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Amethodforcalculatingdrainageflowinintermittentimprovedsubsurfacepipes
1,2
1
1,2
JINMingrui,TAOYuan ,WANGShaoli ,GUANXiaoyan 1,2
(1.ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100048,China;
2.NationalCenterofEfficientIrrigationEngineeringandTechnologyResearch - Beijing,Beijing 100048,China)
Abstract:Toaddresstheissuesoffrequentwaterloggingdisastersinthefieldandthescarcityofarablelandre
sources,anintermittentimprovedsubsurfacepipedrainagestructurewasproposed,whichoffersalargerdrainage
flowandoccupieslessfarmland.Ingeneral ,theconventionalsubsurfacepipecanbesimplifiedtotwo - dimensional
calculation ,buttheintermittentimprovedsubsurfacepipehasthree - dimensionalseepagearoundthecylindersand
filterintheprocessofdrainage ,formingarelativecomplexspatialseepagestructure.Bycombiningthedrainage
formulaofShaJinxuanpartiallypenetratingwellandthedrainageformulaofconventionalsubsurfacepipe ,asim
plifiedmethodforcalculatingintermittentimprovedsubsurfacepipedrainageflowintheabsenceofsurfacewater
wasgiven.FieldexperimentswerecombinedwithHYDRUSnumericalsimulationstoverifytheresults ,andthe
flowproportionofeachpartinthedrainageprocesswasanalyzed.Theresultsshowthatthetheoreticalcalculation
methodforintermittentimprovedsubsurfacepipeflowisreasonableandfeasible ,andtheaveragerelativeerrorbe
tweenthetheoreticalcalculationandthemeasuredvalueandthesimulatedvalueis6.97% and- 2.84%,respec
tively.Withtheincreaseindrainagetime,theproportionofinternaldrainageflowtototalflowinthecylindrical
sandfiltergraduallydecreased ,whiletheproportionofexternalinletflowtothetotalflowcontinuouslyincreased.
Thehigherthecylindricalsandfiltermaterialis ,thelongertheinternaldrainagedurationis,thesmallerthespac
ingofthecylindersandfiltermaterial,thegreatertheproportionofthesumofinternaldrainageandexternalinlet
flowtothetotalflow.Thediscontinuousimprovedmethodforcalculatingsubsurfacepipedrainageflowissuitable
forbothloamandsilt.Theresearchresultsprovideideasandreferencestoenrichthedrainagetheoryofagricultural
landandtheconstructionofsubsurfacepipeprojects.
Keywords:intermittentimprovedsubsurfacepipe;cylindersandfilter;drainageflow;HYDRUS
(责任编辑:王 婧)
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