RESEARCHES ON BEHAVIOUR OF REGULATION WORKS LOCATED IN MORPHOLOGICALLY UNSTABLE RIVER BEDS

Abstract

The paper deals with the behavior of geotextile regulation works on the dynamic action of floods in erodable river beds. Geotextiles have become an important component in the structure of river bed regulation and shore protection works. The dynamic action of floods, through liquid and solid flows, influences the stability and the resistance in time of geotextile constructions. The studies and researches were carried out on a sector of Moldova River between Soci and Pildeşti localities, on the territory of Iaşi and Neamţ counties. The researchers analysed the behavior of geo-bagss made of polyester bags filled with local materials (generally sand and gravel) used for bottom sills, routing dikes and shore protection elements. The research results indicate a differentiated behavior of geo-bagss according to their location (in water or on shore) and water action (dynamic or static). Water dynamic action has caused significant degradation of geo-bagss from bottom sills and routing dikes structures located in the river bed. Geo-bagss have low resistance to the alluvial material action (stone, trees) transported in the river bed during floods. The research highlighted the proper behavior of geo-bagss during the river bed erosion phenomenon, when they moved and ensured the continuity of the bottom sills and their performance.

Keywords

• bottom sill
• geo-bags
• geotextile
• hydrodynamic erosion