Didier Orange

Didier Orange
Institute of Research for Development | IRD · 210 - Functional Ecology and Biochemistry of Soils and Agroecosystems (Eco&Sols)

PhD, HDR
Agroecology and water economy via NBS and Living Lab

About

230
Publications
52,260
Reads
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3,291
Citations
Citations since 2016
43 Research Items
1766 Citations
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2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
Introduction
Ecohydrologist working on ecological engineering to promote Nature-Based Solutions related to productive water in rural and urban situations, mainly in tropical zone. My research focuses on inclusive natural resources management, about 1) greening applications to human well-being (food production, clean water, healthy soils, C sequestration) and 2) multidisciplinary approaches as an innovative asset to tackle societal challenges such as water scarcity, biodiversity decrease and climate change.
Additional affiliations
January 2002 - January 2015
Institute of Research for Development
Position
  • Senior Researcher
September 2000 - December 2001
Sorbonne Université
Position
  • Senior Researcher
Education
October 1987 - December 1990
University of Strasbourg (Centre de Géochimie de la Surface)
Field of study
  • Geochemistry, Hydrology, Sediment River Transport
September 1986 - June 1987
Université d'Orléans
Field of study
  • Hydrology, Hydrogeology, Soil science
September 1983 - August 1986
Ecole Supérieure Energie et Matériaux (ESEM)
Field of study
  • Geology, Soil mechanics, Hydrology, Civil Engineering

Publications

Publications (230)
Preprint
Sustainable water management in semi-arid agriculture practices requires quantitative knowledge of water fluxes within the soil-vegetation-atmosphere system. Therefore, we used stable-isotope approaches to evaluate evaporation (E), transpiration (T), and groundwater recharge (R) at sites in Senegal’s Groundnut basin and Ferlo Valley pasture region...
Article
Full-text available
Theoretical and functional ecology is a source of useful knowledge for ecological engineering. The better understanding of the natural service of water quality regulation is now inspiring for optimization of water resource management, restoration and bioremediation practices. This transfer with a biomimicry approach applies particularly well in the...
Preprint
Knowledge of the water fluxes within the soil-vegetation-atmosphere system is crucial to perform and evaluate sustainable water management practices in semi-arid regions. To implement reliable approaches for estimating water fluxes, the quantification of evaporation (E ), transpiration (T ) and groundwater recharge (R) are essential. In this presen...
Article
Full-text available
Inside sand filters, as inside other microporous substrates, several invertebrates create temporary burrows that impact on water movement through the filter. Lumbricids Eisenia fetida and Eisenia andrei live under a wide range of environmental conditions and have a high reproduction rate so they are good candidates for ecological engineering tests....
Chapter
Full-text available
La réduction pluviométrique des années 1970, moins marquée en Afrique centrale qu'en Afrique de l'Ouest, a tout de même largement impacté les régimes hydrologiques des grands cours d'eau de la région. L’étude du comportement hydropluviométrique de la rivière Oubangui à Mobaye a pour avantage d'étudier un bassin hors impact anthropique. Le couvert f...
Chapter
Full-text available
The rainfall reduction in the 1970s, less marked in Central Africa than in West Africa, still had a major impact on the hydrological regimes of the region's large rivers. The study of the hydropluviometric behavior of the Ubangi River at Mobaye has the advantage of being a study of a basin excluding anthropogenic impact. Forest cover and population...
Book
Full-text available
CID’2021. Adaptation et résilience des agricultures en Afrique de l’Ouest : innovations agroécologiques et intégration des territoires. Ed. Sc : Kane N (ISRA), Orange D (IRD), Brun-Diallo L (DyTAES), 3e Conférence Intensification Durable, 24-26 Novembre 2021, Dakar. Ed. ISRA-IRD-CIRAD-DyTAES. 172 p.
Article
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The FRIEND-Water program (FWP) is the oldest and the most transverse program (i.e. Flagship Initiative) within the Hydrological Intergovernmental Program (IHP) from UNESCO. FRIEND means “Flow Regimes from International and Experimental Network Data”. The FWP is dedicated to allow large communities of hydrologists and associated disciplines to colla...
Article
Full-text available
Due to global change, cities of the future will have to deal with more intense runoff and longer drought sequences, in addition to a growing urban and peri-urban population. French Mediterranean cities, such as Toulon, are already densely urbanised and exposed to the effects of global warming. The adaptation of their infrastructures is problematic....
Article
Abstract : Abstract Here, we simulate carbon dioxide (CO2) sequestration in 300 major world river basins (about 70% of global surface area) through carbonates dissolution and silicate hydrolysis. For each river basin, the daily timescale impacts under both the RCP 2.6 and RCP 8.5 climate scenarios were assessed relative to a historic baseline (1969...
Presentation
Full-text available
Wetlands are known for their natural service of water quality regulation. The hyporheic zones of the rivers filter and purify the surface water from the stream and infiltrated waters in soil nearby through the riparian zone. This purification service occurs because of a synergy between the substrate and its biodiversity (including plants, bacteria...
Article
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A large share of surface water resources in Sahelian countries originates from Guinea's Fouta Djallon highlands, earning the area the name of "the water tower of West Africa". This paper aims to investigate the recent dynamics of the Fouta Djallon's hydrological functioning. The evolution of the runoff and depletion coefficients are analyzed as wel...
Article
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Although the Congo Basin is still one of the least studied river basins in the world, this paper attempts to provide a multidisciplinary but non-exhaustive synthesis on the general hydrology of the Congo River by highlighting some points of interest and some particular results obtained over a century of surveys and scientific studies. The Congo Riv...
Article
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The research of ruptures on rainfall and discharge serial data from 1950 to 1995 of three small catchments (from 2000 to 6000 km2) of the Central African Republic, at the boundary between Chad and Congo basins, has shown a high spatial variability. The rupture observed in 1970 at the subcontinental scale, which started the drought period in West an...
Article
Full-text available
Local peoples from Niakhar in the Senegalese peanut basin highlight a dramatic increase of water access problems due to marked rainfall deficits and salinization of surface and ground water resources. The chemical quality of groundwaters is often critical because of the salinization process, whereas water surfaces, which should be used in such situ...
Article
Full-text available
The Red River is a typical example of the Southeast Asian rivers, which has been strongly affected by human activities. This paper analyses the change of total suspended sediment (TSS) load of the Red River from 1960 to 2015 in which numerous new dams in both China and Vietnam have been constructed. A strong decrease of TSS load of the whole Red Ri...
Article
Full-text available
For three decades, the solid and dissolved fluxes of the Congo River have been regularly monitored on a monthly basis, despite 12 years of deficiencies (1994–2005). Two programs successively carried out these follow-ups: PEGI/GBF (1987–1993) and SO HYBAM (2006–2017), upstream and downstream, respectively, of the Malebo Pool near Brazzaville, the ma...
Article
Full-text available
The Paris Climate Agreements and Sustainable Development Goals, signed by 197 countries, present agendas and address key issues for implementing multi-scale responses for sustainable development under climate change—an effort that must involve local, regional, national, and supra-national stakeholders. In that regard, Continental Carbon Sequestrati...
Experiment Findings
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Experiment Findings
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Conference Paper
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The Niakhar area, located in the Sine-Saloum watershed, belongs to the administrative region of Fatick in the agricultural region of Senegalese peanut basin under the soudano-sahelian climate. Nowadays, local people highlight a dramatic increase of water access problems due to marked rainfall deficits and overexploitation of surface and ground wate...
Article
Full-text available
The Red River basin is a typical Asian river system affected by climate and anthropogenic changes. The purpose of this study is to build a tool to separate the effect of climate variability and anthropogenic influences on hydrology and suspended sediments. A modeling method combining in situ and climatic satellite data was used to analyze the disch...
Technical Report
Full-text available
Discharge of the Oubangui
Article
Full-text available
Ce papier revisite l'évolution hydroclimatique de l'Oubangui à Bangui à la faveur d'une nouvelle série hydropluviométrique de 1935 à 2015. Pour cela, les données annuelles pluviométriques et hydrologiques de l'Oubangui à Bangui ont été analysées avec différents tests statistiques (indices pluviométrique et d'écoulement, recherches de ruptures, coef...
Research
Full-text available
Smart Clean Garden Concept description for the International forum of CONVERGENCES, Paris , Septembre 2018. Lauréat international Recherche des Prix CONVERGENCES 2018
Article
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Planktons are a major component of food web structure in aquatic ecosystems. Their distribution and community structure are driven by the combination and interactions between physical, chemical, and biological factors within the environment. In the present study, water quality and the community structure of phytoplankton and zooplankton were monthl...
Book
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Le récent développement du concept de Services Ecosystémiques a largement contribué à améliorer notre compréhension du rôle de l’environnement naturel dans le développement des sociétés humaines. La notion de gestion intégrée des ressources naturelles (IWRM) s’est imposée et a été dépassée par le nexus Eau-Energie-Sol-Nourriture (WELF). Aussi au-de...
Article
Full-text available
Research on hydropower development has shown that a diversity of social and environmental impacts of dams is distributed unevenly among various state and corporate actors and riparian populations. This article analyses how two neighbouring socialist states, China and Vietnam, govern dam-induced resettlement along their respective sections of the Re...
Article
The development of efficient bioremediation techniques to reduce aquatic pollutant load in natural sediment is one of the current challenges in ecological engineering. A nature-based solution for metal bioremediation is proposed through a combination of bioturbation and phytoremediation processes in experimental indoor microcosms. The invertebrates...
Article
Full-text available
Dans le bassin arachidier (en zone soudano-sahélienne) et particulièrement dans le bassin de Thysse Kaymore, le déficit pluviométrique continu et prononcé depuis les années 1970 et la pression démographique croissant ont conduit à la dégradation des ressources en eau, rendant de plus en plus difficile l’accès à l’eau. Les eaux souterraines sont sou...
Article
Full-text available
Organic fertilizer application is often touted as an economical and effective method to increase soil fertility. However, this amendment may increase dissolved organic carbon (DOC) runoff into downstream aquatic ecosystems and may consequently alter aquatic microbial community. We focused on understanding the effects of DOC runoff from soils amende...
Article
Full-text available
The humid tropics are exposed to an unprecedented modernisation of agriculture involving rapid and mixed land-use changes with contrasted environmental impacts. Afforestation is often mentioned as an unambiguous solution for restoring ecosystem services and enhancing biodiversity. One consequence of afforestation is the alteration of streamflow var...
Article
Full-text available
Because of climatic change, local communities in Africa have to resolve problems of accessibility to water resources in decreasing. That problem is linked with population growth and resources pollution. Of course it is to add undesirable climatic side effects such as: floods, soil erosion, wildfires⋯ African countries have to prepare their urban an...
Article
Full-text available
La vulnérabilité et l'adaptabilité des communautés locales aux problèmes d'eau en Afrique (humide, sèche, semi-aride, etc.) sont des questions d'actualité et un défi commun. Ceci implique d'évaluer les changements enregistrés par les systèmes aquatiques sous forme d'excès et de pénurie aussi bien en milieu rural (récession pluviométrique, assècheme...
Article
Full-text available
The humid tropics are exposed to an unprecedented modernization of agriculture involving rapid and highly-mixed land-use changes with contrasted environmental impacts. Afforestation is often mentioned as an unambiguous solution for restoring ecosystem services and enhancing biodiversity. One consequence of afforestation is the alteration of streamf...
Research
Full-text available
Accroître la capacité d'utilisation de l'information environnementale par les acteurs du développement (micro-projets affiliés), en les soutenant et en les guidant dans cette utilisation. Faire naître ainsi une demande d'information plus consistante et plus exigeante, à laquelle l'observatoire devra répondre par une offre de plus en plus élaborée e...
Research
Full-text available
La Zone Atelier ZADIN (1998-2000) avait un double objectif : (1) fournir aux sociétés d'usagers du DIN le maximum d'information fondés sur des bases scientifiques pour la GRN; (2) participer à l'élaboration d'outils d'aide à la GRN.
Article
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The impact of organic matter inputs from agricultural, forest and domestic sources on aquatic processes has been considerably less studied in tropical reservoirs relative to temperate systems despite the high number of these small aquatic systems in the tropics. Here we present the results of an in situ mesocosm study that examined the impact of al...
Article
Full-text available
For almost two decades, the French Institut de Recherche pour le Développement (IRD) has been working in partnership with the Soils and Fertilizer Research Institute (SFRI) to study soil erosion and land use change in the small catchment of Dong Cao, Tien Xuan, North Vietnam. This partnership forms one of the main pillars of the regional Multi - Sc...
Conference Paper
Full-text available
Abstract: For almost two decades, the French Institut de Recherche pour le Développement (IRD) has been working in partnership with the Soils and Fertilizer Research Institute (SFRI) to study soil erosion and land use change in the small catchment of Dong Cao, Tien Xuan, North Vietnam. This partnership forms one of the main pillars of the regional...
Conference Paper
Full-text available
Abstract: For almost two decades, the French Institut de Recherche pour le Développement (IRD) has been working in partnership with the Soils and Fertilizer Research Institute (SFRI) to study soil erosion and land use change in the small catchment of Dong Cao, Tien Xuan, North Vietnam. This partnership forms one of the main pillars of the regional...
Conference Paper
Full-text available
The Red River Delta (RRD) in northern Vietnam represents a complex hydrological network of tributaries and distributaries receiving large and seasonally fluctuating water flows from the upper Red River basin. The 14 300 km2 of the Red River Delta are subject to tidal influence due to the very flat relief. This study deals with the Day-Nhue River sy...
Article
Full-text available
While soil erosion is reasonably well documented at the plot scale, data remain scarce at the catchment scale and predominantly stem from short-term studies. In this context, the “Management of Soil Erosion Consortium” network, which recently became the Multi-Scale Environmental Changes observatory (MSEC3, http://www.msec3.net/portal/), was establi...
Conference Paper
Full-text available
Besides the inputs of material from land-based sources and the in-stream processes leading to transformation, retention and elimination of nutrients during their downstream travel, the nutrient flux transported by river systems depends on a number of factors, including the influence of hydrological fluctuations due to tidal movement. We monitored t...
Article
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Developing models to predict on-site soil erosion and off-site sediment transport at the agricultural watershed scale represent an on-going challenge in research today. This study attempts to simulate the daily discharge and sediment loss using a distributed model that combines surface and sub-surface runoffs in a small hilly watershed (< 1 km 2)....
Conference Paper
Full-text available
Topic: 02. Hydropower development and impacts on economy
Book
Full-text available
Water budget, nitrogen and phosphorous are major variables to control the productive function of aquatic ecosystems, mainly in delta ecosystems. Besides the inputs of material from land-based sources and the in-stream processes leading to transformation, retention and elimination of nutrients during their downstream travel through the river continu...
Article
Full-text available
The low resolution NOAA/AVHRR14 data is used to characterize the space-time propagation of the flood and of the vegetation cover in the Inner Delta of the Niger River in Mali. We propose a method to identify the inundation front on satellite images, and to discriminate pixels of open water, flooded vegetation, vegetation on dry soil and bare soil....
Article
Full-text available
The River Niger Inner Delta is a wide natural seasonal flood plain in Mali, where the two main streams of the River Niger gather. This area is only poorly influenced by hydraulic managements, thus the inundation dynamic is mostly natural. Many people live in this humid area, and their activities depend on the date of arrival of the flood peak, and...
Article
Full-text available
The Oubangui River drains around 490,000 km2 to its outlet at Bangui. Its hydrological rate of flow recorded since 1911 is marked mainly by a persistent regression of flows (29% of decline compared with 1935-2006s average) corresponding to 13% of rainfall decline due to 1971s climatic break. Since then, only two floods occurred at Bangui on 1975 an...
Conference Paper
Full-text available
Soil erosion in highly incised catchments of northern Vietnam harms both upstream and downstream communities (Valentin et al. 2008). Sediment discharged from these catchments reflects a loss of fertile topsoil that farmers depend on for the production of crops and pastures. In addition, increased sediment loads in streams and rivers reduce water qu...
Article
Earthworms and termites, as soil engineers, play a major role in the regulation of biogeochemical processes and the provision of ecosystem services. They create biogenic aggregates on the soil surface, e.g., earthworm casts and termite sheetings, which can influence soil erosion and the downward transfer of fertility. We assessed the effect of the...
Article
Full-text available
In Vietnam soil erosion is a major environmental problem with respect to soil fertility, water quality and downstream property damages and involves 40% of total land surface. Due to a continuous and persistent decrease of soil quality under annual crops, farmers gradually convert their fields to grazing lands and their crops to fodder cultures or t...