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HECRAS Tributary Junctions “ HECRAS” - Senakadebis Se kavSireba

HECRAS Tributary Junctions “ HECRAS” - Senakadebis Se kavSireba. by G. Parodi WRS – ITC – The Netherlands g. parodi WRS-ITC- niderlandebi. Junctions- SekavSireba. Defined as two or more streams which come together or split apart .

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HECRAS Tributary Junctions “ HECRAS” - Senakadebis Se kavSireba

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  1. HECRAS Tributary Junctions“HECRAS” -SenakadebisSekavSireba by G. Parodi WRS – ITC – The Netherlands g. parodi WRS-ITC- niderlandebi

  2. Junctions- SekavSireba • Defined as two or more streams which come together or split apart. • ganisazRvreba, rogorcerTi an metiSenakadi, romlebicmoedinebianerTad an iyofian. • Constructed by drawing reaches together to a common point. Draw the line representing the tributary in the direction the water will flow (the line ends at the main stream). • igebaise, rom SenakadebierTmaneTsuerTdebodnenerT, saerTowertilSi. aageTSenakadisamsaxvelixazikalapotSiwylisdinebismimarTulebiT (SenakadisamsaxvelixazimTavrdebaZiriTadmdinaresTan). • For splitting flow, draw lines in the direction water will flow. • dinebisdanawevrebismizniTixazebaxaziwylisdinebismimarTulebiT. • Can be modeled using the energy equation or momentum equation. • SesaZlebeliamodlirebaenergiisgantolebis an momentisgantolebisgamoyenebiT.

  3. Junctions - 6 Types SekavSireba – 6 tipi • Subcritical flow - flow combining • subkritikulidineba– dinebiskombinireba • Subcritical flow - flow splitting • subkritikulidineba–dinebisdanawevreba • Supercritical flow - flow combining • superkritikulidineba – dinebiskombinireba • Supercritical flow - flow splitting • superkritikulidineba - dinebisdanawevreba • Mixed flow - flow combining • Sereulidineba – dinebiskombinireba • Mixed flow - flow splitting • Sereulidineba – dinebisdanawevreba

  4. Junctions - SekavSireba • Press the River Reach button and cursor turns to a pen. • daawkapuneTRilaksdasaxelebiT “River Reach” (“mdinarisgawvdoma”) da kursorigadaiqcevakalmad. • Hold down the left mouse button and draw in the direction of flow. • SeakaveTmausismarcxenaRilakimiWerilmdgomareobaSida mihyeviTmdinarisdinebismimarTulebas. • Release and press left mouse button to change line direction (gives shape to the schematic). • auSviT da isevdaaWireTTiTimausismarcxenaRilaksraTaSecvaloTxazismimarTuleba (vRebulobTsqematurnaxazs). • At the end of the reach double click the left mouse button. This will terminate the reach drawing. • obieqtisgamosaxvisdasamTavrebladdaawkapuneTmausismarcxenaRilaksorjer.

  5. Construction of a junctionSekavSirebisageba • Draw first the main river Reach • dasawyisisTvisdaxazeTZiriTadimdinarisgavrceleba, gawvdoma. • Draw the tributary to the proximity of the future junction. Double click to the end. • daxazeTSenakadimomavali…gadambimswertilamde, orjerdaawkapuneTprocesis bolos. • This triggers a sequence of data requirements (1 thru 4) for entering a tributary and junction • esiwvevsSesayvanimonacemebisTanmimdevrobas (1- dan 4-mde) imisTvis, rom mivuTiToTSenakadebisda SekavSirebismonacemebi.

  6. 1. The tributary request a name SenakadimoiTxovssaxels A splitting of the main river is requested. ZiriTadimdinarisdanawevreba aucilebelia 2. Select “Yes”. airCieT “ki” A name for the split river and the junction are requested dasaxelebismiwodebadanawevrebulimdinarisTvis da gadabmiswertilisTvissavaldebuloa 3. 4.

  7. Construction of a junctionSekavSirebisageba • Schematic of Blanko River with the Black Dog Creek tributary. • md.blankos da bleq dog griiqisSenakadissqematurinaxazi. • Blanko River is split between the North Branch and South Branch at jnction No. 1 • md.blankogayofilia or, Crdilo da samxreTStod, #1 kveTiswertilismeSveobiT.

  8. Junctions SekavSireba • Each of these reach lengths are entered in the Junction Data window. • yovelimocemulisegmentisgawvdomissigrZeregistrirebuliaSekavSirebiswertilismonacemTafanjaraSi. • The downstream reach length shown on the upstream cross-section data window should be set to zero. • qvedadinebisgawvdomissigrZe, romelicnaCvenebiazedadinebisganivikveTismonacemTafanjaraSiundadaviyvanoTnulamde.

  9. Junctions - Reach LengthsSekavSireba – gavrcelebissigrZe • For cross sections upstream of the junction, the reach length should be zero (in the cross section interface). • zedadinebisganivikveTisTvis(SekavSirebiswertilTanmimarTebaSi), monakveTissigrZeundaiyosnuli (ganivikveTissazRvarze). • Cross sections should be as close to the junction as possible. • ganivkveTiundaiyoSeZlebisdagvaradmaqsimaluradaxlosSemakavSirebelwertilTan. • Go into the Geometric Cross Section editor to change these lengths. • SevideTganivikveTisgeometriuliredaqcirebisganyofilebaSiobieqtebissigrZisSesacvlelad. • Distance across the junction is generally, the average distance that water will travel between cross sections across a junction. • manZiliSekavSirebiswertilisgaswvrivrogorcwesiarissaSualomanZili, romelsacwyaligaivlisganivkveTebsSorismoZraobisas, gadakveTiswertilisgaswvriv.

  10. How it should look like?rogorundagamoiyurebodessqematurianxazi? • None of the sections cut each other or overlap!! • arcerTisegmentiarundakveTdesan emTxveodeserTmaneTs. • Upstream sections (0.106 and 0.013) should have downstream reach lengths equal zero in the cross section editor. • zedadinebisseqciebs(0.106 da 0.013) undahqondeTqvedadinebisgawvdomissigrZenulistoli, ganivikveTisseqciiseditorSi. • The lengths should be stated in the junction Data that appears pressing • sigrZeundaganisazRvrosSekavSirebismonacemebSiromelicgamoCndebaRilakzedaWerisSemdeg.

  11. Junctions - Energy vs MomentumSekavSireba – energiaTumomenti Where angle of tributary can cause significant energy losses, it is more appropriate to use the momentum equation. imSemTxvevebSi, rodesacSenakadebisSeerTebiskuTxeganapirobebsenergiis did danakargs, mizanSewoniliagamoviyenoTmomentisgantoleba. No angle is entered for the reach that is part of the mainstream if there is no angle between themainstream reaches u.s. and d.s. of the tributary. kuTxesarvuTiTebTgawvdomisTvis, romelicarisZiriTadimdinarisnawili, TuargvaqvsmocemulikuTxeZiriTadimdinariszeda da qvedadinebasSoris.

  12. Junctions - SekavSireba or, point the mouse at the junction, left click and select “Edit Junction”. an, miuTiTeTmausiTRilaki “JUNCT”, SekavSireba, mausismarcxenaRilakzedaWeriTairCieTredaqtirebisfunqcia “Edit Junction’’.

  13. Junctions - Split FlowsSekavSireba – danawevrebulidineba • For split flows, i.e. when the stream is divided or split apart in the downstream direction, the program can optimize the amount of flow going in each direction. • gayofilinakadebisTvis, magaliTadrodesacnakadiiyofaqvedadinebismimarTulebiT, programasSeuZliawylisraodenobisoptimizaciaorivemimarTulebiT. • The user must estimate the initial flows going in each direction. It only is available for steady flow analysis. • momxmarebelmaundagansazRvrossawyisiraodenobayovelimimarTulebisTvis. esSesaZlebeliamxoloducvlelidinebisanalizisdros.

  14. Junctions - Split FlowsSekavSireba – danawevrebulidineba The optimization is found under the steady flow analysis window . optimizacisfunqciaSegviZliavixiloTTanabaridinebisfanjrisCamoSlisas.

  15. Junctions - Cross Section Locations SekavSireba – ganivikveTebismdebareoba • 3 Criteria for XS’s near junctions: • 3 kriteriumiXS-ismimdebareSekavSirebisTvis: • Locate them close to junction. Another cross section may be transferred if representative. • ganaTavseTisiniSekavSirebiswertilTanaxlos. sxvaganivikveTaSeiZlebagadavaadgiloTTu is aristipobrivi, damaxasiaTebeli. • Cross-Sections should not overlap (the ends may touch upstream of junction for example). • ganivikveTebiarundaemTxveodnenerTmaneTs(ganivikveTisboloebi, SeiZlebaexebodnenzedadinebasmagaliTisTvis). • Should be located where flow is essentially one-dimensional. • undamdebareobdneniq, sadacdinebaarsebiTaderTimimarTulebiTxasiaTdeba.

  16. End of lecture leqciisdasasruli

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