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Problems of rational use of the geological environment of the sea shelf zone

Problèmes posés par la prise en compte rationnelle de l'environnement géologique dans les zones côtières

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Summary

The vast socpe of man's engineering activity at the seaside notably affects the natural geological environment of the shelf zone and modifies the dynamics of natural processes, this frequently may cause damage to the national economy.

Investigations conducted at the Caucasian Black Seaside and shelf revealed that the protection and rational development of the geological environment involve scientifically well-founded arrangement of harbours and coastprotecting structures within the sea littoral, which is stabilized by alongshore drift originating as a rule at the major rivers' outfalls. In young geosyncline seas, above 80 per cent of beachforming material account for river drift. Therefore, another essential point concerns the study of the effect of the river run-off control upon the sea coast stability Outfall improvement, dam construction on mountain rivers lead to a reduction of the solid run-off alimenting longshore drift and, consequently, to a drift deficite within the littoral zone and to coastal erosion. Thus they have to be permanently taken into account.

Résumé

Les activités de l'homme dans les régions côtières affectent notablement l'environnement géologique du plateau continental et modifient la dynamique des phénomènes naturels, ce qui provoque fréquemment des dégâts préjudiciables à l'économie nationale.

Les études menées sur la côte de la Mer Noire et sur la plateforme continentale ont montré que la protection et le développement rationnel de l'environnement géologique supposent que la construction des ports et des ouvrages côtiers de protection soit menée scientifiquement, en tenant compte du fait que le littoral a atteint un équilibre naturel grâce aux dépôts qui se répandent généralement à partir de l'embouchure des cours d'eau importants. Dans les mers subsidentes, plus de 80 pour cent des matériaux côtiers proviennent des apports fluviatiles Il est donc important d'étudier l'effet des débits solides des rivières sur la stabilité des côtes. L'aménagement des embouchures, la construction de barrages en amont conduisent à une réduction du débit solide et en conséquence à un déficit en matériaux dans la zone littorale et à une érosion côtière. Il faut done en tenir compte en permanence.

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Authors and Affiliations

  1. Hydrogeology and Engineering Geology, Academy of Sciences of the Georgian SSR, USSR

    J. M. Buachidze (Sector) & K. I. Djandjgava (Sector)

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  1. J. M. Buachidze
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  2. K. I. Djandjgava
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Buachidze, J.M., Djandjgava, K.I. Problems of rational use of the geological environment of the sea shelf zone. Bulletin of the International Association of Engineering Geology 31, 35–37 (1985). https://doi.org/10.1007/BF02594745

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