本文關(guān)鍵詞： 風(fēng)景園林 蠟燭灣 流場模擬 水動力模擬 水質(zhì)模擬　出處：《中南林業(yè)科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：蠟燭灣是廣西省南寧市青秀山水系的重要組成部分,對青秀山水系的流場和水質(zhì)有著重要的影響。為了蠟燭灣水系的合理布局形態(tài)和水質(zhì)效應(yīng),本文根據(jù)不同的入口流量、水體形態(tài)等方面進(jìn)行實驗設(shè)計,運用水動力模型對其進(jìn)行流場與水質(zhì)模擬,探討不同實驗方案下水體的流場和水質(zhì)情況,其結(jié)果如下：流場方面,主要結(jié)果如下：(1)將蠟燭灣入口1的原始流量分別提高到原來的2倍、3倍、4倍、10倍進(jìn)行水動力實驗來探究不同流量下對蠟燭灣流場的影響。實驗結(jié)果表明：當(dāng)湖區(qū)流量為2.4m3/s時,湖區(qū)流場情況最為理想,當(dāng)當(dāng)湖區(qū)流場形態(tài)為6m-/s時,整個湖區(qū)流場形態(tài)最不合理。(2)根據(jù)不同流量的流場實驗對水體形態(tài)(邊界和島嶼)進(jìn)行調(diào)整進(jìn)行流場實驗。實驗結(jié)果表明：改變水體形態(tài)后,整個湖區(qū)流場得到較大提升。水質(zhì)方面,主要結(jié)果如下：(1)在流場實驗基礎(chǔ)上對不同流量條件的水體進(jìn)行水質(zhì)實驗,實驗結(jié)果表明：當(dāng)入口流量為2.4m-/s時,湖區(qū)整體TN、TP均維持在較低水平,其他各項指標(biāo)均能達(dá)到Ⅲ類水質(zhì)要求,湖區(qū)發(fā)生較大規(guī)模水華風(fēng)險較低,為最適流量。當(dāng)入口流量為0.6m3/s、1.2m3/s、1.8m3/s時,葉綠素a、TP、TN濃度局部過高,基本達(dá)到Ⅲ類水質(zhì)要求,水體邊界處容易形成死水。當(dāng)流量為6m3/s時,葉綠素a、TP、TN濃度過高,極容易形成大面積水華現(xiàn)象。(2)在流場實驗基礎(chǔ)上對改變邊界形態(tài)條件的水體進(jìn)行水質(zhì)實驗,實驗結(jié)果表明：改變水體邊界條件下的湖區(qū)整體TN、TP均維持在較低水平,其他各項指標(biāo)均能達(dá)到Ⅲ類水質(zhì)要求,湖區(qū)發(fā)生較大規(guī)模水華風(fēng)險較低。通過分析,得出結(jié)論如下：(1)通過改變流量,可以在一定程度上改變整個水域的流場分布情況,并可以根據(jù)此探究不同工況下水體流速是否適合植物生長。(2)改變水體形態(tài)所得到的流場情況比較理想,通過對比兩種水體形態(tài),得出結(jié)論：每一種水體形態(tài)下,都有與之適應(yīng)的流量條件,使蠟燭灣湖區(qū)的流場和水質(zhì)達(dá)到最佳。(3)不同流場形態(tài)下,通過改變園區(qū)流量與水體形態(tài)可以改變湖區(qū)水質(zhì)狀況。(4)在本次實驗中,確定相對合理出入水流量為2.4m3/s時,考慮調(diào)水1.8m3/s的流量,可改善蠟燭灣的水質(zhì)條件,大約0.03m/s流速適合藻類植物生長,并且可以使湖區(qū)整體維持優(yōu)良水質(zhì)。
[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，

本文編號：1555281