EXPERIMENTAL STUDIES ON AERATION PERFORMANCE OF HYDRAULIC TUNNEL EXCAVATION
River systems are the major connection between terrestrial and aquatic ecosystem, but large-scale sluice structures may change fiver ecosystems. In order to ensure aquatic biodiversity, we should conduct proper measures to minimize the negative effects induced by the construction and operation of sluice structures. Increasing dissolved oxygen concentration in discharges from sluice structures is one of these measures, which has low cost and high efficiency. Previous studies on aeration capacity of sluice structures were mainly focused on free overflow and discharge under a sluice gate. There are only a few studies on the aeration capacity of middle and hydraulic tunnel excavation in hypolimnion layer of discharge reservoir. Discharge from hypolimnion layer of reservoirs normally has low oxygen level. In order to eliminate its negative effects on downstream ecosystem, experimental studies were conducted using the physical model in Tankeng Hydroelectric Station. The results showed that aeration ratio (E20) was well correlated with Froude number (Fr) and relative water depth of downstream (ht/h); and use of aeration slot improved aeration rate distinctly. Empirical formula under specific conditions was presented to provide references for the design of hydraulic tunnel excavation of hydraulic structures.
sluice structure aeration ecological environment dissolved ozygen
Haifei Sha Lili Fan Shiqiang Wu Hui Zhou Huiling Chen
Nanjing Hydraulic Research Institute, Nanjing 210029, China State Key Laboratory of Hydrology-Water Hohai University, Nanjing 210098, China Nanjing Hydraulic Research Institute, Nanjing 210029, China
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
646-650
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）