Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation Experiment
A tsunami induced by the Nankai Trough earthquake may disturb marine sediments in the inner part of Osaka Bay. Since nutrient release from marine sediments has a significant impact on nu-trient concentrations in seawater, an incubation experiment was conducted to estimate the release rates of NH4-N...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-05-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/11/2041 |
| _version_ | 1797596691794231296 |
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| author | Mitsuru Hayashi Tetsunori Inoue Soichi Hirokawa |
| author_facet | Mitsuru Hayashi Tetsunori Inoue Soichi Hirokawa |
| author_sort | Mitsuru Hayashi |
| collection | DOAJ |
| description | A tsunami induced by the Nankai Trough earthquake may disturb marine sediments in the inner part of Osaka Bay. Since nutrient release from marine sediments has a significant impact on nu-trient concentrations in seawater, an incubation experiment was conducted to estimate the release rates of NH4-N and PO4-P in order to understand the present rates and to quantify the changes in the rates caused by tsunamis in Osaka Bay. The current release rate of NH4-N is an extension of the decreasing trend since 2000. The PO4-P release rate has remained at a low level since 2008. The release rate of redeposited sediments after exposure to the aerobic environment caused by a tsunami may decrease to approximately 70% of the current level for NH4-N and 60% for PO4-P. Nutrient concentrations and fishing have begun to decline in Osaka Bay. A reduction in the nutrient release rate by tsunamis may further limit primary production under the current situation where the contribution of release to nutrients in seawater is significant. |
| first_indexed | 2024-03-11T02:53:43Z |
| format | Article |
| id | doaj.art-5d03c97ca05f4e749ef130f815ebc3d7 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-11T02:53:43Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-5d03c97ca05f4e749ef130f815ebc3d72023-11-18T08:46:48ZengMDPI AGWater2073-44412023-05-011511204110.3390/w15112041Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation ExperimentMitsuru Hayashi0Tetsunori Inoue1Soichi Hirokawa2Research Center for Inland Seas, Kobe University, Kobe 658-0022, JapanMarine Pollution Management Group, Port and Airport Research Institute, Yokosuka 239-0826, JapanGraduate School of Maritime Sciences, Kobe University, Kobe 658-0022, JapanA tsunami induced by the Nankai Trough earthquake may disturb marine sediments in the inner part of Osaka Bay. Since nutrient release from marine sediments has a significant impact on nu-trient concentrations in seawater, an incubation experiment was conducted to estimate the release rates of NH4-N and PO4-P in order to understand the present rates and to quantify the changes in the rates caused by tsunamis in Osaka Bay. The current release rate of NH4-N is an extension of the decreasing trend since 2000. The PO4-P release rate has remained at a low level since 2008. The release rate of redeposited sediments after exposure to the aerobic environment caused by a tsunami may decrease to approximately 70% of the current level for NH4-N and 60% for PO4-P. Nutrient concentrations and fishing have begun to decline in Osaka Bay. A reduction in the nutrient release rate by tsunamis may further limit primary production under the current situation where the contribution of release to nutrients in seawater is significant.https://www.mdpi.com/2073-4441/15/11/2041nutrient release ratemarine sedimentredepositionincubation experimentOsaka BayNankai Trough earthquake |
| spellingShingle | Mitsuru Hayashi Tetsunori Inoue Soichi Hirokawa Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation Experiment Water nutrient release rate marine sediment redeposition incubation experiment Osaka Bay Nankai Trough earthquake |
| title | Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation Experiment |
| title_full | Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation Experiment |
| title_fullStr | Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation Experiment |
| title_full_unstemmed | Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation Experiment |
| title_short | Estimation of Changes in the Nutrient Release Rate from Sediments after a Tsunami by an Incubation Experiment |
| title_sort | estimation of changes in the nutrient release rate from sediments after a tsunami by an incubation experiment |
| topic | nutrient release rate marine sediment redeposition incubation experiment Osaka Bay Nankai Trough earthquake |
| url | https://www.mdpi.com/2073-4441/15/11/2041 |
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