正挑丁坝附近可溶性危险化学品扩散示踪试验

Tracer experiments on the diffusion of soluble hazardous chemicals around spur-dike at 90°

利用水槽试验台在不同泄漏位置及不同长度丁坝情况下完成可溶性危险化学品泄漏扩散示踪试验,获得泄漏源位置和丁坝长度改变时正挑丁坝周围水流流态及可溶性危险化学品浓度分布特性.通过分析水槽试验数据得到不同条件下丁坝附近水流流态及示踪剂浓度的变化规律:不同试验条件下丁坝下游受到影响的水域范围不同,但丁坝产生的回流区的形态基本相似,而丁坝上游受丁坝影响的水域仅在丁坝附近的一段区域内,故泄漏源的横向位置的改变对回流区内可溶性危险化学品的浓度影响比较大;此外,丁坝长度对回流区范围的大小影响很大,丁坝越长所产生的回流区的范围越大.

Based on the flume tracer experiments of soluble hazardous chemicals in different lengths of non-submerged spur-dikes and different leakage positions, the flow pattern and the concentration distributions of soluble hazardous chemicals around the spur-dike were obtained by analyzing the flow characteristics around the spur-dike and the changed distribution of the concentration. The results show that the areas of the circumfluence zones are different, but they have similar patterns; before the spur-dike, there is only a small area affected by the spur-dike, and the distribution of the concentration is mainly affected by the transverse location of the leakage ; the area of circumfluence zones can be affected by the length of the spur-dike, and the longer the spur-dike is, the more extensive the circumfluenee zone is.