HEC-RAS. River Analysis System systém pre analýzu prúdenia vody v riekach
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1 HEC-RAS River Aalysis System systém pre aalýzu prúdeia vody v riekach HEC Hydraulic Egieerig Corporatio združeie ižiierov pracujúcich v hydraulike Cross Sectio Subdivisio or Coveyace Calculatio Rozdeleie priečeho proilu pre výpočet modulu prietoku = K. S = A. v = AC.. R. S R / 6 C = Chezy velocity coeiciet Maig expressio. / K = A R or SI uits.486 Chézyho rýchlostý súčiiteľ Maigov tvar pre SI jedotky / K = A. R or Eglish uits pre aglické (US ) jedotky K i i A i coveyace or subdivisio modul prietoku pre časť proilu Maig s roughess coeiciet or subdivisio Maigov súčiiteľ treia pre časť proilu low area or subdivisio prietočá plocha pre časť proilu
2 R i hydraulic radius or subdivisio (area/wetted perimeter) hydraulický polomer pre časť proilu c = N i= P i P / i / c / a N a P i i i= = a=, /, P c P P i i composite equivalet coeiciet o roughess ekvivaletý súčiiteľ treia pre zložeý proil wetted perimeter o etire mai chael omočeý obvod pre celý hlavý kaál wetted perimeter o subdivisio i omočeý obvod pre časť proilu i coeiciet o roughess or subdivisio i súčiiteľ drsosti pre časť proilu i Equatio or Basic Water Surace Proiles Rovica pre eergetickú bilaciu riečeho prúdeia Beroulli equatio Beruliho rovica p α. v + g. h + ρ g = cost Datum Chael Bottom Water Surace Eergy Grade Lie zrovávacia hladia do kaála vodá hladia sklo čiary eergie
3 αv αv Y + Z + = Y + Z + + g g h e Y Z V α g h e depth o water at cross sectio hĺbka vody v proile elevatio o the mai chael iverts kóta da hlavého kaála average velocities priemerá proilová rýchlosť velocity weightig coeiciet Coriolis coeiciet koeiciet vyjadrujúci erovomeré rozložeie rýchlosti vody v proile gravitatio acceleratio koštata gravitačého zrýchleia eergy head loss straty a eergetickej výške h e = L. S α V V C α + g g L discharge weighted reach legth modiikovaá vzdialeosť medzi dvoma proilmi a základe rozdeleia prietoku
4 S C represetative rictio slope betwee sectios charakteristický sklo čiary eergie medzi dvoma proilmi expasio or cotractio loss coeiciet koeiciet strát v dôsledku rozšíreia alebo zúžeia prietočého proilu L = Llob lob + Lchch + L rob rob L lob, L ch, L rob cross sectio reach legths speciied or low i the let overbak, mai chael ad right overbak vzdialeosť prislúchajúcich častí proilov ľavej iudácie, hlavého kaála a pravej iudácie lob, ch, rob arithmetic average o the lows betwee sectio aritmetický priemer prietokov medzi prislúchajúcimi časťami proilov Evaluatio o the Mea Kietic Eergy Head Rovica pre výpočet stredej hodoty kietickej hladiy
5 V + V g α = g + V g α = A V + A V A.V α = A v. da AV. Critical depth Determiatio Určeie kritickej hĺbky Eergy Head or a cross sectio Čiara eergie pre priečy proil H αv = WS + g H WS αv g total eergy head celková hladia eergie water surace elevatio kóta hladiy velocity head rýchlostá výška
6 Supercritical Flow Superkritické prúdeie bystrié prúdeie F x = ma P P + W x F = ρδv x P W x F ρ ΔV x hydrostatic pressure orce sila spôsobeá hydraulickým tlakom orce due to the weight o water sila spôsobeá tiažou vody orce due to exteral rictio losses sila v dôsledku vokajšieho treia discharge Prietok desity o water hustota vody chage i velocity zmea v rýchlosti P = γay cos θ γay
7 γ A Y uit weight o water merá tiaž vody wetted area o the cross sectio prietočá plocha v proile depth measured rom the water surace to the cetroid o A hĺbka meraá od vodej hladiy po ťažisko plochy A W x A + A = γ Lsiθ γ A + A LS 0 L S 0 distace betwee cross sectios vzdialeosť medzi priečymi proilmi Slope o the chael sklo da kaála F = τ PL = γ RS A + A PL = γ S L R average hydraulic radius priemerý hydraulický polomer S slope o the eergy grade lie rictio slope sklo čiary eergie γ ma = g ( β V β ) V β mometum coeiciet koeiciet erovomerého rozdeleia mometu v proile Speciic Force SF Špeciická sila SF sa zachováva β A + A + AY + ga L β SF = + AY. ga β ( S ) 0 S = + A Y ga
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