摘要
为解决黄河潼关河段射流清淤工程有关技术问题,分析其冲沙效果,利用室内水槽进行了静水、动水条件下射流冲刷试验.试验采用容重为 0 021 5N/cm3、孔隙率为 0 61的粉煤灰. 根据水槽试验研究,提出了能较好反映不同粘性床沙的射流冲刷坑尺寸的射流能力指标F0 60 (d/D)-0 19,并建立了冲刷坑尺寸与F0 60 (d/D)-0 19的关系;同时在潼关河段进行了现场试验,研究了喷嘴距床面的最优高度,提出喷嘴距床面的最优高度在 0 7m左右.并初步分析了潼关河段的射流冲刷效果,射流冲刷后,含沙量明显增加;通过 5年的清淤实践,平均每年射流清淤可使潼关高程在汛期降低 0 15m左右.
To solve related dredging problems and to analyze the effectiveness of jet flow scouring for the Tongguan stretch of the Yellow River, jet flow scouring experiments were made in laboratory flumes. A specific sort of fly ash with a density of (0. 0215N/cm^3) and porosity of 0. 61 was used for testing. The data gathered from tests properly reflected the performance of different cohesive bed material, thus furnishing the index of jet scouring capacity for the dimensions of scour hole. F^( 0.6)_0(d/D)^(-0.19) and establishing the relationship between the dimensions of scour hole and F^( ()()0.6)_0(d/D)^(-0.19) .By field experiments, the optimal height of a nozzle from the surface of river bed was considered to be approximately 0. 7m. The jet flow scouring on Tonghuan stretch had indicated a better effectiveness with significantly increased sediment concentration of the water. The five year dredging practice at Tongguan showed a reduced Tongguan elevation of about 0. 15m during flood season every year.
出处
《水利水电技术》
CSCD
北大核心
2004年第12期19-22,共4页
Water Resources and Hydropower Engineering
关键词
潼关河段
射流清淤
冲刷试验
黄河
冲刷坑
床沙
潼关高程
容重
床面
高度
index of jet flow scouring
dimensions of scour hole
optimal height for nozzle
jet flow dredging effectiveness
Yellow River
