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Modeliranje taljenja snežne odeje s programoma HEC-HMS in SRM : diplomska naloga
Kofol, Tina (Author), Šraj, Mojca (Mentor) More about this mentor... This link opens in a new window, Brilly, Mitja (Co-mentor), Žagar, Dušan (Thesis defence commission member), Panjan, Jože (Thesis defence commission member)

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Abstract
Sneg je v hidrološkem krogu zelo pomemben dejavnik, saj se v njem zadržuje velik del vode. Hitro taljenje snežne odeje lahko povzroči poplave, pomanjkanje snega v nekaterih porečjih pa lahko vodi v poletne suše. V diplomski nalogi smo primerjali programa HEC-HMS (verzija 3.5) in SRM (verzija 1.12), s pomočjo katerih smo modelirali odtok zaradi taljenja snežne odeje s porečja Sava-Kranjska Gora. V prvem delu naloge je opisana energijska bilanca snežne odeje, fizikalni procesi, ki so vključeni v nalaganju, preobrazbi in taljenju snega ter osnovne enačbe, ki te procese opisujejo. Na nastanek snežnih padavin vplivajo razmere v oblakih, na porazdelitev in višino snežne odeje pa dejavniki kot so: veter, vegetacija, temperatura zraka, sončno sevanje, padavine in kondukcija toplote iz zemljišča. Pri računanju taljenja snega moramo biti pozorni tudi na gostoto, temperaturo in albedo snežne odeje. Za določitev količine staljene vode je ključno poznavanje snežnega vodnega ekvivalenta (SVE), ki nam poda količino vode, ki bi jo dobili, če bi se vzorec snega v celoti stalil. Za napovedovanje pretokov in računanje taljenja snega se uporabljata dva osnovna pristopa: podatkovno obsežnejša metoda energijske bilance in metoda temperaturnega indeksa, ki je preprostejša za uporabo, vendar manj natančna. Oba programa, HEC-HMS in SRM, delujeta na principu temperaturnega indeksa. V nadaljevanju so predstavljene naravno-geografske in hidrološke značilnosti prispevnega območja porečja Sava-Kranjska Gora in priprava potrebnih vhodnih podatkov za oba modela. Modela sta bila umerjena na osnovi izmerjenih padavinskih dogodkov in pretokov dveh mesecev. Sledijo rezultati umerjanja, analiza občutljivosti in primerjava rezultatov obeh modelov.

Language:Slovenian
Keywords:gradbeništvo, diplomska naloga, UNI, VKI, taljenje snežne odeje, metoda energijske bilance, metoda temperaturnega indeksa, porečje Sava-Kranjska Gora, HEC-HMS, SRM
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2014
Publisher:T. Kofol
Number of pages:XV, 107 str.
Place:Ljubljana
UDC:004:551.57:556.12(043.2)
COBISS.SI-ID:6612833 This link opens in a new window
Views:1852
Downloads:454
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Secondary language

Language:English
Title:Snowmelt modeling with HEC-HMS and SRM model
Abstract:
Snow is a very important factor in the hydrological cycle, since it retains a large part of water. Rapid snowmelt can cause flooding, while on the other hand, the lack of snow in some river basins can lead to summer draught. Therefore the comparison of two snowmelt models HEC-HMS (version 3.5) and SRM (version 1.12) for the Sava-Kranjska Gora basin has been made in this thesis. In the first part of the thesis we described energy budget of snow cover, physical processes involved in snow accumulation, metamorphosis and melt, and fundamental equations that describe these processes. The formation of snow is affected by the conditions in clouds; the distribution and amount of snow depends on factors such as wind, vegetation, air temperature, solar radiation, precipitation and heat conduction from the ground. Snowmelt, density, temperature and snow albedo have to be considered by computing. For the determination of the melted water knowledge of snow water equivalent (SWE) is required. SWE gives us the amount of water that would be obtained if the sample of snow is fully melted. Basic approaches for streamflow forecasting and computing snowmelt are: extensive data energy budget method and temperature index method which is simpler to use, but less accurate. Both models, HEC-HMS and SRM, calculate snowmelt with the temperature index approach. Further, the physical geographical and hydrological characteristics of the drainage basin of the Sava-Kranjska Gora and preparation of the necessary input data for both models are presented. The models were calibrated based on measured precipitation events and runoff of two months. The thesis also contains the results of the calibration, the sensitivity analysis and the comparison of models.

Keywords:graduation thesis, civil engineering, snowmelt, energy budget method, temperature index method, Sava-Kranjska Gora river basin, HEC-HMS, SRM

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