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Application and evaluation of two nutrient algorithms of hydrological simulation program fortran in Wolf River watershed

Liu, Z. and Kingery, W. L. and Huddleston, D. H. and Hossain F., Hashim N. B. and Kieffer, J. M. (2008) Application and evaluation of two nutrient algorithms of hydrological simulation program fortran in Wolf River watershed. J Environ Sci Health A Tox Hazard Subst Environ Eng., 43 (7). pp. 38-48. ISSN 1093-4529

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Abstract

This study performs a comparison of two nutrient algorithms of Hydrological Simulation Program Fortran, PQUAL/IQUAL and AGCHEM. Watershed nutrient models with, PQUAL/IQUAL and AGCHEM, were developed and calibrated separately with observed data in the Wolf River watershed. Compared to AGCHEM modules, the PQUAL/IQUAL algorithm was found to have several disadvantages. Examples are: (i) it is a simple loading estimation algorithm, and cannot represent the soil nutrient processes; and (ii) the interactions of modeled nutrient species in the soil cannot be simulated. The AGCHEM modules are capable of explicitly representing the comprehensive nutrient processes in the soil such as fertilization, atmospheric deposition, manure application, plant uptake process, and the transformation processes. Therefore, AGCHEM modules afford the ability to evaluate the alternative management practice and model the interactions between nutrient species. However, our modeling results indicated that the inclusion of AGCHEM modules do not significantly improve the nutrient modeling performance but rather take much more time in model development. The nutrient algorithms selection for total maximum daily loads development depends on the data availability, required modeling accuracy, and available time for model development.

Item Type:Article
Uncontrolled Keywords:engineering, environmental exposure/prevention & control, environmental health, environmental pollution/prevention & control, hazardous substances, industrial waste
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Civil Engineering
ID Code:12811
Deposited By: Liza Porijo
Deposited On:30 Jun 2011 05:04
Last Modified:30 Jun 2011 05:04

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