Abstract
In this paper, an autocorrelation and cross-correlation analysis of the flow of the Kupa and Sava rivers was performed. The analysis was performed at hydrological stations close to the confluence of these two rivers near the city of Sisak, based on data of mean daily flows and daily precipitation. The analysed time period is from 2008 to 2017, with the series being divided into two parts of five years each, from 2008 to 2012 and 2013 to 2017. Daily flow data were measured at the hydrological stations Farkašić on the Kupa River and Crnac on the Sava River, and data on precipitation at the main meteorological station and the automatic meteorological station Sisak. The maximum value of the cross-correlation function between the hydrological stations at the Kupa and Sava rivers is very high, but at a time lag of zero days. The value of the cross-correlation function remains high, up to 0.6 and up to a 4 day lag. The cross-correlation function between precipitation and hydrological data has a very low maximum value.
Highlights
In this paper, an autocorrelation and cross-correlation analysis of the flow of the Sava River and the Kupa River near their confluence was made
The autocorrelation function was obtained using a spreadsheet program in Excel (Posavec et al, 2017) by entering data on the daily flows of the Kupa and Sava rivers over a period of 10 years, divided into two periods of 5 years each
In addition, this analysis will provide an answer to whether, apart from the flow rates, something has changed in the speed of influence between the Kupa and the Sava rivers in these two periods at that confluence
Summary
An autocorrelation and cross-correlation analysis of the flow of the Sava River and the Kupa River near their confluence was made. The confluence of the Kupa and Sava rivers is located in Sisak. Sisak is a city on three rivers, the Sava, Kupa and Odra. The river Odra flows into the Kupa River, near Sisak. Of the three mentioned rivers, the Sava and Kupa rivers have the most impressive hydrological regime, since the size of the basin next to the Farkašić station on the Kupa River is 8,992 km, and the basin next to the Crnac station on the Sava River is 22,852 km. Compared to the Kupa and the Sava, the Odra River is a very small river, only 83 km long with a basin size of 604 km. The city of Sisak and its surroundings, which include smaller towns and villages through which rivers flow, are hydrologically very interesting.
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