三峡水库蓄水前后干流总磷浓度比较

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1、J．LakeSci．(湖泊科学)，2011，23(6):863-867http://www．jlakes．org．E-mail:jlakes@niglas．ac．cn2011byJournalofLakeSciences*三峡水库蓄水前后干流总磷浓度比较1123娄保锋，印士勇，穆宏强，张翔(1:长江流域水环境监测中心，武汉430010)(2:长江流域水资源保护局，武汉430010)(3:武汉大学水资源与水电工程科学国家重点实验室，武汉430072)摘要:为认识三峡工程蓄水对水库总磷浓度的影响，于蓄水前(1998-2002年)和蓄水后(2004-2009年)每月对三峡水库

2、干流5个断面总磷浓度进行监测并对数据进行分析．结果表明，同蓄水前相比，蓄水后水库近坝水体总磷浓度显著降低，至2009年，巴东官渡口断面和坝上太平溪断面总磷浓度比蓄水前分别下降了42．8%和54．9%;蓄水后年内总磷浓度虽然仍是丰水期＞平、枯水期，但是越近大坝，这种水期差别越小;蓄水后，库区干流总磷浓度整体上表现为从库尾至库首沿程下降，从涪陵下游的清溪场断面至坝上太平溪断面，总磷浓度下降幅度约61%-65%，尤以丰水期沿程下降最为突出．总磷浓度以上变化特征主要是由于库区水位抬高后，流速减小导致的泥沙沉降．关键词:水电工程;三峡水库;总磷;蓄水Comparisonoftota

3、lphosphorusconcentrationofYangtzeRiverwithintheThreeGorgesReservoirbeforeandafterimpoundment1123LOUBaofeng，YINShiyong，MUHongqiang＆ZHANGXiang(1:YangtzeValleyWaterEnvironmentalMonitoringCenter，Wuhan430010，P．R．China)(2:YangtzeValleyWaterResourceProtectionBureau，Wuhan430010，P．R．China)(3:State

4、KeyLaboratoryofWaterResourcesandHydropowerEngineeringScience，WuhanUniversity，Wuhan430072，P．R．China)Abstract:InordertostudytheimpactoftheThreeGorgesProjectonconcentrationoftotalphosphorus(TP)，TPconcentrationoffivesectionsinYangtzeRiverwithintheThreeGorgesReservoirwasmonitoredmonthlybetween

5、1998and2009(impoundmentbe-ganin2003)．ResultsshowedthattherehaveappearednewcharacteristicsinspatialandtemporaldistributionofTPconcentrationafterimpoundment．TPconcentrationofwatercolumnnearthedamdecreasedsignificantlycomparingwiththatbeforeimpound-ment．Forexample，theaverageTPconcentrationof

6、GuandukousectionandTaipingxisectionin2009decreasedby42．8%and54．9%thanthatbeforeimpoundment，respectively．TPconcentrationinwetseasonwasstillhigherthanthatinevenanddrysea-sons．Nearerthedam，smallerdifferencewasobservedbetweenvaluesindifferentseasons．AfterimpoundmentTPconcentrationdeclinedfrom

7、thetailtotheheadofthereservoir，anditdecreasedby61%-65%fromQingxichangsection(inthedownstreamofFuling)toTaipingxisection(nearthedam)．Thedecreasewasprominentespeciallyinwetseason．ThereasonforchangesofTPconcentrationmentionedabovewasmainlyduetosedimentationofsandinther