Page 28 - 《水资源与水工程学报》2022年第4期
P. 28

!33 " ! 4 #                       & ' ( ) & * + , -                               Vol.33No.4
               2022 $ 8 %               JournalofWaterResources&WaterEngineering                 Aug.,2022

            DOI:10.11705/j.issn.1672-643X.2022.04.04


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                 FGHIJ:TV12;P339   KLMNO:A    KPQJ:1672643X(2022)04002408
                           Hydrologicalregimechangeanditsinfluenceonfishin

                                        WujiangRiverfrom1956to2019

                               GUHongmei,ZHUZhipeng,WANGHongxiang,GUOWenxian
                           (NorthChinaUniversityofWaterResourcesandElectricPower,Zhengzhou450045,China)
                 Abstract:Waterflowchangesleadtochangesinriverecohydrologicalregime,andthenaffectthehealth
                 ofriverecosystems.InordertoclarifytheeffectsofhydrologicalterationsonfishhabitatintheWujiang
                 Rivermainstream ,dailyflowdatafrom1956to2019andspawningdataof12driftingfishspeciesfrom
                2009to2015wereselectedfrom therecordintheWulongHydrologicalStation.TheMann-Kendall
                 (M-K)testandthecumulativeanomalymethodwereusedtostudytheabruptchangesintheWujiang
                 Rivermainstream,inordertoanalyzethechangetrendofdailyflowbeforeandaftertheabruptchanges.
                 Thenthecharacteristicsandchangedegreeof32setsofhydrologicalindexeswereevaluatedusingindica
                 torsofhydrologicalteration-rangeofvariabilityapproach (IHA-RVA)method,soastostudythefish
                 populationchangeprocessunderthechangeofhydrologicalregimes.Theresultsshowthattheabrupt
                 changeintheWujiangRiverflowoccurredin2009 ,whichisthesameastheoperationtimeofPengshui
                 HydropowerStation.Aftertheabruptchange ,theaveragedailypeakflowfluctuatedaround15,000
                                               3
                  3
                 m /s,whichwascloseto18,000m /s,thedailypeakflowbeforetheabruptchange.Furthermore,the
                 overallchangedegreeof32setsofhydrologicalindexeswas38.7%,whichfellintothemoderaterange.
                 Thedurationandfrequencyoflowflowwithhighchangerangewere74.64% and75.29% respectively ,
                 andtheoccurrencetimewasdelayedby4days;whereasthoseofthehighflow was29.79% and

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