Channel bed-steps along Nahal Yael, Negev desert, Israel

Wohl, Ellen; Grodek, Tamir

doi:10.1016/0169-555x(94)90070-1

Cited by 105 publications

(83 citation statements)

References 8 publications

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“…Relation between basin area and bedrock channel width was studied by Montgomery and Gran (2001) while Kobor and Roering (2004) performed study on basin area and channel slope of rivers over rocks. Miller (1991), Wohl et al (1994), Seidl et al (1996), Righter (1997), Seidl (1997, 1998), Wohl andIkeda (1998), Wohl (2000), Wohl andMerritt (2001), wohl andAchyuthan (2002) contributed valuable work on knick points. Erosion rates in natural bedrock channels have been measured by Foley (1980), Smith et al (1995), Righter (1997), Hancock et al (1998), Tinkler and Parish (1998), Whipple et al (2000b), Wohl and Achyuthan (2002), Kale and Joshi (2004), Reusser et al (2004).…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Parameters and Morphometric Variables Interactions in Bedrock Channel

Biswas¹,

Das²

2016

Quaestiones Geographicae

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Biswas B., das B. C., 2016. Hydraulic parameters and morphometric variables interactions in bedrock channel. Quaestiones Geographicae 35(3), Bogucki Wydawnictwo Naukowe, Poznań, pp. 75-88, 12 figs.aBstraCt: Present study is on the interdependent nature of hydraulic parameters and morphometric variables of a bedrock river. In this study, using dumpy level, GPS, satellite images and some mathematical equations a data set on hydraulics and morphometric variables of a bedrock channel, named Bhatajhor, of eastern India was generated. That data set was used to (1) find out impulse-response relations between hydraulic variables (2) find out relations between morphometric variables and (3) find out relations between hydraulic and morphometric variables. Seven equations (5-11) were formulated based on this empirical study to the end. The seven empirical relations, most of which include only two variables, involve channel cross-section dimensions (area, width, mean depth, maximum depth, width/ depth ratio, hydraulic radius), slope and hydraulic variables (velocity, kinetic energy, stream power, Manning's n factor, Chezy's C factor and shear stress). Observation shows relatively higher coefficient of determination (R2) between variables like velocity and Manning's n factor (0.67), velocity and Chezy's C factor (0.67), slope and τ (0.89), w/d ratio and hydraulic radius (0.53), slope and w/d ratio (0.50).

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Section: Introductionmentioning

confidence: 99%

Hydraulic Parameters and Morphometric Variables Interactions in Bedrock Channel

Biswas¹,

Das²

2016

Quaestiones Geographicae

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“…The results also show a declining tendency of c values when slope increased, derived from the shape of the ODI curve (reduced interval width for low DN corresponding to high slopes). It is worth noting that the combination of input parameters S, q and z was totally random, whereas in nature usually certain relationships between geomorphological factors are verified, such as increasing discharges or decreasing step heights for decreasing slopes (Wohl and Grodek, 1994;Chin, 1999). On the other hand, no experimental data fell inside the region of small c (between 1 and 2) and low slope values (under 4 %) predicted by the model.…”

Section: Exploring the Relationships With Step-pool Unitsmentioning

confidence: 90%

A conceptual model of check dam hydraulics for gully control: efficiency, optimal spacing and relation with step-pools

Castillo

Pérez

Gómez

2014

Hydrol. Earth Syst. Sci.

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Abstract. There is little information in scientific literature regarding the modifications induced by check dam systems in flow regimes within restored gully reaches, despite it being a crucial issue for the design of gully restoration measures. Here, we develop a conceptual model to classify flow regimes in straight rectangular channels for initial and damfilling conditions as well as a method of estimating efficiency in order to provide design guidelines. The model integrates several previous mathematical approaches for assessing the main processes involved (hydraulic jump, impact flow, gradually varied flows). Ten main classifications of flow regimes were identified, producing similar results when compared with the IBER model. An interval for optimal energy dissipation (ODI) was observed when the steepness factor c was plotted against the design number (DN, ratio between the height and the product of slope and critical depth). The ODI was characterized by maximum energy dissipation and total influence conditions. Our findings support the hypothesis of a maximum flow resistance principle valid for a range of spacing rather than for a unique configuration. A value of c = 1 and DN ∼ 100 was found to economically meet the ODI conditions throughout the different sedimentation stages of the structure. When our model was applied using the same parameters to the range typical of step-pool systems, the predicted results fell within a similar region to that observed in field experiments. The conceptual model helps to explain the spacing frequency distribution as well as the often-cited trend to lower c for increasing slopes in step-pool systems. This reinforces the hypothesis of a close link between stable configurations of step-pool units and man-made interventions through check dams.

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“…Una comparación de las denomina ciones y clasificaciones propuestas ha sido efectuada por algunos investigadores (Grant, 1994;Rosport, Dittrich, 1995;Montgomery, Buffing-ton, 1997) y sintetizada por D'Agostino, Lenzi (1997). Algunos autores (Judd, Peterson, 1969 ;Hayward, 1980;Heede, 1981 ;Whittaker, 1987;Chin, 1989;Grant y otros, 1990;Grant, 1994;Wohl, Grodek, 1994) observaron que la longitud media de los step (Ls) relativa a una secuencia, está ligada a la pendiente del lecho a través de una relación del tipo…”

Section: Introductionunclassified

Morfología y estabilidad de las secuencias en escalones (step pool) en los torrentes alpinos de elevada pendiente

Lenzi

1999

ing.agua

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RESUMEN: Abrahams y otros (1995) Los escalones en roca y los formados por troncos de árboles se diferencian de los escalones-rápidos y de bloques por una marcada irregularidad en la interdistancia (longitud de onda, Ls, Figura 1a) según la cual se repiten a lo largo del perfil longitudinal del fondo del torrente. Tienen también una mayor probabilidad de desarrollarse en modo aislado, en vez de ordenarse en secuencias regulares y bien organizadas, como en cambio sucede en el caso de los escalones de bloques (Lenzi y D'Agostino, 1998).Las secuencias de rápidas y remansos han sido estudiadas por diferentes autores en función de sus relaciones con la granulometría del lecho, el ancho y la profundidad media del flujo, el tipo y la modalidad de transporte sólido (Leopold y otros, 1964;Yang, 1971;Richards, 1976Richards, ,1978Keller, Melhorn, 1978;Milne, 1982). En cambio, no tan claras resultan las diferenciaciones y clasificaciones propuestas para la morfología en escalones 1 Dipartimento Territorio e Sistemi Agroforestali, Università di Padova, Agripolis, 35020 Legnaro (PD), Italia e-mail: lenzi@agripolis.unipd.it Artículo publicado en Ingeniería del Agua. Vol. 6 Num.2 (junio 1999), páginas 151-162, recibido el 7 de octubre de 1998 y aceptado para su publicación el 5 de mayo de 1999. Pueden ser remitidas discusiones sobre el artículo hasta seis meses después de la publicación del mismo. En el caso de ser aceptadas, las discusiones serán publicadas conjuntamente con la respuesta de los autores en el primer número de la revista que aparezca una vez transcurrido el plazo indicado.

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Channel bed-steps along Nahal Yael, Negev desert, Israel

Cited by 105 publications

References 8 publications

Hydraulic Parameters and Morphometric Variables Interactions in Bedrock Channel

Hydraulic Parameters and Morphometric Variables Interactions in Bedrock Channel

A conceptual model of check dam hydraulics for gully control: efficiency, optimal spacing and relation with step-pools

Morfología y estabilidad de las secuencias en escalones (step pool) en los torrentes alpinos de elevada pendiente

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