本文以八掌溪軍輝站、義竹站為研究對象，取1972年至1981年實測之較大流量各項水力性質，應用應用非線性阻力關係式法、Einstein and Barbarossa法及Engelund法等平均流速公式，分析觀測資料之福祿數、D/ds及能量坡降之關係，探討適合於該水文站河段之公式。軍輝站屬礫石質底床，觀測範圍內， 值大多在0.06以下，不會有河床形態發生，經各種流速公式之比較分析，軍輝站之平均流速公式以Einstein and Barbarossa公式為宜。義竹站為砂質底床，可有河床形態發生，因而Einstein and Barbarossa法及Engelund法均可適用，且Engelund公式應可顯示流速與水深關係間不連續變化；另由計算繪圖可看出各觀測流量，其能量坡度分佈甚廣，不易明確決定，應建立輔助水位站，以量測較為可靠之水面坡度。

　　This paper is a study based on two stations at the Pa-Chang Chi called Chun Huei Station and Yi Chu Station. This study consists of taking data from the period of 1972-1981, using the hydraulic characteristic of the largest discharge of water. The methods used were nonlinear resistance relationship approach, Einstein and Barbarossa method, and Engelund method. The average velocity of these methods is used to analyze the data looking at the relationship of Froude number、D/dsand the energy slope. This study is attempts to find the suitable formula for this river section. The bed of river of Chun Huei Station consists of gravel. This study shows most of the value of are under 0.06 which means the bed form will not exist. After analyzing the calculation’s graphics, the average velocity formula for the Chun Huei Station are Einstein and Barbarossa method found to be more suitable. The bed of river of Yi Chu Station consists of sand. Therefore, the bed form will exist. The Einstein and Barbaroosa and Engelund Formula are suitable methods to use. The Engelund formula shows the difference of the irregular velocity and depth of the river. The calculation’s graphics show the range of energy slope to be wide. It is not easy to deside definitely. Therefore, we should build an assistant station at upstream and downstream in order to measure the slope of the water.

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