Keywords: Accretion, Currents, Detached breakwater, Hydraulic model 



(three-dimensional). Littoral transport. Movable bed, Tombolo, 

 Wave attenuation 



The article discusses experimental data for a harbor where offshore 

 dikes and training levees are combined to counteract filling of the harbor 

 entrance on a coast with longshore littoral transport. Included is an 

 experimental study of the possibility of preventing filling of the harbor 

 entrance through use of different harbor shapes , 



153, SATO, S.I.I. , and HORIE, T., "Study of Coastal Erosion of Inner 

 Bay," Report No. 28, Studies of the Erosion on the Coast of Toyama 

 Bay 3 Reports of Cooperative Research for Disaster Prevention, 

 National Research Center for Disaster Prevention, Japan, Feb. 1972, 

 pp. 87-112 (in Japanese). 



Keywords: Accretion, Currents, Detached breakwater, Hydraulic model 



(three-dimensional), Japan (Toyama Bay), Littoral transport, 

 Movable bed. Sand tracer study. Sediment gradations 



Field observations and model experiments were conducted to clarify 



the characteristics of erosion in Toyama Bay, one of the most ero"ded 



coasts in Japan. Some count ermeasures for preventing coastal erosion 

 are offered. 



The results from observations of longshore current by floats and 

 of longshore drift by fluorescent tracers, topographic survey, sediment 

 analysis, nearshore scour measurements, and model experiments (in both 

 fixed and movable beds) are given. The characteristics of coastal ero- 

 sion in Toyama Bay were found to be well associated with the irregular 

 distributions of waves and longshore currents due to topographical com- 

 plexities. 



154. SAUVAGE DE SAINT MARC, M.G., and VINCENT, M.G. , "Transport Littoral 

 Formation de Fleches et de Tombolos" (Littoral Drift Formation of 

 Spits and Tombolos) , Proceedings of the Fifth Conference on Coastal 

 Engineering 3 American Society of Civil Engineers, 1954, pp. 296-328. 



KeipJords : Currents, Detached breakwater. Hydraulic model (three- 

 dimensional). Littoral transport. Movable bed, Tombolo 



This paper is devoted to the study of phenomena connected with the 

 evolution of sandbanks (littoral spits and tombolos) . These formations 

 are of interest to the engineer responsible for the construction of ports 

 on sandy coasts. 



An attempt was made to determine the influence on littoral drift of 

 such factors as: wave characteristics, wave steepness, the inclination 

 of the wave crests breaking on the beach, and the nature of the beach 

 material. The formation of certain types of tombolos found in nature is 

 also described. 



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