Endüstri Mühendisliği Bölümü Koleksiyonu

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Browsing Endüstri Mühendisliği Bölümü Koleksiyonu by Subject "Ammonia"

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    Article
    Citation Count: 23
    Nutrient Dynamics in Flooded Wetlands. I: Model Development
    (ASCE-AMER SOC CIVIL ENGINEERS, 2013) Hantush, Mohamed M.; Kalın, Latif; Işık, Sabahattin; Yücekaya, Ahmet
    Wetlands are rich ecosystems recognized for ameliorating floods improving water quality and providing other ecosystem benefits. This part of a two-paper series presents a relatively detailed process-based model for nitrogen and phosphorus retention cycling and removal in flooded wetlands. The model captures salient features of nutrient dynamics and accounts for complex interactions among various physical biogeochemical and physiological processes. The model simulates oxygen dynamics and the impact of oxidizing and reducing conditions on nitrogen transformation and removal and approximates phosphorus precipitation and releases into soluble forms under aerobic and anaerobic conditions respectively. Nitrogen loss pathways of volatilization and denitrification are explicitly accounted for on a physical basis. Processes in surface water and the bottom-active soil layer are described by a system of coupled ordinary differential equations. A finite-difference numerical scheme is implemented to solve the coupled system of ordinary differential equations for various multiphase constituents' concentrations in the water column and wetland soil. The numerical solution algorithm is verified against analytical solutions obtained for simplified transport and fate scenarios. Quantitative global sensitivity analysis revealed consistent model performance with respect to critical parameters and dominant nutrient processes. A hypothetical phosphorus loading scenario shows that the model is capable of capturing the phenomenon of phosphorus precipitation and release under oxic and anoxic conditions respectively.
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    Article
    Citation Count: 8
    Nutrient Dynamics in Flooded Wetlands. II: Model Application
    (ASCE-AMER SOC CIVIL ENGINEERS, 2013) Kalın, Latif; Hantush, Mohamed M.; Işık, Sabahattin; Yücekaya, Ahmet; Jordan, T.
    In this paper the authors applied and evaluated the wetland nutrient model that was described in Paper I. Hydrologic and water quality data from a small restored wetland located on Kent Island Maryland which is part of the Delmarva Peninsula on the eastern shores of the Chesapeake Bay was used for this purpose. The model was assessed through various methods against the observed data in simulating nitrogen (N) phosphorus (P) and total suspended sediment (TSS) dynamics. Time series plots of observed and simulated concentrations and loads generally compared well