A physically distributed hydrological model (WEP model) was coupled with a newly developed physically distributed model of heat transport in river water to simulate watershed scale hydrological and heat transport processes and resulting effects on stream environment. The model is characterized by the capability of simulating runoff from a highly urbanized watershed with a dual drainage system of river channels and a sewer network, which enables appropriate prediction of inflows to wastewater treatment plants and river floods. Also, this model is designed to investigate factors affecting spatial and temporal variations of stream temperature by incorporating anthropogenic heat impacts and urban canopy processes. Applying the model to the Kanda River Watershed, stream flow and temperature as well as inflows to a WWTP are well simulated. The anthropogenic heat impact on stream temperature was also simulated.
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