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Ráckeve-branch of river Danube (HU)


Geographical location: Danube branch on the east side of Csepel Island, south of Budapest.

Type of waterway: Branch of Danube river closed by two locks on the northern and southern ends. The locks were built between 1910 and 1926. Since that time water flow in the river branch is very low, close to still water.

Contamination type and problem: heavy metals in deeper layers of the sludge. The Csepel Island is moderately populated area. In the 20th century significant heavy industry was characteristic of the Csepel Island – in addition to a military airport. However, these activities caused during the last decade. As both ends of the Ráckeve-branch are closed by locks, industrial pollution could easily accumulate in the sludge of the practically steady water. Recent analyses confirmed that the heavy metal concentration was significant, mainly in the deeper layers of the sludge at the southern edge of the island. Csepel Island nowadays serves as residential and recreational area. The Hungarian Water Management Authorities have decided to remove the polluted sludge from the Ráckeve-branch and revitalize the area.

Typical water depth: 2-3 m (in the surveyed area, more to the south)

Water conductivity: 390 μS/cm

Surveys performed: GPR/Seismic

Pictures:

 
 

 

 

 

 

   
Seismic profile   Survey boat
Location map   Seismic and GPR profiles
Sludge bottom   Sludge thickness

 

 

 

Survey boat in operation

 

 

Typical seismic profile recorded

 

 

 

 

Comparison of seismic and GPR profiles

 

Survey basemap

Thickness of the sludge layer

 

 

Bottom of the sludge layer