一种新型的微润灌溉系统水力特性与试验研究

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1、万方数据太原理工大学硕士研究生学位论文HYDRAULICCHARACTERISTICSANDE×PERIN旺!NTALSTUDYOFANEWTYPEOFMICRO．IRRJ(讼TIONSYSTEMABSl№～CTShortageinwaterresourcehasbeenthecommonissuesconcemedbywholeworld．InordertosavewaterresourcemoreeffectivelySOastogrowoutmorefoodbyusingthelimitedwaterresource，andmeanw

2、hile，facingwiththegrowingproblemofwaterandsoilerosionandlanddesertificationinnorthwesternregionsofChina，ahighlyefficientwater-savingirrigationisbadlyneededtoalleviatetheworseningcrisis．ThispaperpresentsanewSelf-suctionMicro-irrigation．Theresearchresultsareobtainedasfollowi

3、ng：detectingtheproductionofself-suctionmicro-irrigation，depthanalysisofself-suctionmicro-irrigation’Sinfluencingfactors，buildingself-suctionmicro—irrigationsysteminfieldtoirrigatecotton，andcomingupwithsomeproblemsexistinthesystemandresearchdirectionoffuture．Thereareinducti

4、onperiodexistineffluentofmoistube，andtheinductiontimeis21hours．Afterthis，therelationshipbetweenaccumulatedseepageandtimeiSlinear．Astimebecomesincreased，moistube’Stimeintervalflowtendstoincrease，andwhentheflowbecomesstable，itwillgoupanddowndependingonaverageofflowovertime，w

5、hichissimilartothedailyvariationofairtemperature．Givingthefittingbetweenflowandpressure，obtainstheIII万方数据太原理工大学硕士研究生学位论文curvilinearequation：a=93．00Hof81．Thedeviationfactorscausedbymoistubeareallwithin9％，andexperiment’Smaterialsreachagoodgrade．Theflowoflmand2mhydraulicheads

6、correlatessignificantwithwatertemperatureinO．O1level，andthetwocasesshowpositivecorrelation．Whenwatertemperaturerises，theflowincreases，andwhenwatertemperaturereduces，theflowdecreases．Therelationshipbetweenmoistube’Sflowandwatertemperatureislinear．Whentemperaturechanges1℃，th

7、evariationofflow：lmwaterpressurecorresponds5．89ml，and2mwaterpressurecorresponds9．26ml，whichindicatesthatthegreaterhydraulichead，thelargerimpactthetemperatureonflow．Therelationshipbetweenmoistube’Spressureandflowisexponentialrelationship，andflowindexisbiggerthan0．5．Differen

8、ttimeofobservation’Swettingfrontshapeissimilartoacircleusedbymicro—irrigationzoneasthecen