Page 56 - 《水资源与水工程学报》2023年第5期
P. 56
! 34 " ! 5 # & ' ( ) & * + , - Vol.34No.5
2023 $ 10 % JournalofWaterResources&WaterEngineering Oct.,2023
DOI:10.11705/j.issn.1672-643X.2023.05.06
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EFGHI:X523 JK7LM:A JNOI:1672643X(2023)05005209
Characteristicsandsourcesofchemicalcomponentsingroundwateralongthe
Le ’anRiverofJiangxiProvinceunderanextremefloodevent
2
3
1,2
WEIXinxiang ,YANGZhoubailu,XUNaizheng
(1.SchoolofWaterResourcesandEnvironmentalEngineering,EastChinaUniversityofTechnology,Nanchang330013,China;
2.DepartmentofHydraulicEngineering,JiangxiWaterResourcesInstitute,Nanchang330013,China;
3.NanjingCenter,ChinaGeologicalSurvey,Nanjing210016,China)
Abstract:Inordertostudythesourcesofgroundwaterchemicalcomponentsandtheenvironmental
healthrisksalongtheLe’anRiverinLepingCityundertheeffectofanextremefloodevent,22parame
tersof24groupsofshallowgroundwatersamplescollectedduringandafteranextremefloodwereana
lyzedbythecombinationofgraphicalmethod ,mathematicalstatisticsandmainionratio.Theresults
showthatthereisnosignificantdifferenceinthemainchemicalcomponentsofgroundwaterindifferent
-
periods ,andallthesamplesaretestedtobeweakacidicfreshwaterwithlowsalinity,withHCO ,
3
+
2-
+
2+
SO ,Ca ,Na andK asthedominantanionsandcations.Thespatialdistributionofgroundwater
4
chemicaltypesissignificantlydifferntiated ,whichismainlyHCO -Ca·NaandHCO·SO -Ca·Na
4
3
3
typesduringthefloodperiod,andClandNO typesinthepostfloodperiod.Theformationofthemain
3
chemicalcomponentsofgroundwaterismainlycontrolledbythewater-rockinteraction,thedissolution
ofsilicatemineralsandthecationalternatingadsorption.Inadditon ,somelocalareasarealsoaffectedby
humanactivitessuchasagriculturalfertilization ,sewagedischarge.Aftertheflood,thegroundwater
qualityisdegraded ,whichisnologersuitablefordrinking.Themainpollutantsareammonianitrogen,
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