One-Dimensional Modeling of Water Quality and Aquatic Ecosystems in Streams

CCHE1D is a one-dimensional channel network model developed at the National Center for Computational Hydroscience and Engineering, the University of Mississippi. Recently, the CCHE1D has been enhanced to simulate water quality and aquatic ecosystems in streams. The numerical model computes stream water temperature by considering heat fluxes across the water surface. The aquatic ecosystem model considers a simple food-chain model of phytoplankton, Zooplankton and fish. It simulates the changing concentrations of biotic organisms and couples with water quality parameters by considering processes of photosynthesis, respiration, mortality, decomposition and nutrient cycling. The integrated CCHE1D water quality and ecosystem model has been tested in the Tualatin River, Oregon. It well predicts the water temperature, phytoplankton biomass, Zooplankton biomass and other water quality parameters along the simulation domain.