摘要
引清调水是近年湖泊水质改善常用的方法,其中调水模式对改善效益有直接影响。以玉环湖水质改善工程为例,研究了引排同步和预排后引两种模式对湖区水质改善的效果。引排同步模式下通过方案比选侧重研究引水流量以及引配点对引水效果的影响,预排后引模式则研究了不同的预排水量对引水效果的影响。研究结果表明,引水前期污染物浓度变化速率最为显著,随着引水时间的持续变化速率变缓;污染物浓度的变化及最终值与引流流量、引水总量呈现负相关。引排同步模式污染物浓度变化曲线分为急速下降段、平衡段和稳定段,预排后引模式污染物浓度变化曲线则表现为急速下降段和缓慢下降段;总体而言预排后引模式改善效益更好。在引清调水的方案中不同组分污染物的改善效果有差别,总氮、氨氮的改善效果较好,化学需氧量的改善效果较差。研究成果可为湖区引调水方案设计提供技术参考。
Water diversion is one of the commonly methods in the process of water quality improvement while the dispatch pattern has a direct impact on improvement. Taking the water quality improvement project of Yuhuan Lake as an example, this paper studied the im- provement effect of two patterns. The pattern of water diversion synchronized with drainge focused on the improvement of diversion dis- charge and diversion distribution. The pattern of drainge advanced water diversion focused on the improvement of drainge volume. The results showed that the most obvious change occurred in the early period of diversion process and the change rates got slower in the fol- lowing period. Pollutant concentration changes showed negative relation with diversion discharge and total diversion water volume. The pattern of water diversion synchronized with drainge had three obvious phases including rapid change phase, balancing phase and steady phase. The pattern of drainge advanced water diversion had rapid change phase and slow change phase. Totally, the improvement of drainge advanced water diversion pattern was better than the other pattern. The improvement of different pollutants were different. The improvement of TN and NH3 - N was better than other pollutants. The study results could provide technical reference for the diversion scheme option.
出处
《人民珠江》
2017年第8期91-95,共5页
Pearl River
关键词
浅水湖泊
水质改善
调度模式
评价指标
数值模拟
shallow lake
water quality improvement
diversion pattern
assessing indicator
numerical simulation
