Wavelet Analysis of CODMn and NH3-N in Panzhihua, Upper Yangtze River

DOI

10.2991/rsete.2013.209How to use a DOI?

Keywords

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Abstract

The 1-D continuous wavelet transform of Morlet was used to investigate the characteristics of water quality at Longdong monitoring station, upper Yangtze River of Panzhihua. The consistence of CODMn and NH3-N were chosen as main monitoring indicators, produced by Longdong monitoring station by weekly monitoring from 2004 to 2010. The result shows that consistence of CODMn changes between -8 and 8 with roughly 42 weeks mainly cycle, 10 weeks and 21 weeks for the second cycle. Consistence of NH3-N changes between -0.3 and 0.3, and the largest value appears on 5th week of 2004, a larger value at 35th, 70th and 110th weeks. Except the mentioned weeks above consistence of NH3-N changes smoothly. There is a small fluctuation from 1 to 15 weeks at the curve of NH3-N consistence wavelet coefficient variance, and a relatively large fluctuation in 15-50 weeks, while after that that curve showing a rising trend. Overall, CODMn changes by rainfall while NH3-N by agricultural production habits. In wet season, soil erosion was strengthened with much more mud and sand draining to the river, resulting in a declining of water quality.

Copyright

© 2013, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Chengyan Dong
AU  - Mingliang Luo
AU  - Ying Zhang
PY  - 2013/08
DA  - 2013/08
TI  - Wavelet Analysis of CODMn and NH3-N in Panzhihua, Upper Yangtze River
BT  - Proceedings of the 2013 the International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE 2013)
PB  - Atlantis Press
SP  - 862
EP  - 866
SN  - 1951-6851
UR  - https://doi.org/10.2991/rsete.2013.209
DO  - 10.2991/rsete.2013.209
ID  - Dong2013/08
ER  -