摘要
含丁坝河流中水流流速、水位高度及河道底坡比等水力条件的变化会对丁坝周围水体中污染扩散过程产生较大影响。通过一系列改变水流流速、水位高度及水槽底坡比等水力条件的水槽试验,获得不同水力条件下丁坝附近水流流动特性及示踪剂质量浓度分布的变化规律:水流流速增大时,丁坝下游回流区的范围会变小但变化并不明显;水位升高时丁坝下游回流区范围仅随水位升高而变深,回流区长度和宽度没有明显变化;水槽底坡比改变对回流区范围的大小影响比较大,水槽底坡比越大丁坝所产生的回流区的范围也越变大。
The flow velocity, water depth and the slope of river bed have a strong impact on the distribution of pollutants in the river with spur-dikes. A series of clear-water flume tracer experiments are made through changing hydraulic conditions including flow ve- locity, water depth and the slope of river bed. The flow characteristics around the 90 spur-dike and the concentration distribution of the tracer are obtained. The results show that the water velocity has little influence on the cireumfluence zones and the circumfluence zones expand only in depth with the increase in water depth. However, the area of circumfluence zones can be impacted by the slope of river bed greatly, and the sharper the slope of river bed is, the more extensive the circumfluence zones are.
出处
《中国农村水利水电》
北大核心
2009年第6期132-136,共5页
China Rural Water and Hydropower
基金
国家“十一五”科技支撑计划课题资助(2006BAK01B03)
关键词
丁坝
示踪试验
水流流速
水位高度
底坡比
spur-dike
tracer test
water velocity
water depth
the slope of river bed
