National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Runoff changes in mountain environment, case study Kyrgyz Ridge, Tian Shan
Jedličková, Šárka ; Šobr, Miroslav (advisor) ; Falátková, Kristýna (referee)
The goal of this thesis is to search available statistical methods, which can be used for tracking changes in runoff of rivers in mountain areas (but not exclusively there). One of the most commonly used methods is Mann-Kendall test. Next there is test of homogeneity of time series, which includes for example Pettitt test or Mann-Whitney test. To observe the changes we can also use different models. The thesis gives characteristics of the drainage area of the rivers Ala-Archa, Alamedina a Kara-Balta with focus on their runoff. Runoffs of their river Ala-Archa were studied in years 1928 - 2010. For river Alamedin, only years 1926 - 2010 were analyzed. And for river Kara- Balta, the time series is available only for period of 1927 - 1994. Key words: runoff, statistical methods, mountain environment, Tian Shan, glacier-snow regime
Runoff development in selected catchments in the Kyrgyz Range, Tian-Shan
Jedličková, Šárka ; Šobr, Miroslav (advisor) ; Janský, Bohumír (referee)
The main objective of this paper was to investigate runoff changes in the catchment Ala-Arca, Alamaedin and Kara-Balta in Kyrgyzstan, as well as change in climate conditions from available stations in the area. The runoff, precipitation, and temperature series were subjected to monthly, seasonal and annual analyses based on available data. Both absolute and relative data homogeneity were verified using statistical tests such as the Mann-Whitney-Pettit test, the SNHT test, and the WiIlcoxon's two- sample test for absolute homogeneity, and the Alexandersson's test for relative homogeneity. The Mann-Kendall test was used to determine the trend in each serie. There were inhomogeneities found in a number of runoff data. In most cases, the changes of rivers Ala-Arca and Kara-Balta were recorded in 1987. Compare to Ala-Arca and Kara-Balta, the changes of river Alamedin were recorded 3 years later, in 1990. There was a positive trend development by the rivers with the glacial-snow regime. However, there was no statistically significant trend for the entire time series. Key words: runoff change, precipitation, temperature, glacial-snow regime, snow-glacial regime, homogenization, Mann-Whitney-Pettit test, trend, Mann-Kendall test, glaciation, Kyrgyzstan, Tien- Shan
Runoff changes in mountain environment, case study Kyrgyz Ridge, Tian Shan
Jedličková, Šárka ; Šobr, Miroslav (advisor) ; Falátková, Kristýna (referee)
The goal of this thesis is to search available statistical methods, which can be used for tracking changes in runoff of rivers in mountain areas (but not exclusively there). One of the most commonly used methods is Mann-Kendall test. Next there is test of homogeneity of time series, which includes for example Pettitt test or Mann-Whitney test. To observe the changes we can also use different models. The thesis gives characteristics of the drainage area of the rivers Ala-Archa, Alamedina a Kara-Balta with focus on their runoff. Runoffs of their river Ala-Archa were studied in years 1928 - 2010. For river Alamedin, only years 1926 - 2010 were analyzed. And for river Kara- Balta, the time series is available only for period of 1927 - 1994. Key words: runoff, statistical methods, mountain environment, Tian Shan, glacier-snow regime

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