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

Zhang, Yan1,2; Wang, Xuejing3; Li, Hailong2,3; Song, Dehai4

2020-05-04

10.1007/s10040-020-02144-8

HYDROGEOLOGY JOURNAL   影响因子和分区

1431-2174

1435-0157

Submarine groundwater discharge (SGD) as a major source of alkalinity has rarely been studied in Jiaozhou Bay, China. The presented study used radon (Rn-222) and radium isotopes to investigate SGD and its influence on alkalinity and nutrient inputs into the bay. Time-series observations of Rn-222 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) x 10(7) m(3)/day in wet season and (5.81-6.83) x 10(6) m(3)/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.

Submarine groundwater discharge Radon Radium Hydrochemistry China

SCI

英语

通讯

National Natural Science Foundation of China[41,430,641][41,890,852] ; National Basic Research Program of China ("973" Program)[2015CB452901][2015CB452902]

Geology ; Water Resources

Geosciences, Multidisciplinary ; Water Resources

WOS:000530173500002

SPRINGER

GEOSCIENCES

Web of Science

1.China Univ Geosci Beijing, MOE Key Lab Groundwater Circulat & Environm Evolu, Sch Water Resources & Environm, Beijing 100083, Peoples R China
2.China Univ Geosci Beijing, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China
3.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Guangdong Prov Key Lab Soil & Groundwater Pollut, Shenzhen 518055, Peoples R China
4.Ocean Univ China, Key Lab Phys Oceanog, Qingdao 266100, Peoples R China

Zhang, Yan,Wang, Xuejing,Li, Hailong,et al. Large inputs of groundwater and associated fluxes of alkalinity and nutrients into Jiaozhou Bay, China[J]. HYDROGEOLOGY JOURNAL,2020,28(5):1721-1734.

Zhang, Yan,Wang, Xuejing,Li, Hailong,&Song, Dehai.(2020).Large inputs of groundwater and associated fluxes of alkalinity and nutrients into Jiaozhou Bay, China.HYDROGEOLOGY JOURNAL,28(5),1721-1734.

Zhang, Yan,et al."Large inputs of groundwater and associated fluxes of alkalinity and nutrients into Jiaozhou Bay, China".HYDROGEOLOGY JOURNAL 28.5(2020):1721-1734.