih metod padavinskih izgub vplivamo na volumen hidrograma odtoka, maksimalni odtok, čas nastopa maksimalnega odtoka in tudi celotni čas trajanja površinskega odtoka. Rezultate sem ovrednotil s srednjim kvadratičnim pogreškom (RMSE), ki opisuje prileganje izračunanega in izmerjenega hidrograma odtoka. Ugotovil sem, da izbira metode padavinskih izgub vpliva na hidrogram odtoka. Vpliv se vidi predvsem v času pojava konice in simuliranju odtoka po daljšem obdobju padavin. Analiziral sem tudi sintetični histogram in ugotovil, da razporeditev padavin bistveno vpliva na čas nastopa maksimalnega odtoka, prav tako pa tudi na maksimalni odtok, volumen odtoka in celotni čas trajanja površinskega odtoka. Prav tako sem prikazal, kako lahko z neprimerno razporeditvijo (enakomerno razporeditvijo) padavin bistveno vplivamo na količino in čas nastopa maksimalnega odtoka.
Povzetek (ePrints, sekundarni jezik):	It is very hard to predict amount of precipitation because rainfall is very complex phenomenon. Through history people have always come across the problem of floods. They have tried to describe and predict rainfall with many mathematical models. In this work rainfall loss methods and their influence on runoff hidrograph have been presented and described. Program HEC-HMS 3.2 has been used and with this program the model for watersheed of river Glinščica has been created. Glinščica is small river and because of that there is lack of measures and data so it has to be used only methods for which there was enough data. For more accurate results and use of more complex methods there would have to be more data. It is also shown how to use synthetic hyetographs and how to correctly arrange precipitation. The results have shown that the use of different loss methods have a greater impact on volume of runoff, maximal runoff, time of peak discharge and total time of direct runoff. Analyses were made with RMSE which showed the fitting of calculated and actual discharge. When all methods were used the results showed shorter time of total direct runoff and peak discharge. Other results were good. The different use of synthetic hyetographs and the different arrangement of precipitation has also impact on volume of runoff, maximal runoff, time of peak discharge and total time of direct runoff. The results showed us that we must use the right loss method and correct arangement of precipitation for modelling watersheeds.
Ključne besede (ePrints, sekundarni jezik):	rainfall loss;hyetograph;hidrograph;discharge;Glinščica
ID:	8310988