Influence of the inclination angle on seawater intrusion in seaward-inclined unconfined aquifer
Seawater intrusion is a global environmental geological disaster,and the degree of intrusion is influenced by both geological and human factors.In the investigation of seawater intrusion,the inclina-tion angle of the aquifer bedrock is a geological issue that cannot be disregarded.At present,there are few researches on the influence of the inclination angle of the aquifer bedrock on seawater intrusion sys-tematically.In this study,a color tracing experiment in an indoor sand tank was used to examine how the inclination angle affected seawater intrusion in unconfined aquifers under various hydrodynamic con-ditions.The findings demonstrated an exponential function link between the inclination angle of the aq-uifer bedrock and the length of saltwater wedge.The phenomenon of seawater intrusion weakened with increasing the inclination angle under the conditions of constant-flow boundary and constant-head boundary.While the length and area of saltwater wedge and the time needed to reach steady state de-creased and the fresh water discharge outlet increased.The length of the saltwater wedge decreased by 32.4％,the intrusion area decreased by 35.0％,the groundwater outlet increased by 27.1％,and the equilibrium time decreased by 40.7％when the freshwater boundary flow was 15 mL/min and the incli-nation angle raised from 0° to 10°.Additionally,the length of saltwater wedge was the most sensitive to freshwater discharge,followed by freshwater level and inclination angle.The research results pro-vided scientific basis for quantitative evaluation and prevention of seawater intrusion.
inclination angle of the aquifer bedrockseawater intrusionlaboratory experimentuncon-fined aquifer
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