本文關鍵詞：城市景觀水體表觀污染的懸浮顆粒物粒度分布特征研究　出處：《蘇州科技學院》2015年碩士論文　論文類型：學位論文

  更多相關文章： 城市景觀水體 表觀污染 懸浮顆粒物 粒度分布 組分 影響因子

【摘要】：隨著我國經濟的高速發(fā)展,城市地表水體污染加劇,水質下降,絕大多數城市地表水體喪失了作為飲用水水源地的功能,主體功能轉變?yōu)榫坝^功能。由于城市景觀水體自身生態(tài)脆弱性及人類活動的影響,景觀功能亦被嚴重削弱,城市景觀水體表觀污染日趨嚴重。水中懸浮顆粒物是引起城市景觀水體表觀污染最主要的原因,懸浮顆粒物粒度分布決定著水中顆粒物對光的衰減、吸收和散射作用,進而決定著水體的顏色、透明度、真光層深度等水體表觀特征。固懸浮顆粒物粒度分布特征能反映城市景觀水體表觀污染狀況。基于此本研究以蘇州市內城市景觀水體為研究對象,系統(tǒng)分析水中懸浮顆粒物的粒度分布特征與水體表觀污染程度的關系,從懸浮顆粒物粒度角度來解析城市景觀水體表觀污染效應。得出以下結論:(1)不同表觀污染類型城市景觀水體中懸浮顆粒物呈現(xiàn)不同的粒度分布特征。黃色城市景觀水體懸浮顆粒物粒度主要呈單峰分布,具有分選性較好、峰正態(tài)、近對稱的分布特征;綠色城市景觀水體中懸浮顆粒物粒度主要呈多峰分布,具有分選性差、多組分的分布特征。(2)綠色城市景觀水體中懸浮顆粒物對水體表觀敏感的粒級是8~35μm,SPI值、Chl-a濃度與該粒級組分體積分數呈顯著正相關。此粒級組分體積分數增大是綠色水體表觀污染程度加深的粒度結果表征,該組分體積分數增大主要來自于藻含量增加。(3)黃色城市景觀水體中懸浮顆粒物對水體表觀敏感粒級是3.8~16μm和32~64μm,SPI值與敏感粒級組分體積分數關系具有分段性,分段節(jié)點是濁度為45NTU處。濁度小于45NTU時,SPI值與3.8~16μm粒級組分體積分數呈顯著正相關,與32~64μm體積分數呈顯著負相關;當濁度大于等于45NTU時關系相反。懸浮顆粒物含量達到一定程度時,對SPI值產生貢獻的主要是相對大粒級顆粒物。(4)物源因子、環(huán)境因子、外源因子和水動力條件等影響因子的改變,在懸浮顆粒物粒度分布和水體表觀上呈現(xiàn)一致的響應,懸浮顆粒物粒度分布的改變是產生水體表觀污染效應最根本原因。
[Abstract]:With the rapid development of our country's economy, the urban surface water pollution intensifies, the water quality drops, and most of the urban surface water bodies lose their function as the drinking water source. The main body function is transformed into the landscape function. Because of the ecological fragility of the urban landscape water body and the influence of human activities, the landscape function is seriously weakened. The apparent pollution of urban landscape water is becoming more and more serious. Suspended particulate matter in water is the most important cause of surface pollution in urban landscape water. The particle size distribution of suspended particles determines the attenuation of light in water. Absorption and scattering, in turn, determine the color and transparency of the water. The particle size distribution characteristics of solid suspended particles can reflect the apparent pollution of urban landscape water body. Based on this study, the urban landscape water body in Suzhou was taken as the research object. The relationship between the particle size distribution of suspended particles in water and the degree of water surface pollution was analyzed systematically. The apparent pollution effect of urban landscape water body is analyzed from the angle of suspended particle size. The following conclusion is drawn: 1). The particle size distribution of suspended particles in urban landscape water of different apparent pollution types was different. The particle size of yellow urban landscape water was mainly single-peak distribution. It has the characteristics of good sorting, normal peak and nearly symmetrical distribution. The particle size of suspended particles in green urban landscape water is mainly multi-peak distribution, with poor sorting. (2) the apparent sensitivity of suspended particulates in green urban landscape water was 835 渭 m SPI. There was a significant positive correlation between the concentration of Chl-a and the volume fraction of the particle fraction, which was the result of increasing the apparent pollution of green water. The increase of the fraction integral was mainly due to the increase of algae content.) the apparent sensitivity of suspended particulates in yellow urban landscape water was 3.816 渭 m and 32 ~ (64) 渭 m respectively. The relationship between the SPI value and the volume fraction of the sensitive particle is piecewise. The segmental node is at the turbidity of 45NTU and the turbidity is less than 45NTU. The SPI value was positively correlated with the volume fraction of 16 渭 m grains and negatively correlated with the volume fraction of 32 ~ (64) 渭 m. When turbidity is greater than 45NTU, the relationship is opposite. When the content of suspended particles reaches a certain level, the main contribution to the SPI value is relatively large particle size. 4) the source factor and environmental factor. The change of external factors and hydrodynamic conditions showed a consistent response on particle size distribution and water surface. The change of particle size distribution of suspended particles is the most fundamental reason for the effect of water surface pollution.
【學位授予單位】：蘇州科技學院
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X52

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本文編號：1414915