三门峡库区湿地水化学特征及影响因素分析.

It is of great significance to study the characteristics of wetland water chemistry for the ecological protection and high quality development of wetland. Taking the Wetland of Sanmenxia Reservoir as a typical research area, using the sampling data of 4 times during the impoundment period and drainage period of Sanmenxia Reservoir from 2018 to 2019, the hydrochemical characteristics of the wetland of Sanmenxia Reservoir were analyzed by using hydrochemical methods such as triangle plots and Gibbs plots. The results show that the water in the wetland of Sanmenxia Reservoir is weakly alkaline, and the pH value changes little from Tongguan to Sanmenxia dam during the storage and drainage period, during the discharge period, which is influenced by Swan Lake wetland. During different periods, it shows a decreasing trend in different periods. The dilution effect of Swan Lake wetland in the drainage period is obvious; the DO, ORP, and EC contents are shown to be higher in the impoundment period than that in the drainage period. The ion concentration changes with the water level in the dam impoundment period. The ion concentration in the impoundment period is higher than that in the drainage period. The main cation is Na+, the anions are mainly HCO-3 and the water chemical type is HCO3 -SO4 -Na-Ca. Changes in hydrochemical characteristics of the wetland of Sanmenxia Reservoir are affected by the weathering of silicate rock and the dissolution of evaporative salt rock. In addition, the discharge of the municipal sewage during the impoundment period also has a significant impact on the hydrochemistry of the wetland in the reservoir area. [ABSTRACT FROM AUTHOR]