HECRAS Tributary Junctions HECRAS Senakadebis Sekav Sireba by
HECRAS Tributary Junctions “HECRAS” - Senakadebis Sekav. Sireba by G. Parodi WRS – ITC – The Netherlands g. parodi WRS-ITC- niderlandebi ITC Faculty of Geo-Information Science and Earth Observation of the University of Twente
Junctions- Sekav. Sireba § Defined as two or more streams which come together or split apart. § ganisaz. Rvreba, rogorc er. Ti an meti Senakadi, romlebic moedinebian er. Tad 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). § igeba ise, rom Senakadebi er. Tmane. Ts uer. Tdebodnen er. T, saer. To wertil. Si. aage. T Senakadis amsaxveli xazi kalapot. Si wylis dinebis mimar. Tulebi. T (Senakadis amsaxveli xazi m. Tavrdeba Ziri. Tad mdinares. Tan). § For splitting flow, draw lines in the direction water will flow. § dinebis danawevrebis mizni. T ixazeba xazi wylis dinebis mimar. Tulebi. T. § Can be modeled using the energy equation or momentum equation § Sesa. Zlebelia modlireba energiis gantolebis an momentis gantolebis gamoyenebi. T. .
Junctions - 6 Types Sekav. Sireba – 6 tipi 1. 2. Subcritical flow - flow combining subkritikuli dineba – dinebis kombinireba 3. 4. Subcritical flow - flow splitting subkritikuli dineba –dinebis danawevreba 5. 6. Supercritical flow - flow combining superkritikuli dineba – dinebis kombinireba 7. 8. Supercritical flow - flow splitting superkritikuli dineba - dinebis danawevreba 9. 10. Mixed flow - flow combining Sereuli dineba – dinebis kombinireba 11. Mixed flow - flow splitting 12. Sereuli dineba – dinebis danawevreba
Junctions - Sekav. Sireba § § § Press the River Reach button and cursor turns to a pen. daawkapune. T Rilaks dasaxelebi. T “River Reach” (“mdinaris gawvdoma”) da kursori gadaiqceva kalmad. Hold down the left mouse button and draw in the direction of flow. Seakave. T mausis marcxena Rilaki mi. Weril mdgomareoba. Si da mihyevi. T mdinaris dinebis mimar. Tulebas. Release and press left mouse button to change line direction (gives shape to the schematic). au. Svi. T da isev daa. Wire. T Ti. Ti mausis marcxena Rilaks ra. Ta Secvalo. T xazis mimar. Tuleba (v. Rebulob. T sqematur naxazs). § At the end of the reach double click the left mouse button. This will terminate the reach drawing. § obieqtis gamosaxvis dasam. Tavreblad daawkapune. T mausis marcxena Rilaks orjer.
Construction of a junction Sekav. Sirebis ageba § § Draw first the main river Reach dasawyisis. Tvis daxaze. T Ziri. Tadi mdinaris gavrceleba, gawvdoma. § Draw the tributary to the proximity of the future junction. Double click to the end. daxaze. T Senakadi momavali…gadambims wertilamde, orjer daawkapune. T procesis bolos. § § § This triggers a sequence of data requirements (1 thru 4) for entering a tributary and junction es iwvevs Sesayvani monacemebis Tanmimdevrobas (1 dan 4 -mde) imis. Tvis, rom mivu. Ti. To. T Senakadebis da Sekav. Sirebis monacemebi.
1. The tributary request a name Senakadi moi. Txovs saxels 2. 3. A name for the split river and the junction are requested dasaxelebis miwodeba danawevrebuli mdinaris. Tvis da gadabmis wertilis. Tvis savaldebuloa A splitting of the main river is requested. Ziri. Tadi mdinaris danawevreba aucilebelia Select “Yes”. air. Cie. T “ki” 4.
Construction of a junction Sekav. Sirebis ageba § Schematic of Blanko River with § the Black Dog Creek tributary. md. blankos da bleq dog griiqis Senakadis sqematuri naxazi. § Blanko River is split between the North Branch and South § Branch at jnction No. 1 md. blanko gayofilia or, Crdilo da samxre. T Stod, #1 kve. Tis wertilis me. Sveobi. T.
Junctions Sekav. Sireba § Each of these reach lengths are entered in the Junction § Data window. yoveli mocemuli segmentis gawvdomis sigr. Ze registrirebulia Sekav. Sirebis wertilis monacem. Ta fanjara. Si. § The downstream reach length shown on the upstream crosssection data window should be § set to zero. qveda dinebis gawvdomis sigr. Ze, romelic na. Cvenebia zeda dinebis ganivi kve. Tis monacem. Ta fanjara. Si unda daviyvano. T nulamde.
Junctions - Reach Lengths Sekav. Sireba – gavrcelebis sigr. Ze § For cross sections upstream of the junction, the reach length should be zero (in the cross § section interface). zeda dinebis ganivi kve. Tis. Tvis (Sekav. Sirebis wertil. Tan mimar. Teba. Si), monakve. Tis sigr. Ze unda iyos nuli (ganivi kve. Tis saz. Rvarze). § § Cross sections should be as close to the junction as possible. ganiv kve. Ti unda iyo Se. Zlebisdagvarad maqsimalurad axlos Semakav. Sirebel wertil. Tan. § § Go into the Geometric Cross Section editor to change these lengths. Sevide. T ganivi kve. Tis geometriuli redaqcirebis ganyofileba. Si obieqtebis sigr. Zis Sesacvlelad. § Distance across the junction is generally, the average distance that water will travel between § cross sections across a junction. man. Zili Sekav. Sirebis wertilis gaswvriv rogorc wesi aris sa. Sualo man. Zili, romelsac wyali gaivlis ganiv kve. Tebs Soris mo. Zraobisas, gadakve. Tis wertilis gaswvriv.
How it should look like? rogor unda gamoiyurebodes sqematuri anxazi ? § § None of the sections cut each other or overlap!! arcer. Ti segmenti ar unda kve. Tdes an em. Txveodes er. Tmane. Ts. § Upstream sections (0. 106 and 0. 013) should have downstream reach lengths equal zero in the cross section editor. zeda dinebis seqciebs (0. 106 da 0. 013) unda hqonde. T qveda dinebis gawvdomis sigr. Ze nulis toli, ganivi kve. Tis seqciis editor. Si. § § § The lengths should be stated in the junction Data that appears pressing sigr. Ze unda ganisaz. Rvros Sekav. Sirebis monacemeb. Si romelic gamo. Cndeba Rilakze da. Weris Semdeg.
Junctions - Energy vs Momentum Sekav. Sireba – energia Tu momenti Where angle of tributary can cause significant energy losses, it is more appropriate to use the momentum equation. im Sem. Txveveb. Si, rodesac Senakadebis Seer. Tebis ku. Txe ganapirobebs energiis did danakargs, mizan. Sewonilia gamoviyeno. T momentis gantoleba. No angle is entered for the reach that is part of the mainstream if there is no angle between the mainstream reaches u. s. and d. s. of the tributary. ku. Txes ar vu. Ti. Teb. T gawvdomis. Tvis, romelic aris Ziri. Tadi mdinaris nawili, Tu ar gvaqvs mocemuli ku. Txe Ziri. Tadi mdinaris zeda da qveda dinebas Soris.
Junctions - Sekav. Sireba or, point the mouse at the junction, left click and select “Edit Junction”. an, miu. Ti. Te. T mausi. T Rilaki “JUNCT”, Sekav. Sireba, mausis marcxena Rilakze da. Weri. T air. Cie. T redaqtirebis funqcia “Edit Junction’’.
Junctions - Split Flows Sekav. Sireba – danawevrebuli dineba § 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. gayofili nakadebis. Tvis, magali. Tad rodesac nakadi iyofa qveda dinebis mimar. Tulebi. T, programas Seu. Zlia wylis raodenobis optimizacia orive mimar. Tulebi. T. § The user must estimate the initial flows going in each direction. It only is § available for steady flow analysis. momxmarebelma unda gansaz. Rvros sawyisi raodenoba yoveli mimar. Tulebis. Tvis. es Sesa. Zlebelia mxolod ucvleli dinebis analizis dros.
Junctions - Split Flows Sekav. Sireba – danawevrebuli dineba The optimization is found under the steady flow analysis window. optimizacis funqcia Segvi. Zlia vixilo. T Tanabari dinebis fanjris Camo. Slisas.
Junctions - Cross Section Locations Sekav. Sireba – ganivi kve. Tebis mdebareoba § § 3 Criteria for XS’s near junctions: 3 kriteriumi XS-is mimdebare Sekav. Sirebis. Tvis: § Locate them close to junction. Another cross section may be transferred if § representative. gana. Tavse. T isini Sekav. Sirebis wertil. Tan axlos. sxva ganivi kve. Ta Sei. Zleba gadavaadgilo. T Tu is aris tipobrivi, damaxasia. Tebeli. § Cross-Sections should not overlap (the ends may touch upstream of junction for § example). ganivi kve. Tebi ar unda em. Txveodnen er. Tmane. Ts (ganivi kve. Tis boloebi, Sei. Zleba exebodnen zeda dinebas magali. Tis. Tvis). § § Should be located where flow is essentially one-dimensional. unda mdebareobdnen iq, sadac dineba arsebi. Tad er. Ti mimar. Tulebi. T xasia. Tdeba.
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