简介：RecentbathymetricchangesintheChangjiangEstuaryundertheinfluenceofartificialregulationengineeringsandbasinreservoirshavebeenanalyzedbasedonthemaritimechartssince1997andrecentfieldworks.Theresultsindicateaslighterosionofthechannelsintheupperandmiddleestuary,continuingdepositionandseawardmoveofthemouthbarcrestandintensifyingerosionatthenearshoreseabed.Itisnoteworthythatthemorphologicalevolutioncausedbyintensivehumanactivitiesdominatesoverthechangesfromnatureprocess.First,theriverbesareerodedoverallintheSouthBranch(SB),theSouthChannel(SC)andtheupperandmiddlereachesoftheNorthChannel(NC).Thenearshoreseabedoutsidetherivermouthisbeingerodedslightly,whichisattributedtothedecliningsedimentsupplyfromtheChangjiangBasinduetotheconstructionoftheThreeGorgesDamupstream.Thesedimentabovetheseabedisveryactiveandcoarsened,meanwhile,sandwavesarebecomingmoredistinct.Second,adepositionoccursintheNorthBrach(NB),themouthoftheNC,themouthbarsoftheNorthPassage(NP)andtheSouthPassage(SP)andespeciallythemainchanneloftheNP,whereitshowsamassivesiltationafterthedeepwaterwayproject.Thereasonsfortherecentchangesarenotonlythedynamicstructureinestuarinemouthbars,butalsothesupplyofsedimentresuspensioninalocalandoffshorearea.Meanwhile,thesevereerosionandsiltationinsomereachesisrelatedtotheconstructionofestuarineengineerings.ItisindicatedthattheChangjiangEstuaryisgraduallyself-adjustedandadaptingtothevaryingnaturalfactorsandintensivehumanactivities.Thestudyonthemechanismofself-regulationoftherecentbathymetricchangesintheChangjiangEstuaryhasimportantandpracticalsignificance.

简介：TheregulationoftheNationalSignificantSeismicMonitoringandProtectionRegions(NSSMPRforshort)isdefinedbytheLawofthePeoplesRepublicofChinaonProtectingAgainstandMitigatingEarthquakeDisasters.ThefirststageofimplementationoftheregulationofNSSMPRintheChinesemainlandwasfinishedfrom1996to2005.Thesecondstageisbeingcarriedonfrom2006to2020.WiththesupportoftheNationalSocialScienceFoundation,thispaperfollowsupandevaluatestheimplementationoftheregulationofNSSMPRfrom1996to2012intheChinesemainland.Basedonanalysisofearthquakeexamplesandinvestigationdata,wefindthattheeffectofdisastermitigationisgood,andonthisbasis,somesuggestionsareproposedtoimprovetheregulationofNSSMPR.