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Effects of Atmospheric Nitrogen Deposition on Beili Lake in Hangzhou

Author: LiTaiQian
Tutor: JiaoFeng
School: Suzhou Institute of Technology
Course: Environmental Engineering
Keywords: Dry deposition Wet deposition Nitrogen deposition North Lake
CLC: X524
Type: Master's thesis
Year: 2011
Downloads: 75
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Abstract


In order to study the the exogenous urban landscape lake's pollution, the paper on atmospheric nitrogen deposition North Lake West Lake in Hangzhou. The main content of the paper is to study the variation of the influencing factors of atmospheric nitrogen and nitrogen deposition of each month, and further analysis of the contribution of each month of atmospheric nitrogen deposition on North Lake. The research results show that different locations around North Lake NO x concentration are quite different, mainly motor vehicles caused by local pollution. The wind direction also affects the atmosphere around North Lake NO x concentration, the wind blowing from the city will improve atmosphere of NO x concentration. Precipitation NO x scouring precipitation and precipitation time. Hangzhou surrounding farmland in each wind direction will affect the North Lake around NH 4 -N concentration due to North Lake in the south of the city, southerly to North Lake NH 4 -N greater impact. Urban blowing north wind Lake TSP average concentration higher than the concentration in the mountain wind. 2010 Hangzhou precipitation each month for April, May and November, are very rich. The wet sedimentation TN 95.5% TDN. Wet deposition TN concentrations were negatively correlated with precipitation, and TN deposition fluxes and precipitation were positively correlated. The Wet settlement in NH 4 -N concentration and flux are much higher than NO 3 - -N. The Dry Deposition TN, 82% TDN. TN dry deposition fluxes are mainly influenced by the wind direction and wind direction, the type and concentration of nitrogen atmosphere. Dry settlement in NH 4 -N flux is much higher than NO 3 - -N. The total settlement the TDN in TN average content of 90.1%, wet deposition is the main settlement in TN. Total settlement main factor is the the precipitation, NH 4 -N TN main ingredient. Settlement NH 4 -N concentration lake NH 4 -N concentration contribution is relatively large, more than 50% of . The settlement of NO 3 - -N concentration accounted for in the summer the lake of NO 3 - -N concentration of more than 10%. TN sedimentation concentration variation of the lake TN concentration variation In contrast, the contribution of atmospheric deposition on the lake TN concentration, Kitasato can reach more than 10%. Atmospheric nitrogen deposition in the summer is an important source of North Lake TN.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control > Lakes and reservoirs
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