Channel degradation and slope adjustment in steep streams controlled through bed sills

Vide, Juan Pedro Martín; Andreatta, A.

doi:10.1002/esp.1687

Cited by 28 publications

(17 citation statements)

References 20 publications

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“…In these cases, we measured each undercutting depth both above and below the sill’s crest. Uncertainties of the undercutting measurements were estimated to be 0.5 m. It is difficult to evaluate the exact effect of the sills quantitatively; however, the bed would suffer more degradation without the sills10.…”

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confidence: 99%

Dramatic undercutting of piedmont rivers after the 2008 Wenchuan Ms 8.0 Earthquake

Fan

Nie

Wang

et al. 2016

Sci Rep

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Changes in river channel erosion or deposition affect the geomorphic evolution, aquatic ecosystems, and river regulation strategies. Fluvial processes are determined by the flow, sediment and boundary conditions, and it has long been expected that increasing sediment supply will induce aggradation. Here, based on thorough field surveys, we show the unexpected undercutting of the piedmont rivers influenced by the 2008 Wenchuan (Ms 8.0) Earthquake. The rivers flow from the Longmen Mountain with significant topographic relief to the flat Chengdu plain. In the upstreams, sediment supply increased because of the landslides triggered by the earthquake, causing deposition in the upstream mountain reaches. However, the downstream plain reaches suffered undercutting instead of deposition, and among those rivers, Shiting River was the most seriously affected, with the largest undercutting depth exceeding 20 m. The reasons for this unexpected undercutting are proposed herein and relate to both natural and anthropogenic causes. In addition, we also demonstrate, at least for certain conditions, such as rivers flowing from large-gradient mountain regions to low-gradient plain regions, that upstream sediment pulses may induce aggradation in upstream and degradation in downstream, causing the longitudinal profile to steepen to accommodate the increasing sediment flux.

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confidence: 99%

Dramatic undercutting of piedmont rivers after the 2008 Wenchuan Ms 8.0 Earthquake

Fan

Nie

Wang

et al. 2016

Sci Rep

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“…Y ello a pesar de que el desarrollo actual de la geomorfología fluvial española es muy destacable, apoyándose en grupos de investigación muy activos que se dedican a temáticas diversas. En los Pirineos y Cataluña se trabaja especialmente en el análisis de procesos y en las consecuencias de la regulación hidrológica en los cauces (García Ruiz et al, 2010, 2011Sanjuán et al, 2014;Batalla et al, 2004;Vericat y Batalla, 2010;Batalla y Vericat, 2011Batalla et al, 2014), incluyendo aportaciones de ingenieros fluviales (Martín Vide y Andreatta (2008), Martín Vide et al, 2010Ferrer-Boix, 2010). En Valencia y Murcia hay valiosas aportaciones al estudio de las ramblas mediterráneas (Mateu, 2000;Segura y Sanchis, 2013;Conesa y García Lorenzo, 2009) y en Andalucía a la dinámica fluvial asociada a elementos históricos y usos del suelo (Guerrero y Baena, 2002;García Martínez et al, 2009).…”

Section: Iii3 La Geomorfología Fluvial En El Siglo XXIunclassified

Sobre la evolución como ciencia de la geomorfología dinámica en ambientes fluviales

Horacio¹

2017

BAGE

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RESUMENSe presenta un análisis histórico-evolutivo de la geomorfología dinámica en ambientes fluviales. El objetivo del estudio se centra en organizar los hechos temporales pasados que han ido confeccionando el cuerpo de lo que actualmente es esta ciencia. La línea del tiempo establecida se estructura en diferentes etapas, cada una de las cuales se define por unas características propias que derivan en una forma concreta de practicar y concebir la ciencia. Dicha línea del tiempo actúa también como guía y argumento en la lectura del texto.Palabras clave: geomorfología fluvial, antecedentes, historia, ciencia, evolución. ABSTRACTThis paper analyses the history and development of fluvial geomorphology in dynamic environments. The goal of the study is to organize the past events that have been making up the body of what this science is now. The established timeline is divided into different stages, each of which is defined by its own characteristics resulting in a particular way to conceive of and practice science; the timeline also serves to guide the reading of this text.

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“…It can induce general scour at the foundations of instream structures and destabilize riverbanks, threatening the security of both the public and private properties [16]. Grade control structures (GCSs) such as submerged weirs, bed sills and check dams are common countermeasures for bed degradation [9][10][11][17][18][19]. They can raise the upstream water level and reduce the flow capacity for sediment transport, preventing the upstream river bed from being excessively degraded.…”

Section: Introductionmentioning

confidence: 99%

“…The local scours at GCSs have been extensively studied and many empirical equations have been proposed [8,[10][11][12][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. Some studies also investigated the impacts of GCSs on the river bed profile [17,18]. Although very important, no studies have investigated the effects of GCS failure (i.e., GCD drop) on the upstream river reach.…”

Section: Introductionmentioning

confidence: 99%

Case Study: Model Test on the Effects of Grade Control Datum Drop on the Upstream Bed Morphology in Shiting River

Wang

Nie

et al. 2019

Water

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This paper conducted an undistorted scaled model test (geometric scale λL = 1:80; the others are derived scales based on Froude similitude) of a 1.3 km-long river reach in Shiting River, China, investigating the impacts of the grade control datum (GCD, defined as the crest elevation of the grade control structure) drop on the upstream bed morphology. Three GCDs and six flood events (occurrence probability 1–50%, discharge = 600–4039 m3/s) were tested on the model. Experimental results indicate that, for a constant GCD, the increase in discharge deepens and widens the upstream river bed. For a lower GCD, the increase in channel depth and width caused by the increasing discharge is greater. For each discharge, the decrease in GCD induces a lower and steeper upstream river bed, widening the upstream main channel. For lower discharge, the GCD drop induces a head cut erosion area upstream of the grade control structure and the head cut erosion area is filled by the upstream sediment when the flow discharge is high. Experimental data also indicate that the maximum general scour depth at the 105th Provincial Highway Bridge is approximately independent of discharge for a constant GCD. For a lower GCD, the general scour depth at the 105th Provincial Highway Bridge increases slightly with discharge.

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Channel degradation and slope adjustment in steep streams controlled through bed sills

Cited by 28 publications

References 20 publications

Dramatic undercutting of piedmont rivers after the 2008 Wenchuan Ms 8.0 Earthquake

Dramatic undercutting of piedmont rivers after the 2008 Wenchuan Ms 8.0 Earthquake

Sobre la evolución como ciencia de la geomorfología dinámica en ambientes fluviales

Case Study: Model Test on the Effects of Grade Control Datum Drop on the Upstream Bed Morphology in Shiting River

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