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梯形渠道粗糙係數之研究

Study on Estimation of Roughness Coefficient for Trapezium Channels

摘要


This study investigates the relations of trapezium channels to roughness coefficient. There are three kinds of coarse materials for using to simulate the surfaces of channel. The hydraulic channel test is performed and the roughness coefficients of coarse materials are estimated. Then, the roughness coefficients of multiple channels are obtained by the hydraulic channel test. Finally, the roughness coefficients of multiple channels are estimated by using the slope-area, area-separation, and wet-perimeter equivalence methods, respectively. These results are compared, and the accuracy of roughness coefficients estimated by three methods is analyzed. The proposed method is provided to estimate effectively the roughness coefficient for the multiple trapezium channels. This method can be useful to promote the safety of hydraulic design in ecological engineering. It provides a convenient and effective method for the hydraulic design of multiple ecological channels. The results show that the effect of slope for the roughness coefficient of multiple trapezium channel is larger than that of flow rate. The roughness coefficients of multiple trapezium channels are I > II > III. The roughness coefficient of multiple trapezium channel obtained by the slope-area method agree with that by the area-separation method. However, the roughness coefficient of multiple trapezium channel obtained by the wet-perimeter equivalence method is different with those obtained by the above two methods.

並列摘要


This study investigates the relations of trapezium channels to roughness coefficient. There are three kinds of coarse materials for using to simulate the surfaces of channel. The hydraulic channel test is performed and the roughness coefficients of coarse materials are estimated. Then, the roughness coefficients of multiple channels are obtained by the hydraulic channel test. Finally, the roughness coefficients of multiple channels are estimated by using the slope-area, area-separation, and wet-perimeter equivalence methods, respectively. These results are compared, and the accuracy of roughness coefficients estimated by three methods is analyzed. The proposed method is provided to estimate effectively the roughness coefficient for the multiple trapezium channels. This method can be useful to promote the safety of hydraulic design in ecological engineering. It provides a convenient and effective method for the hydraulic design of multiple ecological channels. The results show that the effect of slope for the roughness coefficient of multiple trapezium channel is larger than that of flow rate. The roughness coefficients of multiple trapezium channels are I > II > III. The roughness coefficient of multiple trapezium channel obtained by the slope-area method agree with that by the area-separation method. However, the roughness coefficient of multiple trapezium channel obtained by the wet-perimeter equivalence method is different with those obtained by the above two methods.

參考文獻


Chow, V. T., “Open-channel Hydraulics,” McGraw-Hill, New York, 1959
Chen, C. L., “Discussions on regression analysis in new slope-area procedure Cheng-Lung Chen,” written Communication, cited by 蔡宇龍, 2001.
Wu, F. C., Shen, H. W., and Chou, Y. J., “Variation of roughness coefficients for unsubmerged and submerged vegetation”, Journal of Hydraulic Engineering, ASCE, Vol. 125, NO. 9, pp. 934-942. July, 1999
吳富春,「渠道坡度與水深對試驗模擬植栽粗糙係數之影響」,八十三年度農業工程研討會,中國農業工程學會,高雄市,137-145,1994。
黃冠榮,渠道水力學,啟學出版社,台南市,1983。

被引用紀錄


黃文岳(2016)。消能砥墩於渠道中之水理現象探討〔碩士論文,中原大學〕。華藝線上圖書館。https://doi.org/10.6840%2fcycu201600053
黃春霖(2014)。三種乾砌石工法於不同流速下淤砂作用之研究〔碩士論文,中原大學〕。華藝線上圖書館。https://doi.org/10.6840%2fcycu201400124
張嫆青(2010)。逆魚鱗砌石工水理特性及填砂作用之研究〔碩士論文,中原大學〕。華藝線上圖書館。https://doi.org/10.6840%2fcycu201000967

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