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The Impact of Hydrologic Characteristics of Mountain Watersheds on Geometric and Hydraulic Parameters of Natural Torrent Beds

Jakubis Matúš, Jakubisová Mariana

Journal of Ecological Engineering

2019

Vol. 20, nr 3

13--23

The aim of the paper is to determine the geometric and hydraulic characteristics of natural torrent beds and to propose a regional hydraulic geometry equations of mountain watersheds for the High Tatras region. The research was conducted in 26 natural torrents and their watersheds on the reference sections and profiles under the sediment source zones. Two different regression equations to determine the relationships of hydraulic geometry (hitherto used without asymptote and newly proposed with asymptote) were compared. The analyses showed a strong correlation relationship between watershed area Aw (km2) and bankfull geometric characteristics of natural cross-sections: width of the bed inside the banks Bbf (m), mean depth of the bed Hbf (m), channel cross-section area Abf (m2) and hydraulic characteristic – bankfull discharge Qbf (m3.s-1). The results were tested by t-test and Shapiro-Wilk test. The determination coefficient (R2) for the relationships without asymptote ranged between R2 = 0.919 and R2 = 0.972; p – values from Shapiro – Wilk test ranged between p = 0.0359 and p = 0.8027. The determination coefficient (R2) for the relationships with asymptote ranged between R2 = 0.952 and R2 = 0.974; p – values from Shapiro – Wilk test ranged between p = 0.0221 and p = 0.8617. Based on the analysis we found that the new equation with the asymptote provides very good results.