scholarly journals Influences of the stream groundwater hydrology on nitrate concentration in unsaturated riparian area bounded by an intermittent Mediterranean stream

2003 ◽  
Vol 39 (4) ◽  
Author(s):  
A. Butturini ◽  
S. Bernal ◽  
C. Hellin ◽  
E. Nin ◽  
L. Rivero ◽  
...  
2004 ◽  
Author(s):  
Brian J. Palik ◽  
Swee May Tang ◽  
Quinn. Chavez
Keyword(s):  
Land Use ◽  

2019 ◽  
Author(s):  
Chem Int

Mathematical model was developed and evaluated to monitor and predict the groundwater characteristics of Trans-amadi region in Port Harcourt City. In this research three major components were considered such as chloride, total iron and nitrate concentration as well as the polynomial expression on the behavious on the concentration of each component was determined in terms of the equation of the best fit as well as the square root of the curve. The relationship between nitrate and distance traveled by Nitrate concentration by the model is given as Pc = 0.003x2 - 0.451x + 14.91with coefficient of determination, R² = 0.947, Chloride given as Pc = 0.000x2 - 0.071x + 2.343, R² = 0.951while that of Total Iron is given as Pc = 2E-05x2 - 0.003x + 0.110, R² = 0.930. All these show a strong relationship as established by Polynomial Regression Model. The finite element techniques are found useful in monitoring, predicting and simulating groundwater characteristics of Trans-amadi as well as the prediction on the variation on the parameters of groundwater with variation in time.


Author(s):  
Toru HIRAOKA ◽  
Yukio TOYOMITSU ◽  
Kei NAKAGAWA ◽  
Hirofumi NONAKA ◽  
Masaharu HIROTA ◽  
...  

2019 ◽  
Author(s):  
Laura J. Crossey ◽  
◽  
Karl E. Karlstrom ◽  
Abraham E. Springer ◽  
Benjamen Tobin ◽  
...  

1998 ◽  
Vol 37 (12) ◽  
pp. 149-156 ◽  
Author(s):  
Carl-Fredrik Lindberg

This paper contains two contributions. First it is shown, in a simulation study using the IAWQ model, that a linear multivariable time-invariant state-space model can be used to predict the ammonium and nitrate concentration in the last aerated zone in a pre-denitrifying activated sludge process. Secondly, using the estimated linear model, a multivariable linear quadratic (LQ) controller is designed and used to control the ammonium and nitrate concentration.


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