GT 5 / WG 5 Hydrology

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Michel Marier
il y a 8 ans
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1 GT 5 / WG 5 Hydrology ORFEO First Methodology and Thematic teams meeting CNES, March 2006 A.-Véronique Auzet, CNRS, IMFS auzet@imfs.u-strasbg.fr

2 WG 5 members External Anne-Véronique Auzet, CNRS (IMFS) Patrick Lachassagne, BRGM (service Eau) Catherine Freissinet, SOGREAH Catherine Ottle, CNRS (CETP) Thierry Percie du Sert, ARPE (Midi-Pyrénées) Christian Puech, CEMAGREF Philippe Vervier, CNRS (ECOBAG) CNES: Hervé Jeanjean, responsable thématique Hydrologie Eliane Cubero-Castan, animatrice GT Hydrologie

du Sert, ARPE (Midi-Pyrénées) Christian Puech, CEMAGREF Philippe Vervier, CNRS (ECOBAG)

3 Domain of interest Hydrological processes Water cycle and budget Fluvial systems: catchments, hillslopes and river courses, floodplains including wetlands and riverbeds Surface and groundwater: resources management Floods and related risks: modelling and monitoring Local and regional scales

wetlands and riverbeds Surface and groundwater: resources management

4 Interests and interactions with other WGs Agriculture Crop managt, Spatial variability, Irrigation, Agro-Environt measures, Landscape f. Hazards &Risks Floods Dryness Coasts & Sea Land Use Hydrodynamics Hydrology Soil surface characteristics Land use Landscape features DTM, river beds, connectivity Sealing, building Mapping & Land managt Land use & cover, DTM Waterbodies & aquifers Waterquality Geology & Geophysics Geomorphology: Massmovements Soil erosion Forest Type & Cover Hedge & grove Tracks Dynamics

Hazards &Risks Floods Dryness Coasts & Sea Land Use Hydrodynamics Hydrology Soil surface characteristics Land use Landscape

5 Common requirements Topography (detailed, identification of specific features flow paths and direction) Land use and land cover (spatial variability, dynamics) Soil properties Agricultural practices (e.g. tillage/no tillage/minimum tillage) Water cycle and water budget,

(spatial variability, dynamics) Soil properties Agricultural

6 More specific requirements soil surface characteristics (hydrodynamics, thresholds in processes) morphology of hydrological network (flow pathways, gullies, river beds; hydraulic parameters) geomorphology of river beds «natural» and «peri-urban» areas active and contributing areas (to main processes of flow generation and discharge, sediment and pollutants delivery )? pressure on water resources? flood prevention, control, managment?

beds «natural» and «peri-urban» areas active and contributing areas (to main processes of flow generation and

7 WG5 requirements towards ORFEO Objects Saturated areas River network River beds, river banks Blockages Furrows, connectivities Flooded areas Watertable depth Fields (crop cover, surface roughness, soil wc ) Urban & periurban areas Functions Soil water content Variability of soil properties Surface roughness Soil surface dynamics Flow directions Piezometry dynamics Bathymetry Agricultural practices Indices of crop cover development

Urban & periurban areas Functions Soil water content Variability of soil properties Surface roughness Soil

8 Products - Soil surface characteristics (roughness, structure) - Characterization and monitoring of pools and water bodies - Identification of detailed features (furrows, deaches, dams ) - Detailed morphology: hydrographic network, waterpathways on hillslopes - Aquifers (hydrodynamic parameters, piezometry, pumping) - Interface surface water / groundwater and groundwater rising - Housing, land resource and land use, vulnerability - Meteorological data - Water quality (turbidity, eutrophication, pollutant plume)

hillslopes - Aquifers (hydrodynamic parameters, piezometry, pumping) - Interface surface water / groundwater and groundwater

9 Fonctionnalités géométriques - Superposition d images (Visible / Visible, Visible / Radar, Radar / radar) - Superposition image / carte et image / BD - Localisation, ortho rectification et projection dans système de référence local - MNT / MNE Pentes - Navigation 3D

carte et image / BD - Localisation, ortho rectification et

10 Fonctionnalités radiométriques - Reconnaissance d objets - Détection des changements entre images - Détection des changements pour quelques «objets» identifiés et reconnus - Reconnaissance de classes de couverture des sols - Outils multi résolution Synthèse d images Calcul d indices à partir de modèles

identifiés et reconnus - Reconnaissance de classes de couverture des sols -

11 réalisation fonctionnalités particulières - Superposition, Localisation, ortho rectification, MNT, Pentes - Reconnaissance d objets (bâti, parcelles agricoles, cultures permanentes, arbres, réseaux etc.) - Détection des changements entre images - Reconnaissance de types d états de surface du sol - Reconnaissance de classes de couverture des sols - Outils multi résolution par synthèse d images par calcul d indices à partir de modèles

) - Détection des changements entre images - Reconnaissance de types d états de surface du sol -

12 Thematic studies 1. Flow paths, multi scale analysis of the river network system 2. River hydrology, river bed morphology and ecological habitats 3. Socio-economic parameters extraction from typologies of human-made objects (houses, artificially surfaced areas, power, water and sewerage networks, transport) 4. Soil surface characteristics (roughness, structure, water content)

Socio-economic parameters extraction from typologies of human-made objects (houses,

13 1. Flow paths, multi scale analysis of the river network system To identify and characterize the «potential» network of flow paths (<10m) from spatial imagery and DTM («50m), including small gullies To identify the network from slopes and flow directions, without elevation data? Sites: Cévennes, Draix, Orgeval Interest for flood prevention

DTM («50m), including small gullies To identify the network from slopes and flow

14 2. River hydrology, river bed morphology and ecological habitats Caractériser les plans d eau et le lit divaguant de rivières méditerranéennes À terme, approche du débit par imagerie (profondeur, niveau et vitesses Site: Durance

divaguant de rivières méditerranéennes À terme, approche

15 3. Socio-economic parameters extraction from typologies of human-made objects Maquaire et al., 2004

16 a) Building characteristics : b) Interstitial area characteristics :

18 4. Soil surface characteristics 60 Capacité d infiltration (mm/h) état fragmentaire avec croûte structurale EDS dégradé Précipitations cumulées (mm) Source: RIDES/PNRH, 2005

fragmentaire avec croûte structurale EDS dégradé 0

20 Soil surface roughness Backscattering coefficient [db] RADARSAT 47 sigma_0 [db] = exp (-k rms) ; R² = 0.76 s i g m a _ 0 ( d B ) relation s moy sigma_0 / sol nu (24 mars) 0 0,5 1 1,5 2 2,5 3 3,5 4 4, rms mean [cm] s moy (cm) Baghdadi et al., 2005; RIDES 2005

76 s i g m a _ 0 ( d B ) 0-4 -6-8 -10 relation s moy sigma_0 / sol nu (24 mars)

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