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Reaeration of Oxygen in Shallow, Macrophyte Rich Streams: I – Determination of the Reaeration Rate Coefficient
Author(s) -
Thyssen Niels,
Erlandsen Mogens,
Jeppesen Erik,
Ursin Christian
Publication year - 1987
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19870720403
Subject(s) - macrophyte , aeration , tracer , streams , oxygen , environmental science , chemistry , hydrology (agriculture) , biomass (ecology) , environmental chemistry , ecology , geology , computer network , physics , geotechnical engineering , organic chemistry , computer science , nuclear physics , biology
The rate coefficient K 2 for the exchange of oxygen between flowing water and the atmosphere (reaeration) has been studied in six Danish streams covering a relatively wide range of hydraulic conditions, pollutional loading, and macrophyte abundance. 103 K 2 ‐measurements were performed in 1978–85. 82 measurements were obtained applying 5 different indirect methods all balancing the sources and sinks of stream dissolved oxygen under conditions of normal operation of the system (3 methods) and under artificial depletion of the oxygen concentration of the stream water by addition of sodium sulphite (2 methods). 21 K 2 ‐values were determined directly applying a gaseous tracer (krypton‐85) for reaeration. Guidelines for selecting a proper method to determine K 2 knowing macrophyte biomass and loading characteristics of the particular stream are provided.