Experimental analysis of Flow characteristics at Hydrologic stations of the Tseng-Wen River
碩士 === 國立成功大學 === 水利及海洋工程學系專班 === 101 === Flows in river play a crucial role in hydrologic circulation, so the flow variations in dry and wet seasons are even more important in hydrologic observation. Without reliable and accurate flow observation data as basic parameters, neither engineering planni...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2013
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/78106027939523279765 |
| Summary: | 碩士 === 國立成功大學 === 水利及海洋工程學系專班 === 101 === Flows in river play a crucial role in hydrologic circulation, so the flow variations in dry and wet seasons are even more important in hydrologic observation. Without reliable and accurate flow observation data as basic parameters, neither engineering planning and design and management and regulation of water resources for hydraulic engineering projects nor academic researches in ecological conservation and water pollution control can conduct their analytic works. This paper investigates the correlation between surface velocity and averaged velocity of an actual river course with field observation, experiment and analysis which mean improved method of observation and analysis of measured data. The investigation results are used to provide feasible advices for swift measurement of averaged channel flow velocities in typhoon and torrential rain. The reduction of measurement time will improve the safety of observers under bad weather.
The field observation and analysis choose five stream gauging stations in midstream and downstream of Tsengwen river as experimental sites to analyze the correlations between their surface velocities and averaged velocities. The correlations derived with field experiments provide the operational reference for field workers. The ratio of surface velocity to averaged velocity of each stream gauging station is derived by analyzing measured data with linear regression: the ratio of Hsin-Chung(1) station is 0.83; the ratio of Er-Si station is 0.75; the ratio of Zho-Jhang station is 0.85; the ratio of Yu-Ten station is 0.81; the ratio of Yu-Feng station is 0.80. The measured cross-section water depth shows that channel level decreases during flood recession. Volume method is used to examine the bottom samples of all five stations. A suggestion of the roughness length ks of Tseng-Wen River is ks=D30. It’s estimated that the roughness length ks of each station: the roughness length ks of Hsin-Chung(1) station is 1.83mm; the roughness length ks of Zho-Jhang station is 0.022mm; the roughness length ks of Yu-Ten station is 0.007mm; the roughness length ks of Yu-Feng station is 86.41mm; the roughness length ks of Er-Si station is 1.23mm.
|
|---|