植生護岸梯形渠道水理特性之研究

Study on the Hydraulic Properties of Vegetated-revetment Trapezoid Channel

楊紹洋(Shaw-Yang Yang) ； 謝家倫(Jia-Lun Shie)

《農業工程學報》 54卷2期 (2008/06) Pp. 52-59

https://doi.org/10.29974/JTAE.200806.0005

摘要

近年来，生态工程運用於農田水利工程，常採用粗糙表面、孔隙透水或植生等護岸，多樣性護岸和渠道，以符合水域環境之生態性。本研究以梯形渠道爲題，攷慮渠道側坡和植生等條件上，進行渠槽試驗設計，分析植物梯形渠道之水理特性。研究結果顯示，相同渠道從坡下，護岸曼寧係數(n(下標 w)隨著流量增加而增大：相同流量下，護岸(n(下標 w)值隨著渠道從坡增加而漸減。由試驗數據線性回歸分析得，護岸(n(下標 w)值和渠道n值與福祿數(N(下標 F)之關系函數分別爲(n(下標 w)=-0.0136(N(下標 F^2)+0.0016(N(下標 F)+0.0616和n=8.5169(n(下標 w^2)+0.10752(n(下標 w)+0.0064。考慮水流特性：水深(h)、平均流速(V)、流量(Q)、流量(ρ)、黏滯力(μ)及重力加速度(g)等：渠道特性：渠底寬(B1)、渠面寬(B2)及渠道從坡(S)等，利用多元回歸分析得，植生梯形渠道和護岸等粗糙係數的關係函數分別爲n=(B1/h)^2431(B2/h)^(-45614)(S)^0.0184(Q/Vh^2)^0.8305(μ/pVh)^0.1275(V.√gh)^0.1649和n(下標 w)=(B1/h)3.0116(B2/h)^(-5.0952)(S)^0.0196(Q/Vh^2)^0.9810(μ/pVh)0.0968(V.√gh)^(-0.2141)。此研究成果在工程實務應用上，植生梯形渠道粗糙係數模式的建立，有助於生態工程設計之引用。

關鍵字

生態工程 ； 渠槽試驗 ； 水理特性 ； 曼寧係數 ； 植生護岸

並列摘要

In die recent years, the ecological engineering used on the irrigation engineering, a revetment with coarse surface, permeable pores, or vegetation, and a diverse combination of channel are often adopted to conform to the ecology of water areas. This research concerns with the trapezoid channel and considers the slope and vegetation of the revetment, and does the according channel test and analyzes the hydraulic properties. Manning's coefficient of revetment (n(subscript w) increases with increasing flux at the same slope of channel and with decreasing the slope of channel at the same flux. Applying a linear regression analysis, the relational functions of Manning's coefficient and the Froude number (N(subscript F)) are n(subscript w)=-0.0136N(subscript F^2)+0.0016 N(subscript F)+0.0616 for the revetment and n=-0.0031 N(subscript F)-0.016 N(subscript F)+0.0512 for the channel. From the regression analysis of Manning's coefficients of n and n(subscript w) one can obtain n=8.5169n(subscript w^2)+0.10752n(subscript w)+0.0064. The relational functions of Manning's coefficient and dimensionless hydraulic parameters can be obtained by using the multiple regression analysis the are n=(B1/h)^2.4231(B2/h)^(-4.5614)(S)^0.0184×(Q/Vh^2)^0.8303(μ/pVh)^0.1275(V/√gh)^(-0.1619)and n(subscript w)= (B1/h)^3.0116(B2/h)^(-5.0952(S)^0.0196×(Q/Vh^2)^0.9819(μ/pVh)^0.0968(V/√gh)^(-0.2141). In the engineering practical applications, the results of the roughness coefficient model are helpful to he utilized on the design of ecological engineering.

並列關鍵字

Ecological engineering ； Channel test ； Hydraulic property ； Manning's coefficient ； Vegetated revetment