High-resolution profiles of temperature and dissolved oxygen in a river

Steele J.G. (1989) High-resolution profiles of temperature and dissolved oxygen in a river. Hydrobiologia, 179 1: 17-24. doi:10.1007/BF00011926


Author Steele J.G.
Title High-resolution profiles of temperature and dissolved oxygen in a river
Journal name Hydrobiologia   Check publisher's open access policy
ISSN 0018-8158
Publication date 1989
Sub-type Article (original research)
DOI 10.1007/BF00011926
Volume 179
Issue 1
Start page 17
End page 24
Total pages 8
Publisher Kluwer Academic Publishers
Subject 2312 Water Science and Technology
2310 Pollution
2300 Environmental Science
1910 Oceanography
1104 Complementary and Alternative Medicine
Abstract Longitudinal profiles of water quality along a well-mixed tidal river are, ideally, based on simultaneous measurements at fixed stations distributed along the river. The resolution of the profiles is limited by the density of the stations. However, for a given number of stations the resolution is greatly increased if water quality date can be extrapolated upstream and downstream of the stations, making use of velocity data; the resolution is then determined by the density of the extrapolated data points, which may be an order of magnitude higher than the density of the stations. A 15-km length of river was investigated using 5 current meters equipped to measure depth, temperature, conductivity and dissolved oxygen. Data were recorded simultaneously every 10 minutes. When the average cross-sectional speed was 0.25 ms-1 (typical of tidal conditions), the extrapolated data points were 150 m apart, so the resolution of the resulting profiles (7 per kilometre) was much higher than that of the stations alone (0.3 per kilometre). The extrapolation process required a means of deducing the average cross-sectional speed from the speed measured at a given station. The key to this was provided by temperature data recorded during the onset of a spate, when tidal flow was suspended and the average cross-sectional speed was uniformly about 0.75 ms -1 at four of the stations. Profiles of temperature and dissolved oxygen were generated by this method; the resolution was about 2 data points km-1 during the onset of the spate, and 6 points km-1 during tidal flow.
Keyword monitoring
oxygen
profiles
resolution
spate
temperature
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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