Wave-Induced Instability in Cohesionless Seabeds and Their Interactions (III)

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基本資料

Project title

Code/計畫編號

NSC88-2611-E019-026

Translated Name/計畫中文名

海岸空間利用第六子題---「海域地形變遷」---波浪引起之非凝聚性海床不穩定現象與其交互作用---懸浮漂沙濃度分布研究(III)

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=463243

Year

1999

Start date/計畫起

01-08-1998

Expected Completion/計畫迄

31-07-1999

Bugetid/研究經費

392千元

ResearchField/研究領域

海洋科學

本報告是海工學門海岸空間利用第六整合型計畫「海域地形變遷」之一三年期子計畫之總結報告,研究範圍是針對沙質海床在波浪作用下之孔隙水壓反應,將之歸納並進而提供實驗時海床表面之懸浮飄沙之觀察結果。主要執行方式是採二維造波水槽試驗配合理論驗證。試驗用土壤採用中值粒徑d50分別為0.085mm及0.125mm之沙土,其反應特性歸納為三類。研究分析指出沙質土壤之反應與沈泥有許多不同,特別是在液化反應機制與孔隙水壓之消散能力,但兩者在液化後土壤有明顯之懸浮漂沙發生則有一致之結果。 This report summarizes the three-year experimental studies on mechanism of wave-induced seabed instability for one of the subprojects of the Coordination Project entitled "Geomorphologic Changes in Marine Areas". It is found from 2-D wave flume tests on two sandy seabeds (d50=0.085mm and 0.125mm) that under wave loading the sand responses can be classified into three categories based on pore pressure built-ups. The characteristics of the fluidized responses in sands are much different from those in silts, especially no resonance mechanism is clearly identified in sands. However, significant sediment suspensions are similarly observed in fluidized tests as were on previous fluidized silt tests.

Keyword(s)

懸浮漂砂濃度
海床不穩定性
波浪
Suspended sediment density
Seabed instability
Wave

DSpace CRIS

Wave-Induced Instability in Cohesionless Seabeds and Their Interactions (III)

基本資料

Description