La méthode hydrogéomorphologique de détermination des zones inondables

Ballais, Jean-Louis; Chave, Sylvain; Dupont, Nadia; Masson, Éric; Penven, Marie Josée

doi:10.4000/physio-geo.3307

Cited by 23 publications

(16 citation statements)

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“…Other authors have combined methods, which can yield better results because the technique can compensate for the limitations of individual methods. Notable results have been achieved, for example, by combining historical and geomorphological methods (Luino et al, 2002b) or geomorphological and hydrological methods (Chen and Simons, 1986;Townsend and Walsh, 1998;Lastra et al, 2008;Lelièvre et al, 2008;Chouari, 2009;Ballard et al, 2011) or by an approach based on historical-hydrogeomorphological reconstitution and hydrological-hydraulic modelling (Santos et al, 2011).…”

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Uncorrected land-use planning highlighted by flooding: the Alba case study (Piedmont, Italy)

Luino

Turconi

Petrea

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. Alba is a town of over 30 000 inhabitants located along the Tanaro River (Piedmont, northwestern Italy) and is famous for its wine and white truffles. Many important industries and companies are based in Alba, including the famous confectionery group Ferrero.The town suffered considerably from a flood that occurred on 5-6 November 1994. Forty-eight percent of the urban area was inundated, causing severe damage and killing nine people. After the flood, the Alba area was analysed in detail to determine the reasons for its vulnerability.Information on serious floods in this area since 1800 was gathered from official records, state technical office reports, unpublished documents in the municipal archives, and articles published in local and national newspapers. Maps, plans and aerial photographs (since 1954) were examined to reconstruct Alba's urban development over the last two centuries and the planform changes of the Tanaro River.The results were compared with the effects of the November 1994 flood, which was mapped from aerial photographs taken immediately after the flood, field surveys and eyewitness reports.The territory of Alba was subdivided into six categories: residential; public service; industrial, commercial and hotels; sports areas, utilities and standards (public gardens, parks, athletics grounds, private and public sport clubs); aggregate plants and dumps; and agriculture and riverine strip. The six categories were then grouped into three classes with different flooding-vulnerability levels according to various parameters. Using GIS, the three river corridors along the Tanaro identified by the Autorità di Bacino del Fiume Po were overlaid on the three classes to produce a final map of the risk areas.This study shows that the historic floods and their dynamics have not been duly considered in the land-use planning of Alba. The zones that were most heavily damaged in the 1994 flood were those that were frequently affected in the past and sites of more recent urbanisation. Despite recurrent severe flooding of the Tanaro River and its tributaries, areas along the riverbed and its paleochannels have been increasingly used for infrastructure and building (e.g., roads, a municipal dump, a prison, natural aggregate plants, a nomad camp), which has often interfered with the natural spread of the floodwaters. Since the 1994 flood, many remedial projects have been completed along the Tanaro and its tributaries, including levees, bank protection, concrete walls and floodway channels. In spite of these costly projects, some areas remain at high risk for flooding.The method used, which considered historical data, river corridors identified by hydraulic calculations, geomorphological aspects and land-use planning, can indicate with good accuracy flood-prone areas and in consequence to be an useful tool for the coherent planning of urban expansion and the mitigation of flood risk.

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confidence: 99%

Uncorrected land-use planning highlighted by flooding: the Alba case study (Piedmont, Italy)

Luino

Turconi

Petrea

et al. 2012

Nat. Hazards Earth Syst. Sci.

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“…The mapping approach and hydrogeomorphological analysis contribute to complement and supplement this knowledge acquired on the organization and operation of wadi environments. This objective is traditionally the hydrological and hydraulic studies whose methodologies developed for a long time under the corresponding sciences are widely used in diagnostic studies of hazard and flood risk (Ballais et. al, 2011).…”

Section: Hydrodynamic Actions In Ouerrha Wadimentioning

confidence: 99%

Bank erosion risks in Ouerrha catchment in northern Morocco: assessment and development issues

El-fengour¹,

Bateira²,

El-Fengour³

et al. 2018

Estudos Cindínicos

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“…Esse fato decorre de dois fatores diretos: primeiro a condição de rio encaixado nos sedimentos da Planície aluvial do rio Ivaí, resultado das alterações geomorfológicas e tectônicas e; segundo da inexistência de uma sazonalidade e regularidade das inundações. Ballais et al (2011), quando se referem ao estudo hidrogeomorfológico, afirmam que isso requer um conhecimento abrangente e a compreensão de um sistema complexo em que múltiplos fatores interferem, alguns naturais, outros de origem antrópica. Deve-se, portanto, analisar a modelagem hidráulica em um modelo de funcionamento geral do ambiente do rio, em que hidrologia e história de inundação são articuladas com as características físicas deste rio e do meio ambiente, não só de hoje, mas como eles evoluíram no passado e como evoluirão no futuro.…”

Section: Comunellounclassified

Cartografia das Inundações na Planície Aluvial do Rio Ivaí (Cartography of Floods in Ivaí River Alluvial Plain)

Douhi

Santos²

2018

Rev. Bras. Geog. Fis.

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Este estudo corresponde a representação cartográfica das áreas inundáveis da planície aluvial do rio Ivaí, que compreende os últimos 150 km do baixo curso do rio Ivaí até a sua confluência com o rio Paraná. Às informações se baseiam em levantamentos cartográficos, imagens de satélite, SRTM, levantamentos de campo e entrevistas aos moradores das áreas alagáveis. A metodologia adotada para a cartografia das áreas inundáveis é conhecida como "Método Hidrogeomorfológico". As informações foram agrupadas em um banco de dados no software Spring, tendo como produto final a carta das áreas inundáveis. Os resultados demonstram uma planície de inundação pouco ativa, de respostas rápidas e com forte controle das precipitações de grande intensidade, sem um padrão de cheias e vazantes. As áreas inundáveis ocupam menos de 40% da planície aluvial, mesmo nos eventos de cheia de maior magnitude. A recorrência mínima para as inundações é de 1,31 anos, porém as áreas atingidas representam apenas 1% da planície aluvial. Há poucos ambientes de integração rio-planície, reflexo das poucas áreas ativas durante as inundações e pelo forte impacto das atividades econômicas, principalmente a rizicultura e a pecuária. As informações decorrentes deste estudo representam maiores possibilidades ao planejamento e gerenciamento da planície de inundação, visando à redução dos impactos ambientais e dos riscos associados às inundações, além de um maior entendimento da dinâmica e das características dos ambientes de inundação. Palavras chave: Dinâmica Fluvial; Cartografia; Inundações; Rio Ivaí.

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La méthode hydrogéomorphologique de détermination des zones inondables

Cited by 23 publications

References 0 publications

Uncorrected land-use planning highlighted by flooding: the Alba case study (Piedmont, Italy)

Uncorrected land-use planning highlighted by flooding: the Alba case study (Piedmont, Italy)

Bank erosion risks in Ouerrha catchment in northern Morocco: assessment and development issues

Cartografia das Inundações na Planície Aluvial do Rio Ivaí (Cartography of Floods in Ivaí River Alluvial Plain)

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