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Research
Task 22: River Tisza Basin
 
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Upper_Tisza_Breach.jpg Supporting_ribs_Tiszasuly.jpg Sand_boiling_Tiszasas.jpg Pulling_down_houses_April2000.jpg Szolnok_2000.JPG Zagyva_híd_2000.png
Task Leader: Péter Bakonyi
Organisation: Water Resources Research Centre
Click for factsheets about FLOODsite outputs relevant to Task 22

Contents:




Research objectives Back to top

The pilot study focused on the following issues:

  • Developing precautionary and sustainable flood management strategies for the river basin, based on the investigation and analysis of previous floods;

  • Fostering international co-operation especially in the fields of monitoring, data exchange and methods of flood forecasting and warning; and

  • Applying general vulnerability analysis techniques (using flood hazard mapping) developed by other FLOODsite tasks, to identify the effectiveness of flood management strategies.

This pilot drew on a wide range of FLOODsite Task outcomes:

 
Research outputs Back to top

The five research outputs of the pilot study were:

  1. FLOODsite report T22-07-01 “River capacity improvement and partial floodplain reactivation along the Middle-Tisza – Scenario Analysis” by Sándor Tóth et al.

  2. FLOODsite report T22-07-02 “Analysis of effects of pollution due to flooding” by Wolf von Tümpling.

  3. FLOODsite report T22-07-03 “Scenario Analysis – The impact of extreme precipitation patterns” by Balázs Gauzer et al.

  4. FLOODsite report T22-08-03 “Vulnerability analysis in the Körös-corner flood areas along the Middle-Tisza River” by Sándor Tóth et al.

  5. FLOODsite report T22-09-02 “The development the basin wide system of flood warning” by Péter Bartha et al.

All of these reports can be accessed via the Publications Available Online button at the top of this page.

Principal Results Back to top

Increasing flood conveyance capacity

The creation and maintenance of a hydraulic corridor (by relocation of levees and the removal of obstacles) would have a positive effect and could achieve a 1 to 1.5 m decrease in extreme flood levels (if combined with partial floodplain reactivation and flood detention).

Further information can be found here.

Partial floodplain reactivation with controlled inundation

Partial floodplain reactivation and flood detention would have a positive effect and could achieve a 1 to 1.5 m decrease in extreme flood levels (if combined with modifications to the hydraulic corridor).

Further information can be found here.

Effects of pollution due to flooding

  • The contamination level of the sediments has decreased since the spills in the River Szamos (a tributary of the Tisza).

  • High potential mobility of toxic elements was found.

  • Repeated contamination threatens the use of the floodplain creating a risk to agriculture.

Information regarding sources, monitoring and transfer of contaminants can be found here.

Extreme precipitation patterns

  • Antecedent precipitation and the water content of the snow cover are both more important to flood peaks along the Tisza River than previously accepted.

  • The amount of run-off generated is very sensitive to the path of the frontal zones; minor deviations in geographical location of the precipitation field can produce extreme floods.

  • The most dangerous situations for the lower Hungarian Tisza reach are precipitation events on the Upper-Tisza followed 8-10 days later by precipitation on the Körös-Maros catchment.

Further information on precipitation impact analysis can be found here.

A basin wide integrated system of monitoring, flood forecasting and warning

Although there are many automated hydro-meteorological stations in the Tisza Basin, communication between the data collection centres (whether locally or across state borders) could still be improved to enable information to be transferred in time for use in forecasts.  Therefore, a web-based database is proposed and a draft version has been prepared.

Vulnerability analysis

The vulnerability analysis developed in Task 9, Task 10 and Task 11 was applied in one of the Tisza flood cells (Körös corner) to identify the effectiveness of flood management strategies.  The following approach was undertaken:

  • Production of a flood hazard map of the Körös corner, indicating the distribution of flood depth.

  • Determination of the spatial extents of land use categories and the distribution of the value of assets at risk in the Körös corner flood area (mean estimation).

  • Development of relative damage functions.

  • Calculation of the distribution of flood event damages for three different scenarios: the 200-year, 100-year and 50-year return periods (0.5%, 1.0% and 2.0% annual probability).

  • Calculation of the annual average damage.

  • Documentation of uncertainties.

Examples of results for the Körös corner are shown below.

Flood hazard map of the Körös corner for the 200-year return period flood (Click for larger view) Damages for the 100-year flood event in the Körös corner (mean estimation) (Click for a larger view)
Flood hazard map of the Körös corner for the
200-year return period flood (Click for larger view)

Damages for the 100-year flood event
in the Körös corner (mean estimation)
(Click for a larger view)

 
 
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