简介：Thisarticlegivesareviewonheavymetalpollutionpreventionandcontrol,anditalsodiscussesheavymetalpollutantdischarge,predictionandevaluationofenvironmentalimpact,andpollutionpreventionandmonitoring.

简介：Thispaperpresentsalaboratorystudyonbridgepierprotectionwithsurfaceguidepanels(SGP)inclear-waterexperiments.TheSGPisinstalledbypiercingasetoftwoverticalpanelspartiallyintothewater,withsomeinteriorangleandleadingopening,settingatadistanceaheadoftheprotectedpier.ThesuitableinstallationoftheSGPcaneffectivelyadjusttheflowpatterntoreducethedownflowmotionandthehorseshoevortexaheadofthepier.WeconsidersomedominantfactorstosetupSGPforpierprotection,includingtheinteriorangleθ,leadingopeningOw,distancebetweenpanelandpierL,submergeddepthofpanelPd,pierdiameterDandwaterdepthH.Afterevaluationoftheseparametersthroughlaboratorytests,theoptimalsetupconditionsofθ=60o,Ow/D=0.1～0.2,L/D=2～2.5andPd/H=0.7aredetermined.Undertheseconditions,theusageofSGPleadstoabestperformanceondecrementofthemaximumscourdepthatpierupto90%withignorablesideeffectsontheSGPscour.

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简介：各种各样的方法被建议到在桥墩附近搜索的控制。在现在的学习，独自一个的在和在和领子的联合的申请试验性地被检验为在圆柱的桥墩附近搜索控制。测试与七种在尺寸并且与领子的二种不同尺寸被进行。实验方程有或没有领子保护为墩的二格为稳定的在直径被开发。在层的程度也为这二格被介绍。结果在b/dR=7.5的范围显示出那(在b是的地方，墩直径和医生是在尺寸)使用一个领子减少了稳定的在尺寸。使用领子在前面减少了在层延期，这也被结束并且墩站在一起。