aspects of studying the sedimentations in reservoirs
the natural experiments
Matchavariani1*, G. Metreveli2, L. Lagidze3,
Z. Gulashvili4, D. Svanadze4 and N. Paichadze3
1Department of Soil
Geography, Faculty of Exact and Natural Sciences, Tbilisi State University,
0179, Tbilisi, Georgia
Applied Ecology, Faculty of Exact & Natural Sciences, Tbilisi State
University, 0179, Tbilisi, Georgia
Nature Management Geography, Faculty of Exact & Natural Sciences, Tbilisi
State University, 0179, Georgia
Hydrology, Oceanology and Meteorology, Faculty of Exact and Natural Sciences,
Tbilisi State University, 0179, Tbilisi, Georgia
Author E-mail: firstname.lastname@example.org
Paper received : 25.10.2016
Revised received : 24.06.2017
Accepted : 28.06.2017
Aim: The process of the
sediment accumulation in reservoirs stops after the silting prism is formed
on the body of equilibrium bed, by means of which the river can transport a
full range of sediment downstream. Presently, there is no approved method for
forecasting the parameters of the silting prism and the equilibrium bed. In
order to study the process of the silting prism formation and the equilibrium
channel forecasting the field experiments were carried out on small mountain
rivers of Georgia.
of the natural experiment implementation was created. For the analysis of the
obtained results the methods of mathematical statistics and differential
calculus were applied.
experiments showed that equilibrium bed is formed much higher than the
initial position of the riverbed causing a serious threat of catastrophic
inundation in case of flood. It was found that final result of the reservoir
silting is an accumulative terrace, where an equilibrium channel is produced.
Length of the train is a function of the maximum flow discharge, the deposit
of runoff, diameter of bottom sediment and initial inclination of riverbed.
Fractional distribution of the sediments into silting prism is determined by
the type of the reservoir regulation and the intra-annual distribution of the
Interpretation: The mechanism of
riverside destruction by water flow is considered as a random process, which
depends on both the effect of flow rate and riverside stability.
Vulnerability, the characteristic of the riverside is taken as the indicator
of this process with respect to such influence, and famous model “load –
stability” from the theory of reliability is used for its identification.