Ivan Mincev, Ivan Blinkov, Aleksandar Trendafilov


Erosion and filling of reservoirs with sediment is one of the main problems leading to reduced lifespan of the
reservoir with large environmental and economic implications. Reservoir sedimentation also provides valuable information
on erosion intensity and sediment transport within a drainage basin and it can serve as the outlet of a giant erosion
plot. With the invention of the global navigation satellite system (GNSS), the bathymetric measurements of the
sediment in the reservoirs became much easier. Measurements performed with GNSS-supported echosounder are completed
much faster and with considerable accuracy. The subject of this study is the Kalimanci reservoir. The reservoir
was built in 1969 and until the present there have been 13 measurements, and gathered data is of great service for examination
of the rates of deposition. It can be inferred that two mayor deposition periods exist, with braking point in the
mid-80s. In the first period, the average annual deposition in the reservoir was 493,055 m3 / year, and in the second period
the average annual deposition in the reservoir was 214.325 m3 / year, i.e. the deposition rate has reduced more than
double between the two periods.


water reservoir; sediment transport; bathymetry; soil erosion; lifespan

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