TVORBA A KALIBRÁCIA ZRÁŽKOVO-ODTOKOVÉHO MODELU ÚZEMIA PRE POTREBY PROTIPOVODŇOVÉHO VAROVNÉHO SYSTÉMU

CREATION AND CALIBRATION OF RAINFALL – RUNOFF MODEL FOR THE NEEDS OF FLOOD WARNING SYSTEM

Ivan MRNČO ^A*, Peter BLŠTAK ^B, Peter HUDEC ^C, Tomáš GIBALA ^D, Eva MICHAELI ^E

Received: November 30, 2013 | Revised: January 10, 2014 | Accepted: February 25, 2014

^A* ITKON, spol. s r. o., Dohnányho 2, 917 02 Trnava, Slovakia
ivan.mrnco@itkon.sk (corresponding author)
^B ITKON, spol. s r. o., Dohnányho 2, 917 02 Trnava, Slovakia
peter.blstak@itkon.sk
^C ITKON, spol. s r. o., Dohnányho 2, 917 02 Trnava, Slovakia
peter.hudec@itkon.sk
^D DHI SLOVAKIA s.r.o., Hattalova 12, 831 03 Bratislava, Slovakia
t.gibala@dhi.sk
^E University of Prešov, 17. novembra 1, 080 01 Prešov, Slovakia
eva.michaeli@unipo.sk

FULL TEXT

Abstract
The paper deals with the applications of the modern computational methods to address global flood forecasting and warning system. This will be built on the basis of the mathematical computer model of the selected area, where the computer model will simulate the processes associated with rainfall runoff. For selected area is simulated runoff water from the area by river. Drain water from the area is secured using flow through sewer network. For excessive rainfall event diluted water from sewer network is outlet to the river, which can cause elevated levels of water flow in river and cause local flooding. Therefore, the scope of the project is to investigate the interaction of sewage network and water flow to the extent of flooding in the assessed area. Behavior of water flow in river and in the sewer network is simulated using two mathematical computer models. Mathematical computer model MIKE 21 FM is used to simulate runoff processes in the river in a 2D environment and mathematical computer model MIKE URBAN-MOUSE is used to simulate runoff processes in the sewer network. Both models are interconnected, and the results of one serve as input boundary conditions for the second model and vice versa. Such interconnection between the two models is possible to perform the simulation of rainfall-runoff conditions of the area. An important element in the construction of a mathematical model is calibrated on the basis of measured values that were collected during the measuring campaign. For calibration of rainfall-runoff conditions in the stream are the values of the water level in the river channel and for calibration of rainfall-runoff conditions in the sewer network are the values of the water level in the collecting system and flow measuring for campaign period. Along with these values, it is important to collect information on the occurrence of rainfall in the study area during the measuring campaign. This is done using rain gauges, which record information about yield reductions. Based on these data, compiled mathematical model is calibrated so as accurately simulate the actual condition. Thus prepared model is used to simulate different load conditions, their evaluation and to propose measures that eliminate flood damage. This leads to the protection of property, land, public health and promoting the development of an urbanized area.

Key words
Flood, mathematical modeling, hydroinformatics, development of urban areas

SUMMARY

CREATION AND CALIBRATION OF RAINFALL – RUNOFF MODEL FOR THE NEEDS OF FLOOD WARNING SYSTEM
Aim of the study was to create and calibrate rainfall-runoff model for the needs of flooding warning system. For the study there was selected area located south of city of Trencin and north of city of Trencianska Turna. Inside the area is located shopping center Laugaricio with sewage network. Rainfall-runoff waters are collected to the small river Lavickovy potok which is crossing selected area. Huge rainfall event is causing increasing of water level in river from sewage network. There have been prepared two mathematical models for the simulation of hydraulic conditions for the sewer network and for the river. Mathematical computer model MIKE 21 FM was used to simulate runoff processes in the flow in a 2D environment and mathematical computer model MIKE – mouse was used to simulate runoff processes in the sewer network. Both models are interconnected, and the results of one serve as input boundary conditions for the second model and vice versa. Such interconnection between the two models is possible to perform the simulation of rainfall-runoff conditions of the area. An important element in the construction of the mathematical model was calibration based on the measured values, which were collected during the measuring campaign. In the case of calibration for rainfall-runoff conditions in terms of flow to value water level in the river channel and for calibration of rainfall-runoff conditions in the collecting system are the values of the water level in the collecting system and flow measuring campaign period. The results of the simulation of rainfall-runoff process and its transformation in the area of extreme precipitation shows that result will in the inundation of the area. There have been prepared graphic Annexes of 2D model calculated the elevation of water level, water depth and extent of flooding. Simulation results show that sewerage network despite the extreme collision fulfills its function, but it carries an increased share of the bench creek, leading to local flooding area downstream flow. Calibrated rainfall-runoff model with models of hydraulic flow in the drainage system is a fundamental basis for further development options for flood forecasting system.

REFERENCES

1. MRNČO I., POLÁČEK M., BLŠTAK P., HUDEC P., GIBALA T., BRTKO P. 2012. Odvádzanie odpadových vôd ako zdroj povodňového znečistenia: Konferencia Odpadové vody 2012, NOI Bratislava, ISBN: 978-80-970896-2-7
2. MRNČO I., BLŠTAK P., POLÁČEK M. Štruktúra dát v systémoch hydroinformatiky a ich vzájomné prepojenie. Konferencia Inovatívne informačno-komunikačné technológie vo vodnom hospodárstve, ISBN: 978-80-89535-14-9