Handbuch des Wasserbaues

Schoklitsch, Armin

doi:10.1007/978-3-7091-4474-9

Cited by 35 publications

(12 citation statements)

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“…Accordingly, it is not necessary to directly measure or estimate either flow velocity or channel depth, one or both of which are required for calculations based on shear stress but very difficult to establish for the highly irregular geometry and high relative roughness typical of steep channels. The Schoklitsch (1962) equation is written in reduced form as…”

Section: Montane Channelsmentioning

confidence: 99%

Mountains and Montane Channels

Church

2010

Sediment Cascades

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Section: Montane Channelsmentioning

confidence: 99%

Mountains and Montane Channels

Church

2010

Sediment Cascades

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“…Under these conditions, the discharge per unit width can be used as a critical parameter. Therefore, we considered that the BREACH code can be enhanced by implementing the Schoklitsch [26] equation, which does indeed consider the discharge per unit width as a critical parameter:…”

Section: Bed-load Equationsmentioning

confidence: 99%

“…No hydraulic parameter was measured during the event along the St. Donato Creek (because it is a small river and there is no gauging station). Since the aim of this study is to evaluate the sensitivity of the model (Schoklitsch equation [26] and the percentage of boulders in the landslide body), we decided to perform the simulation using a discharge value obtained from the statistic analysis of the pluviometric data of the meteorological station of Gubbio. The data were taken since 1929 up to 1991 and, using the Bkinematic method^ [12] we were able to obtain discharge values with different return periods.…”

Section: Incoming Dischargementioning

confidence: 99%

“…With the aim of stressing the importance of choosing the correct bed-load equation, we applied both the base BREACH code model and the same model modified by the implementation of the Schoklitsch equation [26] to the Valderchia landslide dam. Implementing the Schoklitsch formula into the BREACH source code (FORTRAN) was a straightforward process.…”

Section: Application Of Breach To the Valderchia Landslide Dam Using mentioning

confidence: 99%

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Some considerations about the simulation of breach channel erosion on landslide dams

et al. 2006

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The analysis of the flood hazard related to the areas downstream of landslide dams is one of the most interesting aspects of studying the formation and the failure of natural dams. The BREACH code [14], simulating the collapse of earthen dams, both man-made and naturally formed by a landslide, was chosen in order to analyse the case of the Valderchia landslide (central Italy). The bed-load transport formula used in BREACH (Meyer-Peter and Muller, modified by Smart [27]) is based on flume experiments with well-sorted sediments. Such a methodology probably makes this equation not very suitable for describing the sediment transport peculiar to a landslide body presenting a very poor material sorting. The Schoklitsch [26] formula was implemented into the programme as an alternative to the Smart equation. However, because the landslide deposits may often have a strongly bimodal grainYsize frequency curve, the percentile D 50 (the typical granulometric parameter requested by bedload sediment transport formulas) can sometimes correspond to one of the grain-size classes which are really present to a lesser degree. To consider this phenomenon, the BREACH programme (version 7/88-1) was implemented with a new procedure that calculates two granulometric curves, one for each mode of the original distribution, and evaluates transport of the landslide material separately. Results of the analysis show that the model is very sensitive to the bed-load equation and that the procedure implemented to consider the eventual bimodal distribution of the dam material simulates the armouring phenomenon (which can stop the erosion of the dam during the overtopping phase).

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“…Because of these occurrences, flow depth and bed size material are almost of the same order of magnitude (macro-roughness condition). Many authors investigated the incipient motion for negligible or relatively small bed slopes (White, 1940;Iwagaki, 1956;Coleman, 1967;Yang, 1973), but few papers analyzed the sediment threshold in case of high slopes (Smart and Jaeggi, 1983;Schoklitsch, 1983;Bathurst et al, 1987).…”

Section: Introductionmentioning

confidence: 98%

Sediment transport on block ramp: Filling and energy recovery

2009

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The effect of sediment transport on both morphology and energy dissipation in presence of non conventional stream rehabilitation structures, such as block ramps or rock chutes, is a not well explored topic on hydraulic engineering. Namely, in normal functioning conditions, these types of structures are generally located in mountain rivers, which are characterized by an elevated sediment transport which can be deposited and trapped between the rocks constituting the ramp. This causes a change in the bed roughness and in the energy dissipation process that is present on a block ramp. This occurrence was experimentally investigated at the Hydraulic Laboratory of the University of Pisa. Different experimental conditions were tested and the main hydraulic and geometric parameters controlling the filling phenomenon and its effects were highlighted. Namely, it was experimentally proved that both the median diameters of the filling material and of the ramp blocks, the ramp slope and the discharge are the most relevant parameters governing the ramp filling. Thus, experimental formulae were derived to foresee the ramp morphological changes and the interaction between the filling process and the geometric and hydraulic parameters. Moreover a comparison of the energy dissipation on block ramp was conducted and the energy recovery in presence and absence of filling material was compared.

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Handbuch des Wasserbaues

Cited by 35 publications

References 0 publications

Mountains and Montane Channels

Mountains and Montane Channels

Some considerations about the simulation of breach channel erosion on landslide dams

Sediment transport on block ramp: Filling and energy recovery

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