Abstract
A numerical simulatiuon model is presented to describe the material cycling in a mangrove area, to which the ecosystem model is applied in order to take into account of the chemical and biological reaction. In this model, the nutrient transport from the groundwater to the river is estimated by tandem use of field measurement and numerical simulation for groundwater flow. The water movement and the temporal variations of nutrient concentrations obtained from the numerical simulation show a good agreement with the observed results, indicating that this model is valid for simulating the material cycling in a mangrove area. The result of the numerical simulation has revealed that the amount of the supply of dissolved nutrient from the mangrove area to the coastal area at spring tide is 2 to 5 times larger than that at neap tide.
