This paper is concerned with certain field investigations and model experiments whose purpose was both to discover the mechanism of the movement of coastal material and its deposition m harbor basins and to consider some protective measures which might be taken against the fillmg-up of basins by drifting sand. From view point of similarity for the falling velocity of bottom materials, vinyl pellets were used as the model sediment. In experiments the height of the deposition of sediment was measured, together with the direction and velocity of currents, while m various cases the wave height inside and outside the harbor was measured as a means of elucidating the behavior of drifting sand as it fills up a hart or basin. It is concluded from these experiments that the fillmg-up of a harbor basin can be reproduced quantitatively in a model and that currents induced in basins by waves and harbor oscillations may have an important bearing on the problem of fillmg-up.

/pdf/model-study-on-the-filling-up-of-a-fishery-harbor-bx-2il4rw71t3.pdf

Model study on the filling-up of a fishery harbor bx drifting sand

This paper presents an attempt towards the determination of the geometric distortion for beach mobile bed models. At first, a derivation of a scaling law for modelling equilibrium beach profiles is given, based on Valembois' (1961) work. Further, an experimental verification of some criteria presented in literature for the reproduction of beach profiles in coastal mobile bed models (e.g. Noda, 1971; Yalin, 1971 and Vellinga, 1982) is carried out, leading to a comparison with the criterion developed herewith. Model experiments were undertaken in a two-dimensional wave flume with regular waves in an attempt to verify the validity of the four similarity criteria for the reproduction of beach profiles. For fine sand as model material, the experimental results proved valid the modified criterion based on Valembois (1961), among all criteria used. The use of this similarity criterion showed that the beach profiles were correctly reproduced in the model. The use of cellulose acetate as model material did not give good results, and none of the similarity criteria used were verified. The use of this lightweight material should be avoided for modelling beach processes. Further testing with finer sand is recommended to analyse the influence of the dimensionless fall time parameter (Dean, 1973) and to confirm its use for the prediction of equilibrium beach profiles.

/pdf/experimental-verification-of-similarity-criteria-for-48c1nqmntv.pdf

Experimental verification of similarity criteria for equilibrium beach profiles

Action des courants permanents : rappel des regles de similitude et de leurs applications,. Action de la houle : etat de la question; etudes du Laboratoire National d'Hydraulique permettant de determiner, dans certaines conditions, les vitesses critiques de debut d'entrainement. Action simultanee de la houle et des courants : etude de la compatibilite des conditions de similitude respectives en vue de la predetermination des caracteristiques des modeles reduits. Verification experimentale. The action of permanent currents: a review of similitude laws and their applications. Wave action: present state of the problem; studies performed at the Laboratoire National d'Hydraulique to enable determination of transport threshold speeds under certain conditions. The simultaneous action of waves and currents: investigation of the compatibility of the respective similitude conditions to enable the predetermination of scale model characteristics. Experimental check.

http://www.shf-lhb.org/articles/lhb/pdf/1960/04/lhb1960030.pdf

La similitude des transports de sédiments sous l'action simultanée de la houle et des courants

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La similitude des transports de sédiments sous l'action simultanée de la houle et des courants