本文主要藉由二維數值模式水理模擬，探討筐網群樁之沖刷、淤積現象，研究過程以類似案例之渠道試驗資料為模式測試基礎，包含矩形渠道單側佈置多孔介質及複合渠道洪水平原佈置多孔介質兩個案例，藉由案例測試檢定模式參數設定之合理性與模式之預測能力。並以現況河道模擬為目標，針對模式進行檢定與驗證，模式驗證係利用洪水事件實測流速分佈與數值模擬結果相比較，並針對數值模式之可靠性作一系列的討論，包括：(1)不同流量作用下之河道模擬：進行筐網在不同定量流流量狀態下水理特性探討。(2)丁埧工法河道模擬：進行筐網與河川工程常用之工法，如：丁埧，在水理特性上差異之分析。
研究結果顯示，在筐網不同流量作用下，當水位升高至完全浸沒流況時，流況改變之幅度隨水位流量增高而繼續減低，模擬結果顯示完全浸末時，筐網對流速影響之幅度約為33%左右。丁埧工法之比較顯示，筐網並無丁埧之結構物附近流速梯度集中現象，可減低結構物附近之局部沖刷集中之現象。
關鍵字：筐網、沖刷、淤積、導流

The subject is to discuss the scour and deposit phenomenon of porous cylinder via two-dimensional numerical model simulation according to the experiment datum of the similar cases during the research, including the two cases, one is the porous medium for the oblong single channel arrangement and the other is the porous medium of multi-channel flood plain arrangement. Meanwhile, we check the reasonability and predictive ability of parameters setup of test examination model and via the above tow cases. Besides, we do the verification and examination of the testing model focused on the existing watercourse as target. The model verification is to use and compare the distribution and value simulation of the actual flow speed of the flood cases and discuss the reliability of the value simulation model, including(1). the watercourse simulation under the different flow effect to proceed the study of characteristics of the different quantitative water flow of the porous cylinder,(2)the watercourse simulation of groin engineering method proceeds the analysis of water theory characteristics between the porous cylinder and the usual method of the river engineering such as groin.
Based on the research result for verification and analysis, we find out that the porous cylinder will change the breadth of situation of the flow and the breadth will be reduced continuously with the crease of the flow of the water level when the water level is raised up to immerge the situation of flow completely by the different water flow effect of porous cylinder. Meanwhile, the simulation result shows that the porous cylinder will impact the flow speed and the ratio of impacted breadth is about 33% when it is immerged completely. But, after compared the different engineering methods, it shows that there is no flow of groin structure focused on porous cylinder to decrease the partial scour phenomenon focused on the structure.
Keywords: Porous Cylinder, Scour, Deposit, Conduction current

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