MEASURING DEPOSED SEDIMENT IN SMALL RESERVOIRS, CASE STUDY: GRADOCE RESERVOIR
Journal
The Journal "Agriculture and Forestry"
Date Issued
2015-06-30
Author(s)
DOI
10.17707/agricultforest.61.2.19
Abstract
Reservoir sedimentation is a serious consequence of soil erosion with large
environmental and economic implications. On the other hand, reservoir
sedimentation also provides valuable information on erosion intensity and
sediment transport within a drainage basin. A reservoir can be considered as a
large scale experiment, as the outlet of a giant erosion plot. With the application
of the global navigation satellite system (GNSS), the bathymetric measurements
of the sediment in the reservoirs became much easier. The measurements done
with GNSS supported echosounder are completed much faster with considerable
accuracy. Because the time needed for the measurements is much shorter then
besides the measurements of the established profiles also some additional
measurements can be done. Namely this new method gives the opportunity for
total measurement of the reservoirs on profiles and contour measurement. The
case study was done on the reservoir “Gradče” which is a small reservoir with
total storage of 1.8 106 m3.The reservoir siltation was measured twice (1984 and
1991) while the latest measurement was done in 2013 with echo-sounder with
GPS support. Then the total deposited sediment was calculated and the
deposition rates were calculated. It was concluded that until 1984 the deposition
rate was 2.5 time higher than the later period (1984-2013).The used measuring
method, combination of contour and cross-profile measurement, showed
promising results.
environmental and economic implications. On the other hand, reservoir
sedimentation also provides valuable information on erosion intensity and
sediment transport within a drainage basin. A reservoir can be considered as a
large scale experiment, as the outlet of a giant erosion plot. With the application
of the global navigation satellite system (GNSS), the bathymetric measurements
of the sediment in the reservoirs became much easier. The measurements done
with GNSS supported echosounder are completed much faster with considerable
accuracy. Because the time needed for the measurements is much shorter then
besides the measurements of the established profiles also some additional
measurements can be done. Namely this new method gives the opportunity for
total measurement of the reservoirs on profiles and contour measurement. The
case study was done on the reservoir “Gradče” which is a small reservoir with
total storage of 1.8 106 m3.The reservoir siltation was measured twice (1984 and
1991) while the latest measurement was done in 2013 with echo-sounder with
GPS support. Then the total deposited sediment was calculated and the
deposition rates were calculated. It was concluded that until 1984 the deposition
rate was 2.5 time higher than the later period (1984-2013).The used measuring
method, combination of contour and cross-profile measurement, showed
promising results.
Subjects
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