Adyasari, Dini and Moosdorf, Nils (2019) Coastal water management related to submarine groundwater discharge: a study case in Indonesia. . Policy Brief, 3 . ZMT, Bremen, 4 pp. DOI

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Fresh submarine groundwater discharge (SGD) is described as fresh groundwater flux from land to ocean through submarine ocean boundaries. It has been reported to bring land-based nutrients, heavy metals, or potentially harmfulbacteria to the coastal area. Solutes delivered by SGD have been reported to cause eutrophication, change in coastal bacterial, benthic, and fish communities, as well as the deterioration of coastal ecosystems such as coral reef and mangroves. SGD rates tend to vary and fluctuate due to tidal cycle, hydraulic head, and seasonal variability, particularly in regions with high precipitation and groundwater recharge. Tropical regions, such as Southeast Asia, have been underrepresented in SGD studies. Theseregions are generally characterized byhigh aquifer permeability, fast weathering, nutrient-rich rocks, and active natural ecosystems. Thus, active SGD is expected here. Southeast Asia also has one of the mostaltered coastal land use worldwide, which subsequently makes SGD potentially act as an essential land-ocean delivery pathway of contaminant derived from human activities. Indonesia was chosen as a study site due to its long coastline and favorable hydrogeological conditions for SGD as mentioned above. Based on these backgrounds, we discussed three main topics in this study:
•SGD rates and composition, particularly related to nutrients in urban areas,
•Potential environmental and health effects of SGD from urban areas, and
•Suggested coastal water management practices based on literature review and the result of the SGD studies.KEY RESULTS
•Groundwater and SGD connect coastal waters with their hinterland. SGD delivers land-based nutrients from land to ocean.
•SGD may potentially bring human pathogens to coastal water and affect the health of swimmers.
•Geological condition and anthropogenic activities in the watershed affect SGD water quality.
•SGD may alter the physicochemic al condition of the receiving coastal water and can affect the composition of coral cover and species diversity.
•In tropical regions, SGD is affected highly by seasonal dynamics and less by tidal cycle. RECOMMENDATIONSTo reduce adverse effects of SGD on ecosystems and human health:
•Control potential pollutant or nutrient input to aquifer systems considering coastal waters as their recipients•Improve or strengthen sanitation systems
•Implement a regular water quality monitoring scheme
•Ensure transparency of the water policy network
•Enforce established environmental regulations
•Include circumstances on both land and coast to develop strategies for proper SGD management

Document Type: Report (Working Paper)
Research affiliation: Biogeochemistry and Geology > Submarine Groundwater Discharge
DOI etc.:
Date Deposited: 02 Dec 2019 14:55
Last Modified: 01 Oct 2020 13:00

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