頁籤選單縮合
題名 | 水流流經植生坡面之流速分析=Velocity Analysis of a Flow Passing over a Vegetated Slope |
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作者姓名(中文) | 唐靖雅; 謝平城; | 書刊名 | 中華水土保持學報 |
卷期 | 44:3 2013.09[民102.09] |
頁次 | 頁234-244 |
分類號 | 434.273 |
關鍵詞 | Biot孔彈性介質理論; 植生水流; 流速分佈; Biot's theory of poro-elasticity; Vegetation flow; Velocity distribution; |
語文 | 中文(Chinese) |
中文摘要 | 一般坡地上除了草地以外,尚有木本植物,因此模擬植生坡面上之薄層流(或稱為漫地流),需同時探討種植木本植物與草本植物之植生坡面,本研究依水深將流場劃分為兩層或三層,分別為植生層、土層兩層,或木本層、植生層和土層三層。木本層之控制方程式是以Navier-Stokes方程式加上木本植物對水流造成的阻力來描述;植生層與土層之控制方程式則以Biot孔彈性介質理論為基礎,依不同的植生狀態加以修正、無因次化和以半解析的方式針對垂直流速分佈進行求解。 |
英文摘要 | A sheet flow or overland flow is simulated by the theory of laminar flow passing over a grassed slope with wood. The flow region is divided into two layers (vegetation layer & soil layer) or three layers (wood layer, vegetation layer & soil layer) according to the water depth. The Navier-Stokes equations are employed to govern the flow in the wood layer, and the Biot's theory of poro-elasticity is applied to delineate the flow in the vegetation and soil layers. These equations are simplified, modified and nondimensionalized under different vegetation situations, and then solved analytically. As a result, the velocity distributions are derived by a semi-analytical approach to understand the flow mechanism. |
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