Hayashi, M.; Inoue, T.; Hirokawa, S. Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation Experiment. Water2023, 15, 2041.
Hayashi, M.; Inoue, T.; Hirokawa, S. Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation Experiment. Water 2023, 15, 2041.
Hayashi, M.; Inoue, T.; Hirokawa, S. Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation Experiment. Water2023, 15, 2041.
Hayashi, M.; Inoue, T.; Hirokawa, S. Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation Experiment. Water 2023, 15, 2041.
Abstract
Nutrient release from marine sediments in Osaka Bay has a significant impact on nutrient concentrations in seawater. A tsunami induced by the Nankai Trough earthquake may disturb marine sediments in the inner part of Osaka Bay. An incubation experiment to estimate the release rates of NH4-N and PO4-P was conducted to understand the present conditions and to quantify the changes caused by tsunamis. Two types of cores were created: a "control core" representing the current sediment, and a "redeposition core" representing the redeposition after the tsunami. The release rates have been decreasing since the year 2000 and have remained low. The experimental results suggest that the release rate after exposure to an aerobic environment by a tsunami may decrease to approximately 70% for NH4-N and 60% for PO4-P of the current level. In the past, the release rates were values experienced in the inner part of Osaka Bay. However, the reduction in the release rate by tsunamis may be more limiting for primary production under the current situation where the contribution of release for nutrients in seawater is significant.
Environmental and Earth Sciences, Water Science and Technology
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