Le coefficient de compacité de Gravelius: analyse critique d'un indice de forme des bassins versants

Bendjoudi, Hocine; Hubert, P.

doi:10.1080/02626660209493000

Cited by 62 publications

(30 citation statements)

References 6 publications

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“…In contrast, in a more elongated basin, lateral drainages quickly drain water into the main channel at different points resulting in a lower total discharge. The Gravelius's index K G (Gravelius, 1914;Bendjoudi and Hubert 2002), which is defined as the relation between the perimeter of the watershed (P) and that of a circle having a surface equal to that of a watershed (A) as follows:…”

Section: La Lumbre and Montegrande Watershedsmentioning

confidence: 99%

Hydrological control of large hurricane-induced lahars: evidence from rainfall-runoff modeling, seismic and video monitoring

Capra

Coviello

Borselli

et al. 2018

Nat. Hazards Earth Syst. Sci.

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Abstract. The Volcán de Colima, one of the most active volcanoes in Mexico, is commonly affected by tropical rains related to hurricanes that form over the Pacific Ocean. In 2011 hurricanes Jova, Manuel and Patricia, respectively, triggered tropical storms that deposited up to 400 mm of rain in 36 h, with maximum intensities of 50 mm h −1 . The effects were devastating, with the formation of multiple lahars along La Lumbre and Montegrande ravines, which are the most active channels in sediment delivery on the southsouthwest flank of the volcano. Deep erosion along the river channels and several marginal landslides were observed, and the arrival of block-rich flow fronts resulted in damages to bridges and paved roads in the distal reaches of the ravines. The temporal sequence of these flow events is reconstructed and analyzed using monitoring data (including video images, seismic records and rainfall data) with respect to the rainfall characteristics and the hydrologic response of the watersheds based on rainfall-runoff numerical simulation. For the studied events, lahars occurred 5-6 h after the onset of rainfall, lasted several hours and were characterized by several pulses with block-rich fronts and a maximum flow discharge of 900 m 3 s −1 . Rainfall-runoff simulations were performer using the SCS-curve number and the Green-Ampt infiltration models, providing a similar result in the detection of simulated maximum watershed peaks discharge. Results show different behavior for the arrival times of the first lahar pulses that correlate with the simulated catchment's peak discharge for La Lumbre ravine and with the peaks in rainfall intensity for Montegrande ravine. This different behavior is related to the area and shape of the two watersheds. Nevertheless, in all analyzed cases, the largest lahar pulse always corresponds with the last one and correlates with the simulated maximum peak discharge of these catchments. Data presented here show that flow pulses within a lahar are not randomly distributed in time, and they can be correlated with rainfall peak intensity and/or watershed discharge, depending on the watershed area and shape. This outcome has important implications for hazard assessment during extreme hydro-meteorological events, as it could help in providing real-time alerts. A theoretical rainfall distribution curve was designed for Volcán de Colima based on the rainfall and time distribution of hurricanes Manuel and Patricia. This can be used to run simulations using weather forecasts prior to the actual event, in order to estimate the arrival time of main lahar pulses, usually characterized by block-rich fronts, which are responsible for most of the damage to infrastructure and loss of goods and lives.

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Section: La Lumbre and Montegrande Watershedsmentioning

confidence: 99%

Hydrological control of large hurricane-induced lahars: evidence from rainfall-runoff modeling, seismic and video monitoring

Capra

Coviello

Borselli

et al. 2018

Nat. Hazards Earth Syst. Sci.

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“…River basins have also been analysed with fractal analysis. For instance, Bendjoudi and Hubert (2002) showed that the perimeters of the Danube (eastern Europe) and Seine (France) river basins are too tortuous to be scale independent. Rainfall occurrence patterns also appear to exhibit fractal features (Lovejoy and Mandelbrot, 1985;Lovejoy and Schertzer, 1985;Olsson et al, 1993;Hubert et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Fractal analysis of urban catchments and their representation in semi-distributed models: imperviousness and sewer system

Gires

Tchiguirinskaia

Schertzer

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Fractal analysis relies on scale invariance and the concept of fractal dimension enables one to characterize and quantify the space filled by a geometrical set exhibiting complex and tortuous patterns. Fractal tools have been widely used in hydrology but seldom in the specific context of urban hydrology. In this paper, fractal tools are used to analyse surface and sewer data from 10 urban or peri-urban catchments located in five European countries. The aim was to characterize urban catchment properties accounting for the complexity and inhomogeneity typical of urban water systems. Sewer system density and imperviousness (roads or buildings), represented in rasterized maps of 2 m × 2 m pixels, were analysed to quantify their fractal dimension, characteristic of scaling invariance. The results showed that both sewer density and imperviousness exhibit scale-invariant features and can be characterized with the help of fractal dimensions ranging from 1.6 to 2, depending on the catchment. In a given area consistent results were found for the two geometrical features, yielding a robust and innovative way of quantifying the level of urbanization. The representation of imperviousness in operational semi-distributed hydrological models for these catchments was also investigated by computing fractal dimensions of the geometrical sets made up of the subcatchments with coefficients of imperviousness greater than a range of thresholds. It enables one to quantify how well spatial structures of imperviousness were represented in the urban hydrological models.

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“…1(a)). In morphological terms, the watershed has a Gravelius index (Bendjoudi and Hubert 2002) and shape factor (Monsalve 1999) of 1.50 and 0.19 km km -2 , respectively. Together with the Rio Lanjarón watershed, the El Salado watershed is one of the tributaries of the River Izbor, which is connected to the Guadalfeo River.…”

Section: Salado Watershedmentioning

confidence: 99%

Runoff and sediment yield from a small watershed in southeastern Spain (Lanjarón): implications for water quality

Zuazo

Martínez

García-Tejero

et al. 2012

Hydrological Sciences Journal

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sediment yield from a small watershed in southeastern Spain (Lanjarón): implications for water quality. Hydrological Sciences Journal, 57 (8), 1610-1625. Abstract This study presents an analysis of three hydrological years (2007/08, 2008/09 and 2009/10) of precipitation, runoff and sediment yield collected from a small (669.7 ha) semi-arid watershed in southeastern Spain (Lanjarón). At the watershed outlet the runoff, suspended sediment concentration, total solute concentrations and dissolved nutrients (N-NO 3 , N-NH 4 , H 2 PO 4 and K) in streamflow were continuously monitored. The runoff was highly variable, ranging between 53.4 and 154.7 mm year -1 , with an average of 97.6 mm year -1 . In contrast, sediment yields were more regular, averaging 1.8 Mg ha -1 year -1 . The hydrological response of the watershed depended mainly on rainfall intensity. Formerly, 32% of the watershed was forested and runoff was more regular, despite the typical Mediterranean rainfall cycle; however, due to forest area reduction to 17% and the increase in abandoned farmland area (18%) in recent decades, the runoff variability has increased. Greater amounts of solutes (32.7 Mg ha -1 year -1 ) were exported, so that this water is considered as poor for irrigation use. The temporal nutrient export was related to seasonal discharge fluctuations as well as daily concentrations. In addition, the nutrient concentrations of the water discharged were lower than threshold limits cited in water-quality standards for agricultural use and for potable water, with the exception of K (65.9 mg L -1 ), which may degrade surface waters as well as irrigated soils. Thus, hydrological and erosive processes depended on the watershed features, but also on prior conditions in combination with the characteristics of rainfall episodes. Runoff and sediment yield from a small watershed in southeastern Spain 1611 qualité de l'eau pour un usage agricole ainsi que pour l'eau potable, à l'exception de K (65,9 mg L -1 ), ce qui peut dégrader les eaux de surface ainsi que les sols irrigués. Ainsi, les processus hydrologiques et érosifs dépendent des caractéristiques du bassin, mais aussi des conditions antérieures, combinées aux caractéristiques des épisodes pluvieux.

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Le coefficient de compacité de Gravelius: analyse critique d'un indice de forme des bassins versants

Cited by 62 publications

References 6 publications

Hydrological control of large hurricane-induced lahars: evidence from rainfall-runoff modeling, seismic and video monitoring

Hydrological control of large hurricane-induced lahars: evidence from rainfall-runoff modeling, seismic and video monitoring

Fractal analysis of urban catchments and their representation in semi-distributed models: imperviousness and sewer system

Runoff and sediment yield from a small watershed in southeastern Spain (Lanjarón): implications for water quality

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