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Análisis de postproceso caso de modelización propia del estudio: calibration of manning's roughness in non-instrumented rural basins using a distributed hydrological model

Authors: Manchego Ramírez, William Doney;

Análisis de postproceso caso de modelización propia del estudio: calibration of manning's roughness in non-instrumented rural basins using a distributed hydrological model

Abstract

El objetivo del caso de estudio “Calibration of Manning’s roughness in non-instrumented rural basins using a distributed hydrological model” es poder aproximar un coeficiente de Manning con coberturas vegetales y de pastizales en cuencas no instrumentadas. Para esto se realizará una comparación de hidrogramas de las cuencas seleccionadas en el programa de Iber y HEC-HMS, en el cual el hidrograma a calibrar serán los obtenidos en el software de Iber, se resalta que la variación de este coeficiente permite realizar cálculos más precisos de velocidad, descarga y profundidad del agua en cada celda de discretización de la cuenca, lo que representa un hidrógrafo de salida más preciso con la realidad. Para el caso de estudio se tomaron tres cuencas con cubierta vegetal, para el valor de curvas numéricas se tomó en cuenta el uso de la tierra, las características topográficas de la zona y la condición hidrológica de la cuenca, asumiendo un valor CN de 70 y una precipitación de 75mm. De acuerdo con los resultados, en las tres cuencas se obtuvo una correlación positiva entre los coeficientes de Manning y los valores de precipitación total, siendo la mejor correlación la de la cuenca dos, debido a que en esta el coeficiente de Manning aumenta con la misma intensidad que los valores de precipitación, demostrando que aun cuando el software de HEC-HMS no es sensible a los cambios del coeficiente, si influyen en los datos de precipitación.

The objective of the case study "Calibration of Manning's roughness in non-instrumented rural basins using a distributed hydrological model" is to be able to approximate a Manning coefficient with vegetation and grassland covers in non-instrumented basins. For this, a comparison of hydrograms of the basins selected in the Iber and HEC-HMS program will be made, in which the hydrogram to be calibrated will be those obtained in the Iber software, it is highlighted that the variation of this coefficient allows more precise calculations of speed, discharge and depth of water in each discretization cell of the basin, which represents a more accurate output hydrograph with reality. For the case study, three basins with vegetation cover were taken, for the value of numerical curves the use of the land, the topographic characteristics of the area and the hydrological condition of the basin were taken into account, assuming a CN value of 70 and a precipitation of 75mm. According to the results, in the three basins a positive correlation was obtained between the Manning coefficients and the total precipitation values, the best correlation being that of basin two, because in this the Manning coefficient increases with the same intensity as the precipitation values, demonstrating that although the HEC-HMS software is not sensitive to changes in the coefficient, whether they influence precipitation data.

Magíster en Ingeniería Civil con Énfasis en Hidroambiental

Maestría

Country
Colombia
Related Organizations
Keywords

non-instrumented basin, Manning coefficient; non-instrumented basin; Modelling; Analysis., Modelling, Analysis, Manning coefficient

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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