Page 29 - 《水资源与水工程学报》2022年第4期
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! 4#         wxy, >:1956-2019 $z{&U|}~o€‚ƒ[„…./                                             2 5

                37.83% respectively,andtheoccurrencetimewas21daysahead.Itisfoundthatrainfallwaspositively
                 correlatedwithdischargewithgreatsignificance ,sotheannualdecreaseofrainfallhadseriouslyaffected
                 thedischarge.Inaddition,thevariationofhydrologicalregimesiseasilyaffectedbyPengshuiHydropow
                 erStation.However ,theimpactofthehydrologicalregimechangeandreducedflowonfishisacumula
                 tiveprocess,thespawningscaleofthe12driftingfishspeciesstartedtodecreasefrom 2009,then
                 droppeddramaticallyin2011,whichwasonlyaccountedfor15,416,900eggs.Thesefindingscanpro
                 videareferenceforthestudyofhydrologicalregimechangeprocessoftheWujiangRiverandtheformula
                 tionofwaterecologicalrestorationmeasures.
                 Keywords:hydrologicchangedegree;hydrologicalregime;IHA-RVAmethod;fishchange;theWu
                 jiangRiver
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