Author(s)

Shun-Chung Tsung, Jihn-Sung Lai, Yun-Ling Chen, Hau-Wei Wang

Taiwan Typhoon and Flood Research Institute, National Applied Research Laboratories, Taipei City.

Hydraulic structure is designed based on hydraulic theories or guidelines. To ensure performance, physical model tests are often used at high discharges. However, high discharge in river is rare. Physical model tests at high discharges will probably lead biased hydrological relationship. To improve hydrological relationship at low discharges, in this study, we considered the diversion rating curve of the Yuanshanzi Diversion Work. The 1/100-scaled physical model tests at low and high discharges (90 - 1620 m³/s) were performed and coupled the diversion discharges of 5 flood events (2009-2010) in field. The official diversion rating curve was built only based on physical model tests at high discharges (837 - 1620 m³/s). The results of physical model tests in this study suggested the official diversion rating curve should be modified considering all tests. The modifications showed the official diversion rating curve was over-estimated. A complete series of physical model tests and considering field situations, in this study, indicated expanded physical model tests and constantly field measurements were therefore necessary for hydraulic structure, which provided information to modify used hydrological relationship to fit real situations.

Physical Model Test, Yuanshanzi Diversion Work, Rating Curve

Tsung, S. , Lai, J. , Chen, Y. and Wang, H. (2015) Rating Curve Modification at Low Discharges Using Physical Model Tests. World Journal of Engineering and Technology, 3, 50-56. doi: 10.4236/wjet.2015.32005.