抚河南昌段水化学特征及影响分析

Hydrochemical Characteristics and Impact Analysis of Nanchang Section of Fuhe River

于2019年12月和2020年6月在抚河南昌段分别采集了地表水样31个和地下水样11个,对水体中的9种离子(K^(+)、Ca^(2+)、Na^(+)、Mg^(2+)、Cl^(-)、SO_(4)^(2-)、HCO_(3)^(-)、CO_(3)^(2-)、NO_(3)^(-))、pH及TDS进行了测定,运用统计分析、Piper三线图、Gibbs图及水质评价进行水化学特征、控制因素及灌溉适宜性分析。结果表明:各离子含量和pH受季节影响明显,枯水期和丰水期阴、阳离子分别以HCO_(3)^(-)和Ca^(2+)为主;枯水期各离子变异系数较大,空间差异性大于丰水期;水化学类型主要为Ca·Na-HCO_(3)^(-),地表水和地下水之间水力联系密切且转化频繁;水化学控制因素以岩石风化为主,但在丰水期具有向大气降水控制型过渡的趋势;不同离子参数间整体具有显著相关性;适宜性评价结果整体为优良,丰水期优于枯水期。

A total of 31 surface water samples and 11 groundwater samples were collected in Nanchang section of the Fuhe River in December 2019 and June 2020 respectively,and concentration of nine ions(K^(+),Ca ^(2+),Na^(+),Mg ^(2+),Cl^(-),SO_(4)^(2-),HCO_(3)^(-),CO_(3)^(2-),NO_(3)^(-)),pH value and TDS in water bodies were measured.Statistical analysis,Piper three-line diagram,Gibbs diagram and water quality evaluation were applied to study the water chemistry characteristics,control factors and irrigation suitability.The results show that the ion content and pH value are significantly affected by the season,and HCO_(3)^(-),Ca ^(2+)is the main anion and cation respectively both in dry period and wet period.The coefficients of variation of each ion are larger in the dry period than that in wet period,and it indicates the spatial variability of each ion is greater in dry period than in wet period.The water hydrochemical type is mainly Ca·Na-HCO_(3)^(-),and the hydraulic connection between surface water and groundwater is close and frequent.The water chemistry is mainly controlled by rock weathering,but there is a trend of transition to atmospheric precipitation control during the wet period.The overall correlation between different ionic parameters is significant.The suitability evaluation results are excellent and good overall,and the wet water period is better than that in the dry period.