黄河“几字弯”地区风沙阻控原理及科学问题研究

打开文本图片集

Principle and Scientific Inquiry into Aeolian Sand Arresting in the Yellow River's Great Bend Region

ZHANG Hongwu

（YellowRiverResearch Center，Tsinghua University，Beijing1OOO84，China）

Abstract：InordertocurbtheseverewinderosionintheGreatBendRegionof theYelowRiverandreduceaeoliansedimentnput，this studyinvestigatedtearodyamicmechanissofsndtransportandclarifdtheundelingprciplesadsientifcisuesofsdrta tion.Turbulentvelocitydistributionformulasincorporatingbasalroughnessandconcentrationdistributionmodelstypicalofdesert environentswereapliedtanalyethewndsped，sedimentconcentration，andsandfuxduringdustevents.Thvalidationaginstfield observatinsadtheoeticalcaluatiosrevealsalearinverserelatioshipetweesdimentfuxandsurfaceroughnss，dicatigat sand-controlengineringefectivelyweakensothwinderosionintesityandsandproductionuderstrongwindsurthercalculatiosusing thresholdvelocityforulastatacountfordrageectsshowtattentrainmentthesholdfsandparticlesispositivelyrelatedtosuface roughness.Natualesetsucswitlougseitoertholdeloii，tesifgindrosioreastlf sandbarirsicreasessuaceroughess，hichsimultaneoslyisesthetrainment tresholdandeducesar-sufacewindveloityUn derthisdualeectenanedthresholdanddiminshdnargroudindspeed-thetityofoliansandisgfcantlysusdis demonstratestatthrcipleofadotrolgeinglisinireasingsuacesistaetstraindobityIncotrasoot surfacedcontroltuctureshderparticledepositoatounes，threbysupresingdneigationdexpasioasedoeprciplef minimumenergdisipationinnaturalsystems，wehaveproposedaligningsand-controllayoutsalongthemoststabledunerdgeliesMean while，theoverallconfigurationofcontrolstructures，optimizedundertheprcipleofminimumresistance，notonlymodifiesnearsurface wind fields but also exhibits multi-directional adaptability through its crest morphology.

Keywords：aiansndtrasport；sndatingegineing；suaceroughss；prnciplofmmnergdiipation；saddues; Kubuqi Desert；Yellow River’s Great Bend Region

1 研究背景与现状

1.1 区域概况及问题的提出

我国是世界上荒漠化面积最大、受影响人口最多、风沙危害最严重的国家之一。（剩余16888字）