Document Detail

River Water Quality Model no. 1 (RWQM1): case study II. Oxygen and nitrogen conversion processes in the River Glatt (Switzerland).
MedLine Citation:
PMID:  11379156     Owner:  NLM     Status:  MEDLINE    
Various simplifications of the river water quality model no. 1 are applied to data sets from the river Glatt in Switzerland. In a first application, the biomass responsible for nitrogen and oxygen conversion processes is quantified based on known reaeration rates, measured concentrations of ammonia, nitrite and oxygen and assumed growth parameters of algae and bacteria. In a second application, the model is extended to calculate chemical equilibria of inorganic carbon compounds dissolved in the water and daily variations in pH. The influence of partially unknown inflow concentrations and of calcite precipitation on fluctuations in electrical conductivity and pH are discussed. In the last model, the processes of growth of sessile algae and bacteria, detachment of algae, and grazing by benthic organisms are introduced. Due to lack of data for quantifying these processes, this last model application is speculative. Nevertheless, it is interesting because it shows a direction to which river water quality modelling would have to proceed in order to increase its predictive capabilities.
P Reichert
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Water science and technology : a journal of the International Association on Water Pollution Research     Volume:  43     ISSN:  0273-1223     ISO Abbreviation:  Water Sci. Technol.     Publication Date:  2001  
Date Detail:
Created Date:  2001-05-29     Completed Date:  2001-06-14     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  9879497     Medline TA:  Water Sci Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  51-60     Citation Subset:  IM    
EAWAG, CH-8600 Dübendorf, Switzerland.
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MeSH Terms
Algae / physiology
Energy Metabolism
Hydrogen-Ion Concentration
Models, Theoretical*
Nitrogen / metabolism*
Oxygen / metabolism*
Population Dynamics
Water Pollution*
Reg. No./Substance:
7727-37-9/Nitrogen; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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