Dépouillements

Improving the evaluation of hydrological multi-model forecast performance in the upper danube catchment / K. Bogner in JRBM : International journal of river basin management, Vol. 10 N° 1 (Janvier 2012) 

Public ISBD [article]  in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 1-12 Titre : Improving the evaluation of hydrological multi-model forecast performance in the upper danube catchment Type de document : texte imprimé Auteurs : K. Bogner, Auteur ; H. L. Cloke, Auteur ; F. Pappenberger, Auteur Année de publication : 2012 Article en page(s) : pp. 1-12 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Floods  Forecasting  Quality  Verification  Cost-loss Résumé : Medium range flood forecasting activities, driven by various meteorological forecasts ranging from high resolution deterministic forecasts to low spatial resolution ensemble prediction systems, share a major challenge in the appropriateness and design of performance measures. In this paper possible limitations of some traditional hydrological and meteorological prediction quality and verification measures are identified. Some simple modifications are applied in order to circumvent the problem of the autocorrelation dominating river discharge time-series and in order to create a benchmark model enabling the decision makers to evaluate the forecast quality and the model quality. Although the performance period is quite short the advantage of a simple cost-loss function as a measure of forecast quality can be demonstrated. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2011.625359 [article] Improving the evaluation of hydrological multi-model forecast performance in the upper danube catchment [texte imprimé] / K. Bogner, Auteur ; H. L. Cloke, Auteur ; F. Pappenberger, Auteur . - 2012 . - pp. 1-12. Hydraulique Langues : Anglais (eng) in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 1-12 Mots-clés : Floods  Forecasting  Quality  Verification  Cost-loss Résumé : Medium range flood forecasting activities, driven by various meteorological forecasts ranging from high resolution deterministic forecasts to low spatial resolution ensemble prediction systems, share a major challenge in the appropriateness and design of performance measures. In this paper possible limitations of some traditional hydrological and meteorological prediction quality and verification measures are identified. Some simple modifications are applied in order to circumvent the problem of the autocorrelation dominating river discharge time-series and in order to create a benchmark model enabling the decision makers to evaluate the forecast quality and the model quality. Although the performance period is quite short the advantage of a simple cost-loss function as a measure of forecast quality can be demonstrated. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2011.625359

Modifying dam operating rules to deliver environmental flows / Cate Brown in JRBM : International journal of river basin management, Vol. 10 N° 1 (Janvier 2012) 

Public ISBD [article]  in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 13-28 Titre : Modifying dam operating rules to deliver environmental flows : Experiences from southern Africa Type de document : texte imprimé Auteurs : Cate Brown, Auteur ; Jackie King, Auteur Année de publication : 2012 Article en page(s) : pp. 13-28 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Environmental  flows  Dams  Operating  rules  Sustainable  development Résumé : Provision for environmental flows (EFs) in water use and water-resource developments has been legislated in several southern and eastern African countries. While much of the focus has been on the assessment of EFs for new water-resource developments, some attention has been paid to the possibilities of modifying the operation of existing infrastructure to deliver EFs. This paper summarizes research done to support the re-operation of the Katse Dam in Lesotho, the Clanwilliam and Kogelberg Dams in South Africa, the Cahora Bassa Dam in Mozambique and the Nyumba ya Munga Dam in Tanzania in ways that would reduce their downstream impacts. For each, the original and suggested new operating rules are presented, and the reasons for the suggested changes are summarized. The negotiation and decision-making processes relevant to each dam are also discussed, and some of the challenges faced at two of the dams (Katse and Kogelberg), where revised operating rules have been implemented, are reviewed. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2011.639304 [article] Modifying dam operating rules to deliver environmental flows : Experiences from southern Africa [texte imprimé] / Cate Brown, Auteur ; Jackie King, Auteur . - 2012 . - pp. 13-28. Hydraulique Langues : Anglais (eng) in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 13-28 Mots-clés : Environmental  flows  Dams  Operating  rules  Sustainable  development Résumé : Provision for environmental flows (EFs) in water use and water-resource developments has been legislated in several southern and eastern African countries. While much of the focus has been on the assessment of EFs for new water-resource developments, some attention has been paid to the possibilities of modifying the operation of existing infrastructure to deliver EFs. This paper summarizes research done to support the re-operation of the Katse Dam in Lesotho, the Clanwilliam and Kogelberg Dams in South Africa, the Cahora Bassa Dam in Mozambique and the Nyumba ya Munga Dam in Tanzania in ways that would reduce their downstream impacts. For each, the original and suggested new operating rules are presented, and the reasons for the suggested changes are summarized. The negotiation and decision-making processes relevant to each dam are also discussed, and some of the challenges faced at two of the dams (Katse and Kogelberg), where revised operating rules have been implemented, are reviewed. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2011.639304

What river morphology after restoration? / Andrea Nardini in JRBM : International journal of river basin management, Vol. 10 N° 1 (Janvier 2012) 

Public ISBD [article]  in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 29-47 Titre : What river morphology after restoration? : The methodology VALURI Type de document : texte imprimé Auteurs : Andrea Nardini, Auteur ; Sara Pavan, Auteur Année de publication : 2012 Article en page(s) : pp. 29-47 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : River  management  River  restoration  Hydro-morphological  risk  assessment  Environmental  cost–benefit  analysis  Integrated  evaluation  Po-river  basin  (Italy) Résumé : This paper proposes a tool which river managers may need to ascertain whether the key idea of River Restoration is valid, i.e. that rivers in more natural status are desirable not only for pure environmental reasons, but also to combat flood and geomorphic risk. The point addressed is how to predict the morphology and geometry that a river will assume after the application of a River Restoration project which foresees significant changes in the system of defence and exploitation works as well as morphological adjustments (e.g. reconnection of an incised main channel with the surrounding ex-floodplain). To this aim we developed a semi-quantitative methodology that integrates several differing criteria: from historical analysis of geomorphic evolution, expert-based mechanistic reasoning, checking with empirical qualitative formulas and analytical support from fluvial geomorphology and classic hydraulics. The development of the methodology has taken place on a case study along the 80 km of Chiese River, downstream of Idro lake, in northern Italy. Although the product to be considered is just a pilot one, we see it as a promising tool, which also opens several challenging questions suited for further fascinating research work. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2011.640637 [article] What river morphology after restoration? : The methodology VALURI [texte imprimé] / Andrea Nardini, Auteur ; Sara Pavan, Auteur . - 2012 . - pp. 29-47. Hydraulique Langues : Anglais (eng) in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 29-47 Mots-clés : River  management  River  restoration  Hydro-morphological  risk  assessment  Environmental  cost–benefit  analysis  Integrated  evaluation  Po-river  basin  (Italy) Résumé : This paper proposes a tool which river managers may need to ascertain whether the key idea of River Restoration is valid, i.e. that rivers in more natural status are desirable not only for pure environmental reasons, but also to combat flood and geomorphic risk. The point addressed is how to predict the morphology and geometry that a river will assume after the application of a River Restoration project which foresees significant changes in the system of defence and exploitation works as well as morphological adjustments (e.g. reconnection of an incised main channel with the surrounding ex-floodplain). To this aim we developed a semi-quantitative methodology that integrates several differing criteria: from historical analysis of geomorphic evolution, expert-based mechanistic reasoning, checking with empirical qualitative formulas and analytical support from fluvial geomorphology and classic hydraulics. The development of the methodology has taken place on a case study along the 80 km of Chiese River, downstream of Idro lake, in northern Italy. Although the product to be considered is just a pilot one, we see it as a promising tool, which also opens several challenging questions suited for further fascinating research work. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2011.640637

Integrated basin management for the ganges / Mosharefa Shahjahan in JRBM : International journal of river basin management, Vol. 10 N° 1 (Janvier 2012) 

Public ISBD [article]  in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 49-64 Titre : Integrated basin management for the ganges : Challenges and opportunities Type de document : texte imprimé Auteurs : Mosharefa Shahjahan, Auteur ; Nick Harvey, Auteur Année de publication : 2012 Article en page(s) : pp. 49-64 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Integrated  river  basin  management  Transboundary  rivers  The  Ganges  basin  Cooperation  Basin-wide  planning  and  basin  organization Résumé : Integrated river basin management (IRBM) emphasizes the need for managing the river as a system irrespective of administrative boundaries. Although IRBM is being adopted for many trans-boundary rivers, progress can be slow, particularly where there is a history of dispute. The Ganges basin in South Asia is one such case that experienced numerous conflicts over water between the riparian states, notably between India and Bangladesh. The power imbalance between states, mistrust and antagonism, prevailing national interest over the regional benefit, and most importantly lack of an effective institutional mechanism contributed to the complexity of implementing IRBM in the Ganges context. Despite these challenges, there is a consensus about the significant benefits that could be gained through multilateral regional cooperation over water. This paper analyses the challenges of multilateral cooperation towards IRBM in the Ganges context and examines the scope for overcoming these challenges. The paper argues that IRBM in the Ganges context depends on cooperation towards a basin-wide management approach, and a basin organization is a prerequisite to that. It suggests creation of a basin organization in the Ganges context by sharing experiences from other parts of the world and concludes with a framework for adopting IRBM in the Ganges basin. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2011.644853 [article] Integrated basin management for the ganges : Challenges and opportunities [texte imprimé] / Mosharefa Shahjahan, Auteur ; Nick Harvey, Auteur . - 2012 . - pp. 49-64. Hydraulique Langues : Anglais (eng) in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 49-64 Mots-clés : Integrated  river  basin  management  Transboundary  rivers  The  Ganges  basin  Cooperation  Basin-wide  planning  and  basin  organization Résumé : Integrated river basin management (IRBM) emphasizes the need for managing the river as a system irrespective of administrative boundaries. Although IRBM is being adopted for many trans-boundary rivers, progress can be slow, particularly where there is a history of dispute. The Ganges basin in South Asia is one such case that experienced numerous conflicts over water between the riparian states, notably between India and Bangladesh. The power imbalance between states, mistrust and antagonism, prevailing national interest over the regional benefit, and most importantly lack of an effective institutional mechanism contributed to the complexity of implementing IRBM in the Ganges context. Despite these challenges, there is a consensus about the significant benefits that could be gained through multilateral regional cooperation over water. This paper analyses the challenges of multilateral cooperation towards IRBM in the Ganges context and examines the scope for overcoming these challenges. The paper argues that IRBM in the Ganges context depends on cooperation towards a basin-wide management approach, and a basin organization is a prerequisite to that. It suggests creation of a basin organization in the Ganges context by sharing experiences from other parts of the world and concludes with a framework for adopting IRBM in the Ganges basin. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2011.644853

Optimization of the flood protection effect of a hydropower multi-reservoir system / Frédéric M. Jordan in JRBM : International journal of river basin management, Vol. 10 N° 1 (Janvier 2012) 

Public ISBD [article]  in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 65-72 Titre : Optimization of the flood protection effect of a hydropower multi-reservoir system Type de document : texte imprimé Auteurs : Frédéric M. Jordan, Auteur ; Boillat, Jean-Louis, Auteur ; Anton J. Schleiss, Auteur Année de publication : 2012 Article en page(s) : pp. 65-72 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Flood  risk  management  Multi-reservoir  systems  Preventive  operation  of  hydropower  schemes  Flood  forecast Résumé : The use of existing hydroelectricity multi-reservoir systems for flood protection may be an efficient approach in many catchment areas. The assessment of the protection potential offered by the hydropower plants during floods requires a comprehensive analysis of the catchment area, including the simulation of flood scenarios. A methodology for the optimization of turbine and bottom outlet operations of multi-reservoir systems during floods is presented. Based on a theoretical catchment configuration, the most relevant parameters in view of reducing of the peak flows in rivers located downstream of the reservoirs are analysed in a systematic way with the help of hydrological forecasts. The influence of the drained areas, the installed turbine capacities, the emergency rules and the location of the reservoirs on the flood control in such a complex catchment area is highlighted. The optimization approach is applied in the Upper Rhone River basin in Switzerland, where 10 major hydropower schemes with large reservoirs are located. The results regarding peak flow reduction at the catchment outlet are in good agreement with the theoretical values obtained with the developed methodology. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2011.650868 [article] Optimization of the flood protection effect of a hydropower multi-reservoir system [texte imprimé] / Frédéric M. Jordan, Auteur ; Boillat, Jean-Louis, Auteur ; Anton J. Schleiss, Auteur . - 2012 . - pp. 65-72. Hydraulique Langues : Anglais (eng) in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 65-72 Mots-clés : Flood  risk  management  Multi-reservoir  systems  Preventive  operation  of  hydropower  schemes  Flood  forecast Résumé : The use of existing hydroelectricity multi-reservoir systems for flood protection may be an efficient approach in many catchment areas. The assessment of the protection potential offered by the hydropower plants during floods requires a comprehensive analysis of the catchment area, including the simulation of flood scenarios. A methodology for the optimization of turbine and bottom outlet operations of multi-reservoir systems during floods is presented. Based on a theoretical catchment configuration, the most relevant parameters in view of reducing of the peak flows in rivers located downstream of the reservoirs are analysed in a systematic way with the help of hydrological forecasts. The influence of the drained areas, the installed turbine capacities, the emergency rules and the location of the reservoirs on the flood control in such a complex catchment area is highlighted. The optimization approach is applied in the Upper Rhone River basin in Switzerland, where 10 major hydropower schemes with large reservoirs are located. The results regarding peak flow reduction at the catchment outlet are in good agreement with the theoretical values obtained with the developed methodology. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2011.650868

Environmental and livelihood impacts of dams / Marcus W. Beck in JRBM : International journal of river basin management, Vol. 10 N° 1 (Janvier 2012) 

Public ISBD [article]  in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 73-92 Titre : Environmental and livelihood impacts of dams : Common lessons across development gradients that challenge sustainability Type de document : texte imprimé Auteurs : Marcus W. Beck, Auteur ; Andrea H. Claassen, Auteur ; Peter J. Hundt, Auteur Année de publication : 2012 Article en page(s) : pp. 73-92 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Dam  Environment  Livelihood  USA  China  Southeast  Asia Résumé : The economic benefits of dams have been assumed to outweigh the costs, thus providing rationale for construction of dams around the world. However, the development of these structures can be accompanied by negative biophysical, socio-economic, and geopolitical impacts; often through the loss of ecosystem services provided by fully functioning aquatic systems. Moreover, impacts of dams can be involuntarily imposed on marginalized peoples whose livelihoods are dependent on riverine resources. In this review, we examine the impacts of dam projects in regions of the world that are at different stages of development, using the USA, China, and Southeast Asia to represent a development gradient from developed to developing, respectively. Case studies for each region illustrate the environmental and livelihood impacts of dams in each region, while also providing a basis to better understand how environmental degradation is directly related to economic growth. We conclude that a distinct temporal component related to development mediates the relationship between policies and governance mechanisms and the mitigation of environmental and social costs of dams. The role of affected individuals to influence the political will behind dam projects and the importance of environmental advocacy is emphasized as a fundamental approach towards more sustainable development. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.656133 [article] Environmental and livelihood impacts of dams : Common lessons across development gradients that challenge sustainability [texte imprimé] / Marcus W. Beck, Auteur ; Andrea H. Claassen, Auteur ; Peter J. Hundt, Auteur . - 2012 . - pp. 73-92. Hydraulique Langues : Anglais (eng) in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 73-92 Mots-clés : Dam  Environment  Livelihood  USA  China  Southeast  Asia Résumé : The economic benefits of dams have been assumed to outweigh the costs, thus providing rationale for construction of dams around the world. However, the development of these structures can be accompanied by negative biophysical, socio-economic, and geopolitical impacts; often through the loss of ecosystem services provided by fully functioning aquatic systems. Moreover, impacts of dams can be involuntarily imposed on marginalized peoples whose livelihoods are dependent on riverine resources. In this review, we examine the impacts of dam projects in regions of the world that are at different stages of development, using the USA, China, and Southeast Asia to represent a development gradient from developed to developing, respectively. Case studies for each region illustrate the environmental and livelihood impacts of dams in each region, while also providing a basis to better understand how environmental degradation is directly related to economic growth. We conclude that a distinct temporal component related to development mediates the relationship between policies and governance mechanisms and the mitigation of environmental and social costs of dams. The role of affected individuals to influence the political will behind dam projects and the importance of environmental advocacy is emphasized as a fundamental approach towards more sustainable development. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.656133

Hydraulic suitability of an innovative fish passage design / Maruf Mortula in JRBM : International journal of river basin management, Vol. 10 N° 1 (Janvier 2012) 

Public ISBD [article]  in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 93-102 Titre : Hydraulic suitability of an innovative fish passage design Type de document : texte imprimé Auteurs : Maruf Mortula, Auteur ; Serter Atabay, Auteur Année de publication : 2012 Article en page(s) : pp. 93-102 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Water  surface  profile  Velocity  profile  Fish  passage-way  Hydraulic  structure  and  numerical  model Résumé : An innovative hydraulic structure consisting of identical cell was proposed for fish passage-way in surface water. The objective of this paper was to simulate a single cell of the proposed fishway to find suitability against Atlantic fish species. The numerical model used for this hydraulic structure was developed to simulate the water surface profiles and longitudinal velocity through one cell. The model was run with an upstream depth of 0.3–0.9 m with an increment of 0.1 m. The depths arising from analysis of the hypothetical prototypes were found to be adequate for most fish species investigated. The velocities were found to be reasonable for most fish species. Although the model did not always provide preferable velocities, the species considered can cope with the high velocity using their burst speed capabilities. The cell thus provides acceptable hydraulic conditions for fish to travel both longitudinally and laterally. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.663382 [article] Hydraulic suitability of an innovative fish passage design [texte imprimé] / Maruf Mortula, Auteur ; Serter Atabay, Auteur . - 2012 . - pp. 93-102. Hydraulique Langues : Anglais (eng) in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 93-102 Mots-clés : Water  surface  profile  Velocity  profile  Fish  passage-way  Hydraulic  structure  and  numerical  model Résumé : An innovative hydraulic structure consisting of identical cell was proposed for fish passage-way in surface water. The objective of this paper was to simulate a single cell of the proposed fishway to find suitability against Atlantic fish species. The numerical model used for this hydraulic structure was developed to simulate the water surface profiles and longitudinal velocity through one cell. The model was run with an upstream depth of 0.3–0.9 m with an increment of 0.1 m. The depths arising from analysis of the hypothetical prototypes were found to be adequate for most fish species investigated. The velocities were found to be reasonable for most fish species. Although the model did not always provide preferable velocities, the species considered can cope with the high velocity using their burst speed capabilities. The cell thus provides acceptable hydraulic conditions for fish to travel both longitudinally and laterally. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.663382

Climate change impact on flood hazard, vulnerability and risk of the Long Xuyen Quadrangle in the Mekong Delta / Q. Dinh in JRBM : International journal of river basin management, Vol. 10 N° 1 (Janvier 2012) 

Public ISBD [article]  in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 103-120 Titre : Climate change impact on flood hazard, vulnerability and risk of the Long Xuyen Quadrangle in the Mekong Delta Type de document : texte imprimé Auteurs : Q. Dinh, Auteur ; S. Balica, Auteur ; I. Popescu, Auteur Année de publication : 2012 Article en page(s) : pp. 103-120 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Flood  modelling  Vietnamese  mekong  delta  Flood  hazard  Flood  vulnerability  Flood  risk  Climate  change Résumé : The Vietnamese Mekong Delta (VMD) has an important role in terms of food security and socio-economic development of the region; however, it is one of many areas of the world vulnerable to floods resulting from sea level rise (SLR) due to climate change. Therefore, management of flooding is a priority at national and regional levels in Vietnam. The Long Xuyen Quadrangle is the most important region in the VMD in terms of agriculture and economy. In the present work, flood hazard, vulnerability and risk were assessed and mapped to identify the priority areas in the Long Xuyen Quadrangle for flood mitigation. A hydrodynamic model was used to simulate the flood event of 2000 when a flood of 20-year return period occurred and caused loss of human lives and extensive damage. The calibrated model was then used to simulate a possible flood event in 2050 due to SLR. The resulting flood depth of the simulation was used to prepare inundation maps and to analyse flood hazard in this region, as well. The flood vulnerability of the region was assessed using the coastal areas flood vulnerability index (FVI) method. The FVI was determined by district, and flood vulnerability maps were developed based on these data. The results indicate that the major part of the study area (35.4%) can be classified as being at high risk. It was also found that 32.7% of the area is under medium risk and only about 18.4% is under very low and low risk; 10.2% of the total area is not subjected to flood risk. We show that district level flood vulnerability maps are potentially useful for decision makers and the public in planning better measures for adaptation and mitigation of the negative impacts of flooding. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.663383 [article] Climate change impact on flood hazard, vulnerability and risk of the Long Xuyen Quadrangle in the Mekong Delta [texte imprimé] / Q. Dinh, Auteur ; S. Balica, Auteur ; I. Popescu, Auteur . - 2012 . - pp. 103-120. Hydraulique Langues : Anglais (eng) in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 103-120 Mots-clés : Flood  modelling  Vietnamese  mekong  delta  Flood  hazard  Flood  vulnerability  Flood  risk  Climate  change Résumé : The Vietnamese Mekong Delta (VMD) has an important role in terms of food security and socio-economic development of the region; however, it is one of many areas of the world vulnerable to floods resulting from sea level rise (SLR) due to climate change. Therefore, management of flooding is a priority at national and regional levels in Vietnam. The Long Xuyen Quadrangle is the most important region in the VMD in terms of agriculture and economy. In the present work, flood hazard, vulnerability and risk were assessed and mapped to identify the priority areas in the Long Xuyen Quadrangle for flood mitigation. A hydrodynamic model was used to simulate the flood event of 2000 when a flood of 20-year return period occurred and caused loss of human lives and extensive damage. The calibrated model was then used to simulate a possible flood event in 2050 due to SLR. The resulting flood depth of the simulation was used to prepare inundation maps and to analyse flood hazard in this region, as well. The flood vulnerability of the region was assessed using the coastal areas flood vulnerability index (FVI) method. The FVI was determined by district, and flood vulnerability maps were developed based on these data. The results indicate that the major part of the study area (35.4%) can be classified as being at high risk. It was also found that 32.7% of the area is under medium risk and only about 18.4% is under very low and low risk; 10.2% of the total area is not subjected to flood risk. We show that district level flood vulnerability maps are potentially useful for decision makers and the public in planning better measures for adaptation and mitigation of the negative impacts of flooding. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.663383

Multiple water use as an approach for increased basin productivity and improved adaptation / Nidhi Nagabhatla in JRBM : International journal of river basin management, Vol. 10 N° 1 (Janvier 2012) 

Public ISBD [article]  in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 121-136 Titre : Multiple water use as an approach for increased basin productivity and improved adaptation : A case study from Bangladesh Type de document : texte imprimé Auteurs : Nidhi Nagabhatla, Auteur ; Malcolm Beveridge, Auteur ; A. B.M. Mahfuzul Haque, Auteur Année de publication : 2012 Article en page(s) : pp. 121-136 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Seasonal  floodplain  Basin  Water  management  Bangladesh  Multiple  water  use  Adaptation Résumé : This study, supported by the Challenge Program Water and Food (CPWF-Project 35), demonstrates the case of multiple-use of water through seasonal aquaculture interventions for improved rice–fish production systems in the Bangladesh floodplains. The project focused on community-based fish culture initiatives, increasingly adopted in the agro-ecological zones of the major floodplains of the Padma, Testa, and Brahmaputra basin. The productivity of water and fish is used as an indicator to explain this case. We hypothesize that seasonal aquaculture supported by the management of floodplains for multiple-use of water can significantly increase the productivity of rice–fish systems. Recognizing the need for innovative ways to manage human-dominated landscapes and climate-sensitive ecosystems such as floodplains, we have analysed seasonal aquaculture interventions along with local adaptation of water management strategies, including the consideration of groundwater mechanisms. The results, supported by quantitative analysis and qualitative arguments, demonstrate the significant contribution of seasonal aquaculture in improving the rice–fish production systems of the selected floodplain sites. This was achieved through the increased productivity of water and fish and the reduction of the risk posed by arsenic contamination. The study is also illustrative of the diversification in livelihood-generating activities to cope with the extended period of flooding cycle in the region. We highlight the value of multiple resource-use approaches to enhance the social and ecological resilience of floodplains, and the need to re-consider basin water management options to recognize the water requirements of other sources of food such as fish produced by capture fisheries and aquaculture. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.664551 [article] Multiple water use as an approach for increased basin productivity and improved adaptation : A case study from Bangladesh [texte imprimé] / Nidhi Nagabhatla, Auteur ; Malcolm Beveridge, Auteur ; A. B.M. Mahfuzul Haque, Auteur . - 2012 . - pp. 121-136. Hydraulique Langues : Anglais (eng) in JRBM : International journal of river basin management > Vol. 10 N° 1 (Janvier 2012) . - pp. 121-136 Mots-clés : Seasonal  floodplain  Basin  Water  management  Bangladesh  Multiple  water  use  Adaptation Résumé : This study, supported by the Challenge Program Water and Food (CPWF-Project 35), demonstrates the case of multiple-use of water through seasonal aquaculture interventions for improved rice–fish production systems in the Bangladesh floodplains. The project focused on community-based fish culture initiatives, increasingly adopted in the agro-ecological zones of the major floodplains of the Padma, Testa, and Brahmaputra basin. The productivity of water and fish is used as an indicator to explain this case. We hypothesize that seasonal aquaculture supported by the management of floodplains for multiple-use of water can significantly increase the productivity of rice–fish systems. Recognizing the need for innovative ways to manage human-dominated landscapes and climate-sensitive ecosystems such as floodplains, we have analysed seasonal aquaculture interventions along with local adaptation of water management strategies, including the consideration of groundwater mechanisms. The results, supported by quantitative analysis and qualitative arguments, demonstrate the significant contribution of seasonal aquaculture in improving the rice–fish production systems of the selected floodplain sites. This was achieved through the increased productivity of water and fish and the reduction of the risk posed by arsenic contamination. The study is also illustrative of the diversification in livelihood-generating activities to cope with the extended period of flooding cycle in the region. We highlight the value of multiple resource-use approaches to enhance the social and ecological resilience of floodplains, and the need to re-consider basin water management options to recognize the water requirements of other sources of food such as fish produced by capture fisheries and aquaculture. ISSN : 1571-5124 En ligne : http://www.tandfonline.com/doi/full/10.1080/15715124.2012.664551

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