Dynamics of carbon dioxide in soil profiles based on long-term field observation

2001 ◽  
Vol 15 (10) ◽  
pp. 1829-1845 ◽  
Author(s):  
Y. Hamada ◽  
T. Tanaka
Keyword(s):  
Carbon Dioxide ◽  
Field Observation ◽  
Soil Profiles ◽  
Term Field

scholarly journals LONG-TERM FIELD OBSERVATION AND APPLICATION OF WEPP MODEL FOR SEDIMENT YIELD AND TRANSPORT IN NAGURA WATERSHED

2008 ◽  
Vol 52 ◽  
pp. 577-582 ◽  
Author(s):  
Kazutoshi OSAWA ◽  
Syunsuke IKEDA ◽  
Ryuzaburo KUBOTA ◽  
Keigo NODA ◽  
Yoshihisa AKAMATSU
Keyword(s):  
Sediment Yield ◽  
Field Observation ◽  
Term Field

SIMULATION OF NITRIFICATION AND DENITRIFICATION PROCESSES IN A TIDAL RIVER

1994 ◽  
Vol 30 (2) ◽  
pp. 43-52 ◽  
Author(s):  
Tetsuya Kusuda ◽  
Tohru Futawatari ◽  
Kyoko Oishi
Keyword(s):  
Water Quality ◽  
Field Observation ◽  
Tidal River ◽  
Sediment Surface ◽  
Water Volume ◽  
Water Quality Control ◽  
Laboratory Test Results ◽  
Nitrification And Denitrification ◽  
Term Field

Nitrification and denitrification processes in a well mixed tidal river in Japan are modeled, based on results of long term field observation on water quality and sediments in the river. Laboratory test results and values in references are used for the determination of parameters and coefficients in the model. In modeling of the processes, sediments, suspended solids, and overlying water are taken as elements and in computation a Lagrangian reference frame in terms of accumulated water volume is employed for reduction in numerical dispersion. Simulation results on ammonium and nitrate nitrogen, showing good agreement with long term field observation results, qualitatively explain well the processes in the river. The results indicate some countermeasures to reduce nitrate more such as the increase in the area of sediment surface. The simulation model is available for the estimation of water quality in well mixed tidal rivers and applicable for water quality control.

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