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Copyright of Acta Médica Peruana is the property of Colegio Medico del Peru and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Science & Technology in Ocular Health & Vision / Ciencia y Tecnología para la Salud Visual y Ocular is the property of Ciencia y Tecnologia para la Salud Visual y Ocular and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A non-stationary model is shown, formed by the 1D hyperbolic differential equation, which is commonly used in practice for wave propagation of rivers and channels. As an upstream boundary condition, a function that depends on time has been taken, representing the variation of the water levels in the channel. Downstream, the wave equation with first derivatives in space and time is taken as the boundary condition, thus ensuring that there is no reflection of the wave in that boundary. Numerical algorithms obtained from the application of the Finite Differences Method and the Finite Element Method are formulated and the calculation algorithms are compared with an analytical solution showing good results. [ABSTRACT FROM AUTHOR]