Experimental Study for the Dependence of Wave-moved Sediment on Grain Size

• Main Authors: Yan-Hua Chen, 陳彥樺
• Other Authors: Chung-Pan Lee
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/15809123713513606879

碩士 === 國立中山大學 === 海洋環境及工程學系研究所 === 99 === In the study, the thickness of wave moved-sediment layers was measured under regular wave conditions as well as the initial slope of sea bed with grain size of medium diameter 0.237mm and 0.128mm. The initial bottom slope ( tanα) is 1/45, and nineteen wave conditions were studied. For each case, we analyzed the results after about 28800 waves were made. Sands are similar density and grain size but different colors. After wave action, the clear boundary between the two layers (two different colors) of sands will be mixed into gray color by wave-induced vortex.According to unmoved-layer(white) and gray-layer to get the total wave-moved sediment quantity. Finally, we get the relationship between the wave-moved sediment quantity per wave( q) and two parameters( εb and Θb ) which were established by Liao (2005, doctorate draft). The grain size does not affect εb , and we get the q= 6.486*10^-5*εb . The relationships between and ： 0.110mm gets q=5.103*10^-6Θb , 0.128mm gets q=1.139*10^-5*Θb, and 0.237mm gets q=1.933*10^-5*Θb .