Abstract
Mikawa Bay is a very shallow inner bay situated between the Atsumi and Chita peninsulas in the Aichi prefecture. The port section is not very large and is a closed ocean area with minimal external seawater exchange. This makes it easy for pollutants to build up, and the area is known for frequent outbreaks of red or discolored tides. Therefore, purifying the Mikawa Bay environment (i.e., infrastructure, sewage systems, septic tanks, private and industrial wastewater, seawater, and sediment pollution) has become a priority. The objective of this study is to provide a quantitative evaluation of the environmental impact of economic activities in the Mikawa Bay watershed and surrounding regions (e.g., Toyogawa, Yahagi, Sakaigawa river basins, Atsumi Bay watershed, and Chita Bay watershed). We estimate an interregional input–output table of the Aichi prefecture and analyze the relationship between each city and town, and their environmental impact on Mikawa Bay, considering economic trade relationships using the input–output and optimization models.
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