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:1672643X(2023)05005209
              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
                                       +
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                 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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