Adyasari, Dini, Oehler, Till and Moosdorf, Nils (2018) Nutrient fluxes associated with submarine groundwater discharge at the urbanized tropical estuary and coast of Jepara, Indonesia. [Poster] In: Ra/Rn workshop. , July 2018, Delmenhorst .

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Submarine groundwater discharge (SGD) is known to transport significant amounts of nutrients from coasts into the ocean. SGD-related nutrient studies in tropical Southeast Asia, which has been hypothesized to be a hotspot of SGD, are scarce compared to other sites around the world. In this study, 222Rn was used to assess SGD in the estuaries and along the siliciclastic sedimentary coast of Jepara, Indonesia, in the wet season. In addition, fluxes of DIN and DIP were also investigated. Fresh groundwater was mostly discharged in the downstream part of the river and its quantity was estimated 461 x 103 m3 d-1 or up to 42% of the river discharge, while SGD flux in the coastline was a mixture of meteoric and recirculated groundwater. We found that the nutrients in the SGD were mainly originated from untreated sewage, agriculture, and manure input. SGD-derived nutrient flux in Jepara can be categorized as high compared to other studies in more industrialized sites, which could potentially resulted from a combination of geological factor and human activities both inland and in the touristy coastal areas. Thus, our results indicate that medium populated cities with highly modified regional land use can contribute a significant amount of nutrient discharge in the coastal area and should be included in global assessments of nutrient budget calculation.

Document Type: Conference or Workshop Item (Poster)
Research affiliation: Biogeochemistry and Geology > Submarine Groundwater Discharge
Date Deposited: 01 Sep 2020 12:57
Last Modified: 01 Oct 2020 13:01

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