頁籤選單縮合
題名 | 箱式涵洞控制長度及流型分界之研究=A Study on Distinction between Flow Types and Control Length for Box Culverts |
---|---|
作者 | 顏榮甫; 蔡長泰; 林志翰; | 書刊名 | 技術學刊 |
卷期 | 15:4 2000.12[民89.12] |
頁次 | 頁545-553 |
分類號 | 442.1 |
關鍵詞 | 控制長度; 水力長短箱式涵洞; 水躍; Culvert control length; Hydraulically short and long box; Hydraulic jump; |
語文 | 中文(Chinese) |
中文摘要 | 涵洞水理現象因上、下游水位之不同而有管流、閘流、堰流等不同之流動型態。本文依據轉換處應具流量連續性之條件及水躍理論,得出自由堰流與閘流、閘流與自由管流之流型分界,並建立涵洞各流型間之完整分界圖,且由水面剖線演算推求閘流型涵洞中脈縮水深發展至涵洞垂高之水平長度,進而推知水力長箱式涵洞所需之控制長度。 為探討上述兩類流動型態由理論推得之分界及無因次超臨界涵洞長度曲線之正確性,本文設計下射式閘門水工試驗。試驗結果與理論尚頗一致。顯示本文所得之箱式涵洞控制長度之標準及各流型分界可作為公路涵洞設計時,選用涵洞流量公式之參考。 |
英文摘要 | Pipe flow, gate flow, and weir flow, presenting diverse flow patterns are culvert hydraulic phenomena resulting from different levels of headwater and tailwater. This study is based on the condition of flow continuity at transition point and hydraulic jump theory, to establish the division between free weir flow and gate flow, gate flow and free pipe flow, and furthermore to establish a complete distinguishing diagram among various flow types. Through computation of flow profiles, we delivered the length of the culvert, while the water depth of vena contrata was developed to the culvert height, then concluded the control length of a hydraulically long box culvert. In order to verify the accuracy of theoretical conclusions for divisions between two-phase flow of culvert and non-dimensional culvert length curves, a hydraulic model with sluice gate was used in this study. The results of the experiment are in good agreement with the conclusions. This shows that the criteria of control length and distinction between flow types for box culvers derived from this study, can be considered as reference while choosing the appropriate culver flow formula for the culvert design of the highway. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。