Parallels between stream and coastal water quality associated with groundwater discharge

Autoři: Trista McKenzie aff001;  Henrietta Dulai aff001;  Jennet Chang aff002
Působiště autorů: Department of Earth Sciences, University of Hawaiʻi at Mānoa, School of Ocean and Earth Science and Technology, Honolulu, Hawaiʻi, United States of America aff001;  College of Agriculture, Forestry, and Natural Resource Management, University of Hawaiʻi at Hilo, Hilo, Hawaiʻi, United States of America aff002
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224513


Groundwater-surface water interactions drive water quality in both streams and the coastal ocean, where groundwater discharge occurs in streams as baseflow and along the coastline as submarine groundwater discharge (SGD). Groundwater contributions to streams and to the coastal ocean were quantified in three urban streams in Kāneʻohe Watershed, Hawaiʻi. We used radon as a groundwater tracer to show that baseflow contributions to streams ranged from 22 to 68% along their reaches leading to the coast of Kāneʻohe Bay. Total SGD was 4,500, 18,000, and 23,000 m3/day for the northwest, central, and southern sectors of the bay, respectively. Total groundwater (stream baseflow + SGD) dissolved nutrient fluxes were significantly greater than those sourced from stream surface runoff. The studied streams exhibited increasing nutrient levels downstream from groundwater inputs with high nutrient concentrations, negatively impacting coastal water quality. SGD dynamics were also assessed during the anomalously high perigean spring tides in 2017, where SGD was four times greater during the perigean spring tide compared to a spring tide and resulted in strong shifts in N:P ratios, suggesting that rising sea level stands may disrupt primary productivity with greater frequency. This study demonstrates the importance of considering baseflow inputs to streams to coastal groundwater budgets and suggests that coastal water quality may be improved through management and reduction of groundwater contaminants.

Klíčová slova:

Estuaries – Oceans – Salinity – Spring – Surface water – Water quality – Radon – Tides


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