Adyasari, Dini ORCID: https://orcid.org/0000-0002-3114-4053 and Moosdorf, Nils ORCID: https://orcid.org/0000-0003-2822-8261 (2019) Policy Brief 2019/3 - Coastal water management related to submarine groundwater discharge: a study case in Indonesia. [Stakeholder Publication]

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Abstract

SUMMARY

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 harmful bacteria 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. These regions are generally characterized by high aquifer permeability, fast weathering, nutrient-rich rocks, and active natural ecosystems. Thus, active SGD is expected here. Southeast Asia also has one of the most altered 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.

Document Type:	Stakeholder Publication
Programme Area:	PA Not Applicable
Research affiliation:	Biogeochemistry and Geology > Submarine Groundwater Discharge
Related URLs:	Organisation https://dx.doi.org/ 10.21244/zmt.2019.00...
Date Deposited:	24 Mar 2025 14:07
Last Modified:	24 Mar 2025 14:07
URI:	http://cris.leibniz-zmt.de/id/eprint/5620

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