發(fā)布時(shí)間：2019-05-29 16:00

【摘要】：研究區(qū)域地處太湖西岸,是太湖流域上游的主要匯水區(qū),近年來(lái),隨著市內(nèi)工業(yè)化和城市化的發(fā)展,工業(yè)污水和城市生活污水排放日趨增加,這些污水通過(guò)市內(nèi)主要河網(wǎng)流入太湖,從而導(dǎo)致了太湖水污染問(wèn)題的加劇。本文以入太湖河流水質(zhì)提升為目標(biāo),從現(xiàn)場(chǎng)調(diào)研和數(shù)值模擬兩個(gè)方面分析市區(qū)水體水質(zhì)污染現(xiàn)狀和污染物遷移規(guī)律,研究研究區(qū)域水體流動(dòng)特性。首先,在2013年10月與2015年4月對(duì)整個(gè)太湖流域進(jìn)行了水質(zhì)現(xiàn)狀調(diào)查,以上游溧陽(yáng)入境河段為起點(diǎn),入太湖河段為終點(diǎn),沿湖水域設(shè)置29個(gè)監(jiān)測(cè)點(diǎn),測(cè)定高錳酸鉀指數(shù)、總磷、總氮、氨氮4項(xiàng)水質(zhì)指標(biāo)濃度,實(shí)驗(yàn)結(jié)果表明:不同采樣點(diǎn)間高錳酸鉀指數(shù)含量差距較小,其余指標(biāo)變化幅度較大,其中,高錳酸鉀指數(shù)為4.96~6.08mg/L,總磷值為0.11~0.32mg/L,氨氮值為0.57~1.84mg/L,總氮值為2.21~4.45mg/L。根據(jù)地表水環(huán)境質(zhì)量評(píng)價(jià)標(biāo)準(zhǔn),29個(gè)測(cè)點(diǎn)高錳酸鉀指數(shù)達(dá)到III類水標(biāo)準(zhǔn),總磷值含量基本介于IV類、V類之間,氨氮值含量介于IV類、V類之間,部分測(cè)點(diǎn)達(dá)到劣V類,總氮值含量超出V類水標(biāo)準(zhǔn),污染比較嚴(yán)重。此次測(cè)定指標(biāo)濃度中,城區(qū)處測(cè)點(diǎn)總磷值最高,入境段測(cè)點(diǎn)氨氮值、總磷值最高。其次,應(yīng)用現(xiàn)有水環(huán)境模擬軟件MIKE3建立西l?l?流域垂向積分二維水動(dòng)力數(shù)值模型,模擬研究西l?流域夏季環(huán)流的形態(tài)特點(diǎn)和形成原因。計(jì)算結(jié)果顯示:風(fēng)是形成夏季環(huán)流的主要因素;在均勻定常風(fēng)以及地形效應(yīng)的共同作用下,使得西l?流場(chǎng)具有淺水順風(fēng),深水逆風(fēng)的分布特點(diǎn);即使是在平底地形下,只要風(fēng)驅(qū)動(dòng)力足夠大,在科氏力作用下也會(huì)有環(huán)流形成。
[Abstract]:The study area is located on the west bank of Taihu Lake and is the main catchment area in the upper reaches of Taihu Lake Basin. In recent years, with the development of industrialization and urbanization in the city, the discharge of industrial sewage and urban domestic sewage is increasing day by day. These sewage flow into Taihu Lake through the main river network in the city, which leads to the aggravation of water pollution problem in Taihu Lake. In this paper, the water quality improvement of Taihu Lake is taken as the goal, the present situation of water quality pollution and the law of pollutant transport in urban area are analyzed from two aspects of field investigation and numerical simulation, and the regional water flow characteristics are studied. First of all, the present situation of water quality in the whole Taihu Lake Basin was investigated in October 2013 and April 2015. taking the upper Liyang reach as the starting point and the Taihu Lake reach as the end point, 29 monitoring points were set up along the lake waters to determine the potassium permanganate index and total phosphorus. The experimental results show that the difference of potassium permanganate index content among different sampling points is small, and the change range of other indexes is large, among which the potassium permanganate index is 4.96 脳 6.08 mg 路L, and the potassium permanganate index is 4.96 脳 6.08 mg 路L ~ (- 1), and the potassium permanganate index is 4.96 脳 6.08 mg 路L ~ (- 1). The total phosphorus value was 0.11 鈮，

本文編號(hào)：2488042