id author title date pages extension mime words sentences flesch summary cache txt cord-017003-3farxcc3 Koibuchi, Yukio Numerical Simulation of Urban Coastal Zones 2010 .txt text/plain 7577 476 53 Such a mixing process continues until the river water reaches the same density as the surrounding sea water, resulting in vertical circulation in the bays that is is several to ten times greater than the river flux (Unoki 1998) . The ecosystem model introduced here was developed to simulate the nutrient budget of an urban coastal zone. To quantify the nutrients budget, we applied our numerical model to Tokyo Bay. The computational domain was divided into 1km horizontal grids with 20 vertical layers. Fig. 3-13 shows the calculation results of an annual budget of nitrogen and phosphorus in Tokyo Bay. The annual budget is useful in understanding nutrient cycles. We have developed a water quality model to simulate both nutrient cycles and pathogens distributions, and coupled it with a three-dimensional hydrodynamic model of urban coastal areas. We applied this model to the Tokyo Bay and simulated water column temperatures, salinity, and nutrient concentrations that were closely linked with field observations. ./cache/cord-017003-3farxcc3.txt ./txt/cord-017003-3farxcc3.txt