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时间:2019-02-26
《三峡水库蓄水前后干流总磷浓度比较》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、J.LakeSci.(湖泊科学),2011,23(6):863-867http://www.jlakes.org.E-mail:jlakes@niglas.ac.cn2011byJournalofLakeSciences*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
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