ArticleScientific reports2025
Influence of depopulation on pollutant loads generated in the Seto inland sea basin.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The Seto Inland Sea comprises both oligotrophic and eutrophic areas, requiring area-specific water management. To manage the nutrient content of the sea area, it is necessary to accurately determine the pollutant load discharged from the basin, which is believed to be significantly affected by depopulation. However, the impact of depopulation on pollutant loads is not completely clear. This study, therefore, estimated the changes in nitrogen and phosphorus pollutant loads generated in the Seto Inland Sea Basin due to depopulation from 2020 to 2050. While the population of the entire Seto Inland Sea is expected to decrease by approximately 21.1%, the amount of nitrogen is expected to decrease by approximately 12.0% and phosphorus by approximately 14.2%. The rate of decrease in the pollutant load in each sea area varied greatly, ranging from approximately 5% to 21%. The insights gained from this study will contribute to the formulation of appropriate measures for managing the water quality of the Seto Inland Sea. Moreover, they offer valuable guidance for the management of the water environment in other sea areas and their associated basins where population changes are expected.
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