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Erschienen in: Hydrogeology Journal 5/2020

04.05.2020 | Paper

Large inputs of groundwater and associated fluxes of alkalinity and nutrients into Jiaozhou Bay, China

verfasst von: Yan Zhang, Xuejing Wang, Hailong Li, Dehai Song

Erschienen in: Hydrogeology Journal | Ausgabe 5/2020

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Abstract

Submarine groundwater discharge (SGD) as a major source of alkalinity has rarely been studied in Jiaozhou Bay, China. The presented study used radon (222Rn) and radium isotopes to investigate SGD and its influence on alkalinity and nutrient inputs into the bay. Time-series observations of 222Rn were used to quantify groundwater dynamics over tidal time scales and the results showed that the SGD rates at point-scale were 0–67.2 (mean: 17.8) cm/day and 0–43.6 (mean: 12.3) cm/day in wet and dry seasons, respectively. Using radium mass balance models, the SGD in the whole bay was estimated to be (1.29–2.60) × 107 m3/day in wet season and (5.81–6.83) × 106 m3/day in dry season. Thus, both sets of results indicated higher SGD fluxes in wet season than in dry season. Such a seasonal variation pattern suggests a rapid response to local precipitation. The alkalinity fluxes associated with SGD were generally greater than those from the local rivers. Among the nutrient sources, SGD contributed about 63, 24 and 37% of total dissolved inorganic nitrogen, reactive phosphorus and silicate inputs, respectively. These results demonstrated that groundwater seepage is a major factor driving alkalinity and nutrients (especially dissolved inorganic nitrogen) into Jiaozhou Bay. SGD may have an important influence on the budgets of elements (C, N, P) and ecological environments in coastal waters.

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Metadaten
Titel
Large inputs of groundwater and associated fluxes of alkalinity and nutrients into Jiaozhou Bay, China
verfasst von
Yan Zhang
Xuejing Wang
Hailong Li
Dehai Song
Publikationsdatum
04.05.2020
Verlag
Springer Berlin Heidelberg
Erschienen in
Hydrogeology Journal / Ausgabe 5/2020
Print ISSN: 1431-2174
Elektronische ISSN: 1435-0157
DOI
https://doi.org/10.1007/s10040-020-02144-8

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