magistrsko delo
Abstract
Z radarski satelitskimi posnetki spremljamo površje ne glede na vremenske pogoje, kar omogoča zajetno časovno vrsto posnetkov in številne aplikacije. Magistrsko delo se ukvarja z oceno kakovosti zaznave vodnih površin s spletno aplikacijo VodaKje.si. Na območju kraške Ljubljanice so se izvajale analize v daljših časovnih obdobjih. Podatki so bili primerjani z uradnimi podatki o vodostajih in padavinah. Pokazali smo, da so korelacije med podatki dobre, najvišja je korelacija na manjših nadzorovanih območjih z rednimi poplavami (Planinsko in Cerkniško polje). Toplotne karte, izdelane iz seštevka vseh prepoznanih vodnih površin, kažejo na ustrezno ujemanje največkrat poplavljenih površin. Te karte so opozorile na pomembnejšo pomanjkljivost podatkov, to je manj uspešno zaznavanje pod gostejšo vegetacijo (gozd in sorodna vegetacija), ki pa se jo da odpraviti s preučitvijo vegetacije. Tudi primerjava toplotnih kart z integralnimi kartami poplavne nevarnosti pri pretoku Q10 kaže na ustreznost zaznavanja vodnih površin. Na območju spodnje Krke je bil preučevan poplavni dogodek, ki so ga sateliti posneli v dveh časovnih presekih (17. in 22. septembra 2017). Rezultati primerjave hidravličnega modela tega poplavnega dogodka in satelitskih posnetkov kažejo, da je ujemanje površin glede na specifičnost poplavnih dogodkov vodotokov zelo dobro. Ne-ujemanje površin, določenih s posameznim pristopom, je večinoma možno pojasniti z dejansko rabo oz. analizo poplavnih robov. Podatki VodaKje.si so glede na preučeno primerni za samostojno raziskovanje visokovodnih površin na območjih s počasnejšo dinamiko vode. Ob primeru pridobitve ustreznega posnetka poplavnega dogodka pa so dober vir informacij pri preučevanju poplav in koristna informacija za beleženje poplavnih površin.
Keywords
geodezija;magistrsko delo;satelitski posnetki;Sentinel-1;poplave;VodaKje.si;Ljubljanica;Krka;
Data
Language: |
Slovenian |
Year of publishing: |
2021 |
Typology: |
2.09 - Master's Thesis |
Organization: |
UL FGG - Faculty of Civil and Geodetic Engineering |
Publisher: |
J. Breznikl] |
UDC: |
528.7:556.531/.532(497.4)(043.3) |
COBISS: |
68192259
|
Views: |
22 |
Downloads: |
0 |
Average score: |
0 (0 votes) |
Metadata: |
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Other data
Secondary language: |
English |
Secondary title: |
Water dynamics analysis using Sentinel-1 satellite image time series |
Secondary abstract: |
Radar satellites, such as Sentinel-1, allow us to monitor the Earth's surface regardless of weather conditions, day or night. This generates an extensive time series of satellite images and enables numerous applications. The master thesis deals with the assessment of the quality of the detected water areas of the portal VodaKje.si. Analyses were carried out in the karst area of the Ljubljanica River over longer periods of time. The collected data were compared with official water level and precipitation data. The correlation was highest in smaller regions with regular floods (Planina and Cerknica polje). Heat maps produced by summing all identified water areas show correspondence with the most frequently flooded areas. The maps indicate that detection is less good under dense vegetation (forest and related vegetation). Comparison of the heat maps with the integral flood hazard maps at discharge with 10 years return period shows the adequacy of the Vodakje.si water detection. In the area of the lower Krka River, a flood event observed by Sentinel-1 satellites on two dates (17 and 22 September 2017) was studied. Comparison of the hydraulic model of this event and the detected areas from satellite images shows that the agreement is very good. The discrepancy between the areas identified by each approach can be largely explained by land use or flood edge analysis. The VodaKje.si data are suitable for independent study of floodplains in areas with slower water dynamics. If the timing of the imaging fits well with the flood event, it is a good source of information also in the study of floods and useful for floodplain mapping. |
Secondary keywords: |
geodesy;master thesis;satellite images;Sentinel-1;floods;VodaKje.si;Ljubljanica river;Krka river; |
Type (COBISS): |
Master's thesis/paper |
Study programme: |
0 |
Embargo end date (OpenAIRE): |
1970-01-01 |
Thesis comment: |
Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo |
Pages: |
XXVI, 113 str., [10] pril. |
ID: |
12515748 |