THE EFFECT OF THE SZAMOS RIVER FLODINGS UPON THE VÁSÁROSNAMÉNY SECTION
Z. NAGY
ABSTRACT.
– The effect of the Szamos river floodings upon the Vásárosnamény section of
the River Tisza. The examination aims to model the Tisza/Tisa flooding in
2001, taking in consideration the case, if the 1970 flood arrives on the Szamos/Somes
River and meets the Tisza flood with a delay of a half day. If the tributary
flooding discharge culmination crosses the Tisza flooding culmination, the flood
increasing effect of the tributary is maximum. According the 75 years long data
lines of the Tiszabecs section of River Tisza, it can be proved that the range
of tide has got a rising tendency. Beacuse of the Ukrainian flood control system
development, here the flooding rates decrease, but on the lower section the
flash floods intensity increase. As the flood decreasing reservoirs are
operated, the flash flood culminations can be reduced. The HEC-RAS 1
dimnensional modelling programme offers the possibility to analyse the effects
of these interventions. Without any breaches in dike and with the significant
discharges of the tributaries, an even 1 m higher water level than in 2001, or
a 1000 m3/s bigger maximum discharge can occur, but, in a less
favourable case, even 1-2 m higher water level culminations and 50-60% bigger
culminating discharges can occur.
Keywords: flood decreasing reservoir, 1 dimensional model, section, loop curve.
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