2017年1月上旬泰国南部暴雨反复发生机制的研究（英文）-豆柴文库

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2017年1月上旬泰国南部暴雨反复发生机制的研究（英文）
ResearchontheMechanismofRepeatedOccurrenceofHeavyRaininSouthernThailandinEarlyJanuary2017
Introduction
InearlyJanuary2017,Thailand’ssouthernregionwasbatteredbyheavyrainsanddevastatingfloods,causingwidespreaddestructionandlossoflife.Theregionwasexperiencingrepeated,intenserainstormswithrapidlyrisingwaterlevels,makingresponseandrescueeffortsextremelychallenging.Inordertounderstandthemeteorologicalfactorsthatcontributedtothisextremeevent,thispaperprovidesananalysisofthemechanismofrepeatedoccurrenceofheavyraininsouthernThailandinearlyJanuary2017.
MeteorologicalBackground
ThesouthernregionofThailand,consistingof14provinces,islocatedinatropicalclimatezone,wherethemonsoonseasonlastsfromMaytoOctober.Duringthisseason,thesouthwestmonsoonbringsheavyrainstotheregion,whilethenortheastmonsoonusuallyprevailsduringthedryseason.However,inearlyJanuary2017,adisturbanceintheupperatmosphereovertheBayofBengalledtotheformationofalow-pressuresystemthatmovedtowardstheThailandcoast.ThiswasaccompaniedbytheflowofmoistairfromtheIndianOcean,resultinginheavyrainfallintheregion.
RainfallCharacteristics
FromJanuary1toJanuary6,morethan1000mmofrainfallwasrecordedinsomepartsofsouthernThailand,whichwasequivalenttotheaverageannualrainfallintheregion.Thedailyrainfalltotalinsomeplacesexceeded300mm,whichwasbeyondthecapacityofthedrainagesystemandledtoflooding.TheheaviestrainfalloccurredintheprovincesofSuratThani,NakhonSiThammarat,andPhatthalung,causingflashfloodsandlandslidesthatdestroyedhomes,buildings,andtransportationinfrastructure.
MeteorologicalAnalysis
Duringthisperiod,theaffectedregionwasundertheinfluenceoftwomajormeteorologicalsystems:thelow-pressuretroughintheupperatmosphereandtheenhancednortheastmonsoon.Thelow-pressuresystembroughtmoisture-ladenairtotheregion,whichinteractedwithcoldanddryairfromthenortheastmonsoon.Thisinteractioncreatedasharptemperaturegradient,leadingtotheformationofthunderstormsandheavyprecipitation.Furthermore,theupper-levelwindpatternsresultedinthe