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Home > Archive>Volume 49, Issue 3, 2021 >449-457. DOI:10.11908/j.issn.0253-374x.20313
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Submarine Groundwater Discharge and Dependent Nutrient Input Based on a Series of Layered Monitoring Wells
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1.State Key Laboratory of Marine Geology， Tongji University， Shanghai 200092，China;2.Guangzhou Marine Geological Survey， Guangzhou 510075， Guangdong，China;3.Guangxi Institute of Marine Geological Survey， Beihai 536000， Guangxi，China

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P76

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    Abstract:

    The submarine groundwater of a series of stratified vertical wells near the coast of Beihai， Guangxi was monitored and analyzed on-site. The monitoring and sampling analysis show that the salinity in the groundwater in Confined I which is close to the seaside is relatively high， and the difference in salinity is mainly affected by seawater intrusion and high-level mariculture. The concentration of SiO3-Si in groundwater increases from inland to coastal area due to the “salt effect”， and the low content of PO4-P which may have been caused by the adsorption and removal of iron oxides. The NH4-N and NOx-N concentrations in the phreatic layer are higher than those in confined water. The infiltration of high-level aquaculture pond water results in the highest NH4-N concentration in the nearshore phreatic layer， while NOx-N is affected by denitrification. The average N / P ratio of groundwater in the studied area is 595.85， and the discharge of groundwater with a high N / P ratio into the ocean will promote the transformation of nutrient structure of plankton from N limitation to P limitation.

    Fig.1 Location and section of stratified vertical wells in coastal areas of Beihai, Guangxi
    Fig.2 Piper trilinear nomograph of hydrochemical type of water in stratified vertical wells in coastal areas of Beihai, Guangxi (unit: %)
    Fig.3 Daily variation of depths, salinity and dissolved oxygen of stratified vertical wells in coastal areas of Beihai, Guangxi
    Fig.4 Nutrients (PO4-P, SiO3-Si, NOx-N and NH4＋-N) versus Cl－ concentrations in stratified vertical wells in coastal areas of Beihai, Guangxi
    Fig.5 DIC versus DIC×δ13 C-DIC, and NOx-N versus DIC in unconfined aquifer in coastal areas of Beihai, Guangxi
    Fig.6 N/P ratio in groundwater of GX wells
    Table 1
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WU Zijun, WANG Fukang, CUI Zhenang, GAO Long, Aliya Zidan, ZHU Hongni, WANG Yiqing. Submarine Groundwater Discharge and Dependent Nutrient Input Based on a Series of Layered Monitoring Wells[J].同济大学学报(自然科学版),2021,49(3):449~457

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  • Received:August 05,2020
  • Online: April 06,2021
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