Sediment Flux Model for Manganese and Iron.

Abstract

The work reported herein was conducted as part of the Water Quality Research Program (WQRP), Work Unit No. 32694. The WQRP is sponsored by Headquarters, U.S. Army Corps of Engineers (HQUSACE), and is assigned to the US. Army Engineer Waterways Experiment Station (WES) under the purview of the Environmental Laboratory (EL). Funding was provided under Department of the Army Appropriation No. 96x3 121, General Investigation. The WQRP is managed under the Environmental Resources Research and Assistance Programs (ERRAP). Dr. John Barko was Manager, ERRAP, and Mr. Robert Gunkel was Assistant Manager, ERRAP, for the WQRP. Technical Monitors during the study were Messrs. Pete Juhle and James Gottesman and Dr. John Bushman, HQUSACE. Principal Investigator of the Work Unit was Dr. Carl E Cerco, Water Quality and Contaminant Modeling Branch (WQCMB), Environmental Processes and Effects Division (EPED), EL.

A Numerical Study of Hypoxia in Chesapeake Bay Using an Unstructured Grid Model: Validation and Sensitivity to Bathymetry Representation

“…Reaeration provides sources of oxygen from the atmosphere. The sediment flux model developed by Di Toro and Fitzpatrick (1993) was incorporated into ICM, which simulates remineralization processes in the sediment (Figure 2). The sediment flux model is driven by the net settling of particulate organic carbon, nitrogen, phosphorus, and silica from the overlying water column and outputs the sediment oxygen demand and inorganic nutrients fluxes into the water column through remineralization processes.…”

Mechanisms Controlling Climate Warming Impact on the Occurrence of Hypoxia in Chesapeake Bay

“…ICM uses the DiToro-Fitzpatrick diagenesis model to simulate the flux of organic matter to the bottom sediment and the remineralization, burial, and flux of nutrients and COD from the sediment to the water column (DiToro and Fitzpatrick 1993). Two sediment layers (aerobic and anaerobic) are simulated, and organic substances are divided into three categories based on the rate of remineralization (Westrich and Berner 1984) as G 1 , G 2 , and G 3 .…”

A Sediment Diagenesis Model of Seasonal Nitrate and Ammonium Flux Spatial Variation Contributing to Eutrophication at Taihu, China

“…It has 22 state variables in the water column and is coupled with 27 state variable sediment diagenesis models. The sediment diagenesis model is based on a recording of the model developed by DiToro and Fitzpatrick [9]. The sediment diagenesis model receives particulate organic matter (POM), in this case, specifically particulate organic nitrogen (PON), which has been deposited from the water column.…”

“…The sediment diagenesis process transforms particulate organic matter (POM) deposited into dissolved matters at the benthic region, which results in the production of diagenesis fluxes. Sediment flux recycles the products of diagenesis and consistently renders the water quality of the lake low [2,8,9]. These diffused nutrients from the sediment bed contribute immensely to eutrophication problems, even after external sources have been substantially reduced [10].…”