Adyasari, Dini, Oehler, Till and Moosdorf, Nils (2018) Groundwater nutrient inputs into an urbanized tropical estuary system in Indonesia. [Talk] In: IAH Annual Meeting. , September 2018, Daejon, Korea .

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Groundwater discharge is known to transport nutrients into estuaries at several locations around the world. However, few studies report groundwater-associated nutrient fluxes from tropical developing regions such as Southeast Asia, even though this area shows the strongest human modifications in the coastal zone worldwide. We investigated groundwater nutrient flux into two estuaries in the urban area of Jepara, Indonesia, using 222Rn methods, and suggested proper coastal water management based on the results.
A 222Rn spatial survey suggested higher 222Rn activities downstream compared to the upstream area of the river, and also more 222Rn activities in the estuaries than in the open coastline. Total groundwater discharge into the estuary was estimated to 461 x 103 m3 d-1, 42% of the river discharge. Nutrient input from coastal groundwater discharge contributes up to 106 x 103 mol d-1 of dissolve inorganic nitrogen and 5 x 103 mol d-1 of dissolved inorganic phosphorus to the nearshore water. Nutrients in the aquifer system originate from anthropogenic sources such as untreated sewage, agriculture, and manure. As nutrient concentrations in Jepara’s groundwater are comparable to those found in major urban areas in Southeast Asia (e.g., Jakarta, Manila, and Bangkok) even though Jepara has a smaller size and population, coastal groundwater management should be considered to prevent further water quality deterioration in the already eutrophied nearshore water of Jepara. This includes construction of a wastewater treatment plant and sewage system to reduce the point source pollution and riparian systems along the river banks to reduce the diffuse nutrient pollution.
Overall, this study indicated that combination of geological features and regional land use modification in medium populated coastal cities could facilitate strong groundwater nutrient discharge to the coastal area, thus, it should be considered in nutrient budgets and coastal management plans.

Document Type: Conference or Workshop Item (Talk)
Research affiliation: Biogeochemistry and Geology > Submarine Groundwater Discharge
Date Deposited: 01 Sep 2020 12:54
Last Modified: 01 Oct 2020 13:01

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