Abstract
Abstract. Submarine Groundwater Discharge (SGD), as a way through which solutes and nutrients travel from terrestrial areas towards coastal areas, is part of the hydrological cycle. Various methods are used to locate SGD at different scales. Among them, 222Rn has been developed with the viewpoint of accurate local estimations of SGD points indirectly. This research aims to identify SGD areas in the Yatsushiro Sea, southwest Japan, using the 222Rn method, while considering rivers with high 222Rn concentration in the study area. The area is an inland sea with high tidal fluctuations and there is a large contribution between the sea and groundwater, which are greatly affected by rivers. A multi-detector 222Rn survey has been carried out simultaneously with sea water electrical conductivity (EC) and temperature. In addition, several river grab samples were analysed for 222Rn concentration. Considering the sea water radon distribution and river characteristics, several points were selected for future SGD volume estimations.
Highlights
The submarine groundwater discharge (SGD) is a process through which nutrients, materials and pollutants travel from land to ocean (Burnett et al 2003)
The most significant increase of sea water radon concentration was around the Komenotsu River estuary area, while the Minamata River estuary area represents a very small effect on sea water radon concentration with a diluting effect
The only part of the Amakusa Islands which discharges a high volume of low salinity and moderate 222Rn concentration freshwater is the Kawachi River, (Table 1)
Summary
The submarine groundwater discharge (SGD) is a process through which nutrients, materials and pollutants travel from land to ocean (Burnett et al 2003). The various methods are used to locate SGD are not trivial and salinity is the most obvious SGD tracer in coastal areas This is while the sea water salinity highly affected by freshwater river discharge in estuarine areas. The conventional sampling and analysis methods for 222Rn assessment to locate SGD on a regional scale were developed by Dulaiova et al (2005). They applied a multi-detector system to monitor the 222Rn continuously off the Florida State University Marine Laboratory (FSUML) along the northeast coastline of the Gulf of Mexico by connecting a set of three RAD7 (Durridge Co.) radon detectors and improved the measurement resolution to about 1 record every 10 minutes. The spatial resolution of monitored radon depends on the equipment boat speed in this method
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Proceedings of the International Association of Hydrological Sciences
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
