Evaluation of seawater intrusion in Tangshan based on entropy-weight attribute recognition model
Widespread intrusion of saline seawater in Tangshan posed significant challenges to the sus-tainable utilization of groundwater resources.By analyzing monitoring data of groundwater chemistry,characteristic indicators including Cl-,TDS,SO42-,A(salinization coefficient),and SAR(sodium ad-sorption ratio)were selected.Utilizing an entropy-weighted attribute recognition model,the degree of saline seawater intrusion in Tangshan was evaluated.The results indicated that the mildly invaded area by saline seawater in Tangshan was approximately 1.98 X 103 km2,while the severely invaded area was about 1.87 X 103 km2.The maximum intrusion distance of saline seawater in Tangshan was 41.4 km,along the Dongyutuo-Xiaoshuangtuo village line.A comparison between the entropy-weighted at-tribute recognition model and the single-index method for intrusion assessment demonstrated a 70.8％consistency.However,the entropy-weighted attribute recognition model better reflected the transition zone between saline and fresh water,the ion exchange phenomena and the water quality variations caused by historical saline water intrusion,making the results more precise and reliable.
seawater intrusionentropy weight methodattribute recognition modelchloride ion method
NETL
NSTL
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