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The model results were closely aligned with observed water quality concentrations along the LMNR moreover, the model reproduced temporal and spatial distributions of nitrogen species, phosphorus species, algae and dissolved oxygen against results created from the CE-QUAL-W2 model. HEC‐RAS‐NSM I was applied to the lower Minnesota River (LMNR). have already been modeled with HEC-RAS, the addition of the NSM to the HEC-RAS modeling system allows users to quickly extend the existing models to simulate water quality, thus saving time and money. Since most large river systems - as well as many smaller rivers and streams in the U.S.
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Before HEC-RAS-NSM, no 1-D model existed that allowed detailed simulation of nutrient fate and transport at this level of detail. HEC-RAS-NSM allows users to simulate the fate and transport of nutrients in a 1-D dendritic channel system. NSM Libraries Can Be Added Quickly and Efficiently The HEC‐RAS‐NSM provides the public with a fully integrated riverine hydraulic, sediment and water quality model and will greatly aid users with determining total maximum daily loads (TMDLs). The NSM is able to simulate carbon, nitrogen, phosphorus, silica cycles, algae, benthic algae, dissolved oxygen, carbonaceous biological oxygen demand and pathogen and sediment diagenesis processes. The Nutrient Simulation Modules (NSM), developed by the ERDC Environmental Laboratory, is a set of water quality dynamic-linked libraries (DLLs) within HEC‐RAS. It can be used to analyze river flows and sediment transport. The Hydrologic Engineering Center – River Analysis System (HEC‐RAS) is an industry standard hydraulic model used widely in the U.S. A Model for Water Resources Management and Ecosystem Restoration