Xintankou-Luoshan section of the Yangtze River is the longest international dolphin sanctuary.Identifying the hydrochemical characteristics of this section and identifying its influencing factors are the basis for protecting the living en-vironment of the dolphin and carrying out water environment management.6 groups of groundwater and 34 groups of surface water samples were collected in the wet and dry seasons of 2023,respectively.The chemical characteristics of water were an-alyzed by mathematical statistics,Piper three-line diagram,Gibbs diagram and ion ratio method.The evaluation methods of single index,comprehensive quality and index evaluation are used to evaluate the quality of groundwater and surface water in the area.The results shows the cations in surface water and groundwater are mainly Ca2+,and the anions are mainly HCO3-.The hydrochemical type in the wet season is mainly HCO3-Ca type,and the hydrochemical type in the dry season is mainly HCO3-Ca·Mg type.In the wet season,Ca2+and Mg2+,HCO3-were significantly correlated and the correlation coeffi-cient was large,indicating that these three ions may be mainly derived from the dissolution of carbonate rocks.The Gibbs dia-gram shows that rock weathering dominates the hydrogeochemical process in the survey area.The ion ratio indicates that the groundwater components in the area are affected by the weathering of dolomite and limestone.The comprehensive evaluation of water chemistry index shows that the seasonal changes of groundwater and surface water in the Xinluo section of the Yangtze River are obvious.The water quality is good in the wet season,and most of the water quality is lower than grade Ⅲ in the dry season.The evaluation of sodium adsorption ratio(SAR),sodium percentage(SP),magnesium hazard(MH)showed that the surface water and groundwater irrigation water quality in the area was good,and the surface water and groundwater were suit-able for irrigation in the dry season.The evaluation of permeability index(PI)and residual sodium carbonate(RSC)showed that irrigation water should pay attention to local areas that may cause saline-alkali damage to soil and vegetation.
surface watergroundwaterhydrochemistrywater quality evaluationXinluo section of the Yangtze River
维普
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