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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Batumi coastal protection: facing decreasing river discharges of gravel and
Batumi coastal protection: facing decreasing river discharges of gravel and
Author : MARIA DI LEO(1), ALESSIO GIARDINO(2), GIULIA BRAGANTINI(3), HANS.DEVROEG(4) & PIETER-KOEN TONNON(5)
ABSTRACT
The beaches of Batumi coast are formed by gravel sediment carried by the Chorokhi River. Two submarine canyons
stretch from the far depths to Batumi coast: one reaches Batumi Cape in the north, the other one lies directly opposite
the mouth of river Chorokhi in the south. Previous studies have shown that part of the pebbles from the river flow into
this canyon, hence failing to feed the beaches downdrift. Furthermore human interventions on the river (sediment
mining, water flow regulation) have reduced in time the amount of sediment available to the beach, and further reduction
is expected due to planned construction of new dams along the river. As a result the beach is suffering erosion in the
southern stretch.
In addition, geotechnical instability processes have been identified involving the canyon in the Northern area of Batumi
coast. Here two different instabilities coexist: the main instability process, which led to a massive landslide observed in
1999, and a secondary instability process, which is independent from to the main one and involves smaller soil volumes.
Both these processes can be related to the high sedimentation rate in the area From a geotechnical point of view,
especially with reference to the main landslide, the reduction in the sedimentation rate or better its halt could prevent any
further instability phenomenon.
The design process, developed with support of Deltares, has gone through different steps. At first, dominant natural
mechanisms governing the transport of beach material and acting upon the coast of Batumi have been identified and
quantified. Secondly, different design options have been evaluated considering the development of different coastal
functions, both based on a technical and cost-benefit analysis. State-of-the-art numerical models have been used
extensively in the study of the reference situation and in the evaluation of the different options.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 18/08/2015
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