南宁青秀山蜡烛湾水系水动力与水质效应模拟研究

发布时间：2018-03-02 06:00

  本文关键词： 风景园林 蜡烛湾 流场模拟 水动力模拟 水质模拟　出处：《中南林业科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：蜡烛湾是广西省南宁市青秀山水系的重要组成部分,对青秀山水系的流场和水质有着重要的影响。为了蜡烛湾水系的合理布局形态和水质效应,本文根据不同的入口流量、水体形态等方面进行实验设计,运用水动力模型对其进行流场与水质模拟,探讨不同实验方案下水体的流场和水质情况,其结果如下：流场方面,主要结果如下：(1)将蜡烛湾入口1的原始流量分别提高到原来的2倍、3倍、4倍、10倍进行水动力实验来探究不同流量下对蜡烛湾流场的影响。实验结果表明：当湖区流量为2.4m3/s时,湖区流场情况最为理想,当当湖区流场形态为6m-/s时,整个湖区流场形态最不合理。(2)根据不同流量的流场实验对水体形态(边界和岛屿)进行调整进行流场实验。实验结果表明：改变水体形态后,整个湖区流场得到较大提升。水质方面,主要结果如下：(1)在流场实验基础上对不同流量条件的水体进行水质实验,实验结果表明：当入口流量为2.4m-/s时,湖区整体TN、TP均维持在较低水平,其他各项指标均能达到Ⅲ类水质要求,湖区发生较大规模水华风险较低,为最适流量。当入口流量为0.6m3/s、1.2m3/s、1.8m3/s时,叶绿素a、TP、TN浓度局部过高,基本达到Ⅲ类水质要求,水体边界处容易形成死水。当流量为6m3/s时,叶绿素a、TP、TN浓度过高,极容易形成大面积水华现象。(2)在流场实验基础上对改变边界形态条件的水体进行水质实验,实验结果表明：改变水体边界条件下的湖区整体TN、TP均维持在较低水平,其他各项指标均能达到Ⅲ类水质要求,湖区发生较大规模水华风险较低。通过分析,得出结论如下：(1)通过改变流量,可以在一定程度上改变整个水域的流场分布情况,并可以根据此探究不同工况下水体流速是否适合植物生长。(2)改变水体形态所得到的流场情况比较理想,通过对比两种水体形态,得出结论：每一种水体形态下,都有与之适应的流量条件,使蜡烛湾湖区的流场和水质达到最佳。(3)不同流场形态下,通过改变园区流量与水体形态可以改变湖区水质状况。(4)在本次实验中,确定相对合理出入水流量为2.4m3/s时,考虑调水1.8m3/s的流量,可改善蜡烛湾的水质条件,大约0.03m/s流速适合藻类植物生长,并且可以使湖区整体维持优良水质。
[Abstract]:Candao Bay is an important part of Qingxiu Mountain water system in Nanning City, Guangxi Province, which has an important influence on the flow field and water quality of Qingxiu Shan River system. The flow field and water quality were simulated by hydrodynamic model, and the water flow field and water quality under different experimental schemes were discussed. The results are as follows: flow field, water quality and water quality. The main results are as follows: (1) the original flow rate at the inlet of Candle Bay is increased to 2 times, 3 times, 4 times and 10 times, respectively. Hydrodynamic experiments are carried out to study the effect of different flow rates on the flow field of the Bay Candle. The experimental results show that when the flow rate in the lake region is 2.4 m3 / s, The flow field in the lake area is the most ideal, when the pattern of the flow field in the lake area is 6 m / s, The flow field of the whole lake region is the most unreasonable. (2) according to the flow field experiment of different flow rate, the flow field experiment is carried out to adjust the water body shape (boundary and island). The experimental results show that: after changing the water form, The main results are as follows: 1) on the basis of the flow field experiment, the water quality of different discharge conditions is tested. The experimental results show that when the inlet discharge is 2.4 m / s, The total TNT TP in the lake area was maintained at a low level, and the other indexes could meet the requirements of class 鈪，

本文编号：1555281