Biogeochemical impacts of flooding discharge with high suspended sediment on coastal seas: a modeling study for a microtidal open bay

Abstract Freshwater, suspended sediment matter (SSM), and nutrients discharged from rivers into the ocean have large impacts on biological production. In particular, during floods, coastal areas are greatly stirred up and large amounts of nutrients are supplied to the sea surface. We investigate the...

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Autores principales:	Yasuhiro Hoshiba, Hiroyasu Hasumi, Sachihiko Itoh, Yoshimasa Matsumura, Satoshi Nakada
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8e92f5bf6c7c4e2ab5c6a1028067882f
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spelling	oai:doaj.org-article:8e92f5bf6c7c4e2ab5c6a1028067882f2021-11-08T10:49:11ZBiogeochemical impacts of flooding discharge with high suspended sediment on coastal seas: a modeling study for a microtidal open bay10.1038/s41598-021-00633-82045-2322https://doaj.org/article/8e92f5bf6c7c4e2ab5c6a1028067882f2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-00633-8https://doaj.org/toc/2045-2322Abstract Freshwater, suspended sediment matter (SSM), and nutrients discharged from rivers into the ocean have large impacts on biological production. In particular, during floods, coastal areas are greatly stirred up and large amounts of nutrients are supplied to the sea surface. We investigate the biogeochemical impact of flooding river discharges containing a large amount of SSM by conducting numerical simulations for a specific flooding event of the Yura River, Japan. Parameters are varied over wide ranges of SSM properties and nutrient content in riverine water. Two qualitatively different regimes of the riverine plume, hypopycnal and hyperpycnal, appear within realistic parameter ranges. Compared with the reference case without SSM, the surface salinity (nutrients) within the riverine plume becomes lower (higher) in hypopycnal cases and higher (lower) in hyperpycnal cases within a few days after the flooding discharge. These results suggest the necessity of properly taking into account the effect of SSM in assessing the influence of high river discharges on coastal biogeochemistry. It is the case not only for the specific river and event we are dealing with but also for other flooding events and other rivers and connecting coastal seas.Yasuhiro HoshibaHiroyasu HasumiSachihiko ItohYoshimasa MatsumuraSatoshi NakadaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yasuhiro Hoshiba Hiroyasu Hasumi Sachihiko Itoh Yoshimasa Matsumura Satoshi Nakada Biogeochemical impacts of flooding discharge with high suspended sediment on coastal seas: a modeling study for a microtidal open bay
description	Abstract Freshwater, suspended sediment matter (SSM), and nutrients discharged from rivers into the ocean have large impacts on biological production. In particular, during floods, coastal areas are greatly stirred up and large amounts of nutrients are supplied to the sea surface. We investigate the biogeochemical impact of flooding river discharges containing a large amount of SSM by conducting numerical simulations for a specific flooding event of the Yura River, Japan. Parameters are varied over wide ranges of SSM properties and nutrient content in riverine water. Two qualitatively different regimes of the riverine plume, hypopycnal and hyperpycnal, appear within realistic parameter ranges. Compared with the reference case without SSM, the surface salinity (nutrients) within the riverine plume becomes lower (higher) in hypopycnal cases and higher (lower) in hyperpycnal cases within a few days after the flooding discharge. These results suggest the necessity of properly taking into account the effect of SSM in assessing the influence of high river discharges on coastal biogeochemistry. It is the case not only for the specific river and event we are dealing with but also for other flooding events and other rivers and connecting coastal seas.
format	article
author	Yasuhiro Hoshiba Hiroyasu Hasumi Sachihiko Itoh Yoshimasa Matsumura Satoshi Nakada
author_facet	Yasuhiro Hoshiba Hiroyasu Hasumi Sachihiko Itoh Yoshimasa Matsumura Satoshi Nakada
author_sort	Yasuhiro Hoshiba
title	Biogeochemical impacts of flooding discharge with high suspended sediment on coastal seas: a modeling study for a microtidal open bay
title_short	Biogeochemical impacts of flooding discharge with high suspended sediment on coastal seas: a modeling study for a microtidal open bay
title_full	Biogeochemical impacts of flooding discharge with high suspended sediment on coastal seas: a modeling study for a microtidal open bay
title_fullStr	Biogeochemical impacts of flooding discharge with high suspended sediment on coastal seas: a modeling study for a microtidal open bay
title_full_unstemmed	Biogeochemical impacts of flooding discharge with high suspended sediment on coastal seas: a modeling study for a microtidal open bay
title_sort	biogeochemical impacts of flooding discharge with high suspended sediment on coastal seas: a modeling study for a microtidal open bay
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/8e92f5bf6c7c4e2ab5c6a1028067882f
work_keys_str_mv	AT yasuhirohoshiba biogeochemicalimpactsoffloodingdischargewithhighsuspendedsedimentoncoastalseasamodelingstudyforamicrotidalopenbay AT hiroyasuhasumi biogeochemicalimpactsoffloodingdischargewithhighsuspendedsedimentoncoastalseasamodelingstudyforamicrotidalopenbay AT sachihikoitoh biogeochemicalimpactsoffloodingdischargewithhighsuspendedsedimentoncoastalseasamodelingstudyforamicrotidalopenbay AT yoshimasamatsumura biogeochemicalimpactsoffloodingdischargewithhighsuspendedsedimentoncoastalseasamodelingstudyforamicrotidalopenbay AT satoshinakada biogeochemicalimpactsoffloodingdischargewithhighsuspendedsedimentoncoastalseasamodelingstudyforamicrotidalopenbay
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Biogeochemical impacts of flooding discharge with high suspended sediment on coastal seas: a modeling study for a microtidal open bay

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