基于MIKE21的小南海湖补水方案效果分析
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摘要
人类开发活动导致湖泊污染严重,生态功能严重退化,研究补水改善湖泊水质对于维持湖泊生态系统健康意义重大。针对小南海湖COD、TN浓度较高的水环境现状,应用MIKE 21软件建立小南海湖二维水动力水质模型,分析5个补水方案对湖泊水环境质量改善的效果。结果表明,截断倒虹管污水入湖后,湖泊水位下降0.7 m,必须同步实施补水工程;湖泊补水8个月后,湖泊水质开始明显改善;单从新河引水时,小南海湖心COD浓度降至29 mg/L,TN浓度降至19 mg/L,改善效果显著,从松西河补水对湖泊水质的改善效果较新河补水差,因此,考虑水质改善效果,建议从新河引水补给小南海湖。
The lake is heavily polluted and its ecological functions are severely degraded by human development activities. It is of great significance to study the improvement of lake water quality by supplementing water for the maintenance of lake ecosystem health. Aiming at the present situation of water environment with high concentration of COD and TN in Xiaonanhai Lake, a two-dimensional hydrodynamic water quality model of Xiaonanhai Lake is established by using MIKE 21 software, and the effects of five water supplement schemes on improving the water quality of Xiaonanhai Lake are analyzed. The results show that the water level of the lake decreases by 0.7 m after the cut-off of the inverted siphon sewage into the lake, and the water quality of the lake begins to improve significantly after 8 months of water supplement. When the lake is diverted from the Xinhe River alone, the concentration of COD and TN in the the center of Xiaonanhai lake decreases to 29 mg/L and 19 mg/L respectively. Thus,the improvement effect is remarkable. However, after replenishment from the Songxi River,the improvement effect on water quality is worse than that of Xinhe River. Therefore, considering the improvement effect of water quality, it is suggested to divert water from Xinhe River to supply Xiaonanhai Lake.
The lake is heavily polluted and its ecological functions are severely degraded by human development activities. It is of great significance to study the improvement of lake water quality by supplementing water for the maintenance of lake ecosystem health. Aiming at the present situation of water environment with high concentration of COD and TN in Xiaonanhai Lake, a two-dimensional hydrodynamic water quality model of Xiaonanhai Lake is established by using MIKE 21 software, and the effects of five water supplement schemes on improving the water quality of Xiaonanhai Lake are analyzed. The results show that the water level of the lake decreases by 0.7 m after the cut-off of the inverted siphon sewage into the lake, and the water quality of the lake begins to improve significantly after 8 months of water supplement. When the lake is diverted from the Xinhe River alone, the concentration of COD and TN in the the center of Xiaonanhai lake decreases to 29 mg/L and 19 mg/L respectively. Thus,the improvement effect is remarkable. However, after replenishment from the Songxi River,the improvement effect on water quality is worse than that of Xinhe River. Therefore, considering the improvement effect of water quality, it is suggested to divert water from Xinhe River to supply Xiaonanhai Lake.
引文
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[2] WANG Y G,ZHANG W S,ZHAO Y X,et al.Modelling water quality and quantity with the influence of inter-basin water diversion projects and cascade reservoirs in the Middle-lower Hanjiang River[J].Journal of Hydrology,2016,541:1348-1362.
[3] 杨卓,彭继伟.城市浅水湖泊治理技术初探[J].环境科学与管理,2016,41(7):105-108.
[4] 邹朝望,孙媛媛.城市浅水湖泊水质水量联合调度研究[J].三峡生态环境监测,2017,2(3):25-34.
[5] 胡琪勇.滇中引水工程对滇池草海水质改善效果预测与评价[D].昆明:昆明理工大学,2017.
[6] 路洪波,黄宁,王润娟.基于MIKE 21的城市湖泊人工水循环的浓度场数值模拟[J].陕西水利,2018(3):111-113.
[7] 吴庆,纪道斌,黄亚男,等.基于水质改善的枝江金湖水系连通方案研究[J].水利水电快报,2018,39(3):14-25.
[8] 杨卫,张利平,李宗礼,等.基于水环境改善的城市湖泊群河湖连通方案研究[J].地理学报,2018,73(1):115-128.
[9] 许婷.MIKE 21 HD计算原理及应用实例[J].港工技术,2010,47(5):1-5.
[10] 王领元.应用MIKE对河流一、二维的数值模拟[D].大连:大连理工大学,2007.
[11] 郁片红.基于MIKE 21水动力模型的琵琶湖内循环方案[J].净水技术,2018,37(7):108-113.