臺灣博碩士論文加值系統

本試驗研究旨在探討不同型式溢流口所形成之水流狀況對防砂壩下沖刷坑之影響。據觀察，水流局部碰撞所引起的消能作用與水流分流所產生的水舌厚度及水舌流向的改變，均對沖刷坑內最大平衡沖刷深度有顯著的影響。

The experimental research is about the effect of the various over crest flow upon the scour hole below a labyrinth check dam. According to what was observed in the laboratory, the bumping of cross flow, the change of mappe thickness and the direction of flow due to the diversion of the flow all bear noticeable influence on the maximum equilibrium scour depth of the scour hole.

符號說明……………………..………………………….………..I
中文摘要………………………………….……………………….II
英文摘要………………….………….……………………...…III
圖目錄…………………………...….………..……...….....IV
表目錄……………………………….………….………………..VI
附圖目錄………………………………………….…………....VII
附表目錄………………………………..…………...…….....IX
壹、前言…………………………………………………….…….1
貳、文獻回顧……………………………………………….…….3
參、因次分析……………………………………………….…….6
肆、水工試驗……………………………………………….…….9
4-1 試驗目的………….…………………………….………………...9
4-2 試驗設備與操作…….…………………………….……………...9
(一)試驗流槽……………………………………………….…………..9
(二)渡槽……………………………………………………..…………11
(三)量測儀器………………………………………………....………11
(四)防砂壩與溢流口模型…………….………………….………....11
(五)試驗用河床質……………………………………………….…...14
(六)試驗流量…………………………………………………….…...15
(七)尾水控制………………………………………………………....16
(八)試驗操作程序………………………………………………....…16
伍、結果分析與討論………………………………….……………...18
5-1 水工試驗結果……………………..….……………….………..18
5-2 試驗結果之探討……………………...……………….……....18
(一)試驗流量對最大平衡沖刷深度之影響………………………....18
(二)最大跌緣水深對最大平衡沖刷深度之影響…………..………..20
(三)通水斷面積對最大平衡沖刷深度之影響………………..……..21
(四)射流平均流速對最大平衡沖刷深度之影響…………………....23
(五)溢流口總長對最大平衡沖刷深度之影響………….…….......24
(六)溢流口夾角對最大平衡沖刷深度之影響…………..……......26
5-3無因次參數對最大平衡沖刷深度之影響……………………...…28
陸、結論與建議……………………………………………….……...40
6-1 結論………………………………………………………...…...40
6-2 建議………………………………………………………...…...41
柒、參考文獻………………………………………….………….…..42

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