On the Interactions of Waves and Fluidized Cohesionless Sea Bed

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Project title

Code/計畫編號

NSC89-2611-E019-026

Translated Name/計畫中文名

波浪與液化非凝聚性海床之交互作用

Project Coordinator/計畫主持人

Shiaw-Yih Tzang

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

歐善惠

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=492968

Year

2000

Start date/計畫起

01-08-1999

Expected Completion/計畫迄

31-07-2000

Bugetid/研究經費

895千元

ResearchField/研究領域

土木水利工程

本文選擇一細砂質 (D50 = 0.069 mm) 土壤作為試驗海床材料於斷面水槽中進行一系列造波試驗，探討規則波浪作用下細砂質海床土壤液化反應特性與其懸浮漂砂濃度之關連性。試驗時於近海床上架設一支光學式濃度計量取懸浮漂砂濃度，並於其下海床內部設 5 支孔隙水壓計同步量測土壤之反應。孔隙水壓試驗結果顯示有非液化、起始液化及連續液化三種類型發生。同步之懸浮漂砂量測結果顯示，往往在海床土壤產生液化後近底床處懸浮漂砂濃度方才明顯上升，且從同一回合連續數試次之造波作用結果發現海床上方懸浮漂砂濃度值在起始液化反應時最大，且隨著其後連續液化反應所達深度減少其最大上升值亦逐漸降低，而非液化反應發生之試次，懸浮漂砂濃度均相當微小。In this paper a fine sandy soil (D50 = 0.069 mm) was utilized as test seabed material for investigate the links between internal soil fluidization response and the near bed suspended sediment concentrations under monochromatic wave actions. In the experimental tests, an optical concentration probe near above bed and 5 pressure transducers were deployed for simultaneous measurements of both quantities. The pore pressure measurements were analyzed to display three typical responses termed as unfluidized, initially fluidized and continuously fluidized, respectively. The measurements of suspended sediment concentration show that the values used to increase significantly short after seabed is fluidized. For all the runs in the same test, maximum suspended sediment concentration was used to be highest in the initially fluidized runs and became smaller in consecutive fluidized runs. Essentially, only very low suspended sediment concentrations are detected in the unfluidized response.

Keyword(s)

波浪
液化海床
懸浮漂沙
群波特性
孔隙水壓
Waves
Fluidized seabed
Suspended sediment
Wave groupiness factor Pore pressure

DSpace CRIS

On the Interactions of Waves and Fluidized Cohesionless Sea Bed

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