臺灣博碩士論文加值系統

本研究進行直交之非等寬水平渠道實驗，主要探討非等寬時支、主渠直角
相接之分流流況。影響分流流況之因素如下，支、主渠渠寬比，渠底坡度
，支、主渠相接角度，分流轉角處之平滑度等。本實驗控制支、主渠下游
流況，藉以探討於不同流量不同渠寬比之條件下各物理量之變化。經本研
究發現，主渠上游均勻段之主渠下游平面寬與主渠渠寬比隨著主渠下﹑上
游流量比增加而遞增。又主渠上游均勻段與支渠下游均勻段及分流界面處
之斷面水深約略相等。支渠迴流區寬度愈近水面迴流寬度愈大。又因受支
渠迴流區及束流區之影響，當流經支渠時有較大之能量損失，且渠寬比愈
主渠下﹑上游流量比將會影響主渠下游之流速分佈。支、主渠間受到迴流
現象及束流區之作用，而有較大之能量損失；當支、主渠渠寬比變小時，
其能量損失愈大。

Dividing flow are of considerable importance in study of open-
channel. An experimental investigation of the flow structure at
a right angles dividing open-channel flow is presented. The most
comprehensive studies were concerned with backwater
characteristic and energy losses. Most of the investigators have
studied the problem depending on the control condition in the
main channel and thebranch channel. At present , the study of
dividing flow problem restricted thewidth ration of the branch
channel to the main channel 1.0 and 0.5. At thedownstream of the
branch channel, using a pump of 5 hp to pump. Result of this
study indicates that the section L0 and the section L4 has about
equal depth. In the branch channel, the width of circulation
zone is larger at the surface than at the bottom. The energy
loss is large in the branch channel due to circulation.