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ID:36803783
大小:2.25 MB
页数:50页
时间:2019-05-15
《河流底泥氮磷释放规律及其对环境清淤的影响研究——以南淝河为例》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、河流底泥氮磷释放规律及其对环境清淤的影响研究一以南淝河为例摘要底泥疏浚是一种治理河流内源污染比较有效的途径。为了使南淝河的疏浚方案达到应有的效果,本文重点对南淝河西二环路到潜山北路铁路桥段(研究目标段)的底泥氮磷的释放规律和环境清淤进行了初步研究。(1)对研究河段的十三个采样断面的水样和分层泥样的TN、TP进行分析测定。结果表明实验河段的河水和底泥的TP和TN含量最高。在中段的底泥垂直分布上,TP、TN中部高于顶部和底部。(2)考察不同环境条件下(pH、温度、DO、上覆水的存在形式)对底泥中氮磷释放的影响。结果表明,DO与氮
2、磷的释放呈现负相关,温度与氮磷释放强度呈现正相关,pH与磷成正相关,与氮成负相关。(3)选取研究河流中段底泥,进行了为期59天的柱状静态模拟实验,测定了各采样点在不同清淤深度下上覆河水的氮氮和溶解性总磷的平均值。关键词:南淝河底泥氮磷释放环境清淤Studyonthenitrogenandphosphorusreleaseofriver’Ssedimentandtheaffectontheecodredging—ASthecaseofNanfeiheRiverABSTRACTSedimentdredgingisalleffec
3、tivewaytocontrolpollutionfrominternalriver.InordertoachievethedesiredeffectondredgingprogramofNanfeiRiver,thispaperconductsapreliminarystudyonthetargetsectionofNanfeiRiverfromtheWestSecondRingRoadtotheRailwayBridgeinthenorthofQianshanRoad.(1)TomeasureandanalyseTNan
4、dTPinthewatersamplesandmudsampleswhicharesamplingfrom13Cross—SectionsinthetargetsectionofNanfeiRiver,theresultsshowthatTPandTNintheexperimentalsection’swatersampleandsedimentsamplearebotllhighest.Viewtheverticaldistributionofsediment,TPandTNinthemiddlearehigherthan
5、thoseatthetopandbottom.(2)Investigatetheaffectonthenitrogenreleaseofriver’Ssedimentunderthedifferentenvironmentalconditions,such嬲pH,temperature,DOandthepresenceformofoverlyingwater,theresultsshowthatDOisnegativelycorrelatedwiththenitrogenandphosphorusrelease;temper
6、atureispositivelycorrelated、析ththenitrogenandphosphorusrelease;pHispositivelycorrelatedwiththephosphorusrelease.butnegativelycorrelated、析thnitrogenrelease.(3)Selectthemiddlesectionsoftheriversediment,experimentize59daysofthecylindricalstaticsimulationexperiments,me
7、asureanddeterminetheaverageofammonianitrogenandsolublephosphorusatdifferentdredgingdepthsofallsamples.Keywords:NanfeiRiver;sediment;thenitrogenandphosphorusrelease;ecodredging插表清单表1.1生态疏浚和工程疏浚的区别⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.10表1.2生态疏浚的各项要求⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.11表2.1对采样点的标号⋯
8、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.14表2.23号采样点监测结果⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..15表2.34号采样点监测结果⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯一15表2-47点采样点监测结果⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..15表2.58号采
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