Journal of Yangtze River Scientific Research Institute ›› 2022, Vol. 39 ›› Issue (10): 8-15.DOI: 10.11988/ckyyb.20210629

• WATER RESOURCES • Previous Articles     Next Articles

Calculating Submarine Groundwater Discharge in the East Coast of Liaodong Bay Based on the Improved Radium Mass Balance Model

GUO Qiao-na, LI Meng-jun, ZHAO Yue, DOU Zhi, ZHOU Zhi-fang   

  1. School of Earth Sciences and Engineering, Hohai University, Nanjing 210000, China
  • Received:2021-06-23 Revised:2021-09-23 Published:2022-10-13

Abstract: Submarine groundwater discharge (SGD) represents an essential part of the global water cycle and one of the vital ways to transport various chemical substances such as nutrients to the ocean.The influences of recirculated seawater (RSGD) on water body refresh time, SGD, and the flux of nitrogen and phosphorus nutrients in Yingkou sea area in the eastern part of Liaodong Bay were investigated by establishing and improving the radium mass balance model with natural radium isotopes (224Ra and 228Ra) as tracers.The water refresh time calculated by the radium mass balance model is 9 days while by the improved radium mass balance model 14.35-18.11 days.The SGD flux in the traditional model is (3.01-3.51)×108 m3/d while in the improved model (3.55-4.39)×108 m3/d.The water refresh time and SGD calculated by the improved model increased by 59.44%-101.22% and 17.94%-25.07%, respectively, compared with those by the traditional model.Moreover, the nitrogen and phosphorus nutrient fluxes from groundwater to the sea are 1.73×108 mol/d and 1.52×109 mol/d, respectively, in consideration of RSGD.In conclusion, RSGD has a remarkable impact on SGD and nutrient fluxes.

Key words: submarine groundwater discharge, radium isotopes, improved radium mass balance model, nitrogen and phosphorus nutrients, Yingkou sea area

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