Paper Information

Journal:   IRANIAN JOURNAL OF MARINE TECHNOLOGY   SPRING 2017 , Volume 4 , Number 1 #F0063; Page(s) 64 To 74.
 
Paper: 

EVALUATION OF SANDY BED RIPPLES GEOMETRY USING PHYSICAL MODEL AND CORRECTING EXISTED PRACTICAL RELATIONS FACTORS

 
Author(s):  DAGHIGH HAMIDEH, KARAMI KHANIKI ALI, ALIAKBARI BIDOKHTI ABAS ALI
 
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Abstract: 

In this study, we have evaluated generation and development of sandy bed ripples under controlled wave conditions using physical modeling.
Experiments of this study have been done in experimental flume of Soil Conservation and Watershed Management Research Institute (SCWMRI). Wave flume has 20m length, 5.5m width and 2m height that have been separated to three sections by two walls. Our model has been setup in 3 parts with different slopes of 0.01, 0.02 and 0.03.
Physical simulation tests were carried out in two different series to investigate the bed changes during the time(in 4 runs) as well as the effects of different heights and periods of waves on ripples (in 8 runs). Results showed that increasing in wave height and period will caused increase of ripples height and wave length. Also increase of wave heights, will caused more amounts of transported sediments. As well as, bed ripples will be become more asymmetrical with increasing in wave period.
we suggested relations for predicting ripple's dimension less height and wavelength by using physical model data together with a large existent set of experimental and field data. Calculating statistical indexes shows these relations have more precious in predicting ripples geometry towards existed relations.

 
Keyword(s): BED FORM, EXPERIMENTAL MODEL, RIPPLE, WAVES
 
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