Study on the influence of seawater density variation on sea water intrusion in confined coastal aquifers
- 48 Downloads
The coupled influence of seawater density and groundwater level variation plays an import role in seawater intrusion in confined coastal aquifers. In this study, the effects of seawater density variations along with changing hydraulic gradients were investigated by conducting laboratory experiments and numerical simulations. Parameters of salinty and density in the experiments are based on the references related Bohai sea of China. The results indicate that the higher density of saltwater facilitates the seawater intrusion into the aquifers at the bottom and accelerates the circulation at the changing hydraulic gradient. Even slight variations in saltwater density can change the steady-state conditions in a confined aquifer, which should be considered when attempting to control the intrusion of seawater. Moreover, the influence of seawater density variations on transient salt-wedge dynamics was also examined in these experiments. Numerical modelling was simultaneously performed to mimic the behaviour of SW using the TOUGH2/EOS7 package. The simulated results were generally consistent with those obtained from the experiments. This study is conducive to further understand the mechanism of seawater intrusion, thereby leading to effective management of the problem in coastal areas.
KeywordsSeawater intrusion Seawater density Saltwater wedge Laboratory experiments Numerical simulation
This study was supported by the National Key Research and Development Program of China (2016YFC0402803-02), The National Natural Science Foundation of China (Grant nos. 41807194, 41902263 and 41807208), Natural Science Foundation of Hubei Province of China (2018CFB258), State Key Laboratory of Groundwater Protection and Utilization of Coal Mining (SHJT-17-42.9).
- Goswami RR, Clement TP (2007) Laboratory-scale investigation of saltwater intrusion dynamics. Water Resourc Res 43(43):576Google Scholar
- Henry HR (1960) Salt intrusion into coastal aquifers. Ph.D. thesis, Columbia University, New YorkGoogle Scholar
- Henry HR (1964) Effects of Dispersion on Salt Encroachment in Coastal Aquifers. In: sea water in coastal aquifers. U. S. G. S. Water-supply Pap. 1964, 1613Google Scholar
- Kuang (2009) The impact of climate change on inter-annual and long term variation of the salinity of Bohai sea abstract. In: Ocean University of ChinaGoogle Scholar
- Pruess K (1991) EOS7, an equation-of-state module for the TOUGH2 simulator for two-phase flow of saline water and air. In: Technical report LBL-31114, Lawrence Berkeley Laboratory, Berkeley, CaliforniGoogle Scholar
- Pruess K, Oldenburg CM, Moridis GJ (1999) TOUGH2 user’s guide version 2 Tough2 users guide version. In: Lawrence Berkeley National LaboratoryGoogle Scholar
- Rastogi AK, Choi GW, Ukarande SK (2004) Diffused interface model to prevent ingress of seawater in multi-layer coastal aquifers. J Spatial Hydrol 2004:2Google Scholar
- Sun DM, Niu SX, Zang YG (2017) Impacts of inland boundary conditions on modeling seawater intrusion in coastal aquifers due to sea-level rise. Natural Hazards 88(4):1–19Google Scholar
- Xu T (2008) TOUGHREACT user’s guide: a simulation program for non-isothermal multiphase reactive geochemical transport in variably saturated geologic media, V1. 2.1. In: Lawrence Berkeley National LaboratoryGoogle Scholar