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In fluid dynamics, the conjugate depths refer to the depth (''y''1) upstream and the depth (''y''2) downstream of the hydraulic jump whose momentum fluxes are equal for a given discharge (volume flux) ''q''. The depth upstream of a hydraulic jump is always supercritical. It is important to note that the conjugate depth is different from the alternate depths for flow which are used in energy conservation calculations. ==Mathematical derivation== Beginning with an equal momentum flux ''M'' and discharge ''q'' upstream and downstream of the hydraulic jump: : Rearranging terms gives: : Multiply to get a common denominator on the left-hand side and factor the right-hand side: : The (''y''2−''y''1) term cancels out: : Divide by ''y''12 : Thereafter multiply by ''y''2 and expand the right hand side: : Substitute ''x'' for the constant ''y''2/''y''1: : Solving the quadratic equation and multiplying it by gives: : Substitute the constant ''y''2/''y''1 back in for ''x'' to get the conjugate depth equation : 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Conjugate depth」の詳細全文を読む スポンサード リンク
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