Untersuchungen zur hydrologischen Topologie von Landschaftsobjekten für die distributive Flussgebietsmodellierung

Entwicklung einer Methodik zur hydrologischen distributiven Flusseinzugsgebietsmodellierung, die die Vorteile des Ansatzes der Hydrological Resonse Units (HRUs) mit topologischer Information für die Modellierung der lateralen und Gerinneabflussmodifikation versieht. Entwicklung des Distributionskonzepts der topologischen HRUS. Entwicklung einer GIS-Anwendung zur Ausweisung der Modelleinheiten und ihrer Topologie. Erstellung eines distributiven Flussgebietsmodells, das dieses Konzept mit dem PRMS-Modell zur Abflussbildung und konzeptionellen Ansätzen zur lateralen Flächen und Gerinnedynamik implementiert. Evaluierung der Methodik durch Anwendung in zwei ausgewählten Einzugsgebieten (Bröl/Nordrhein-Westfalen, Ilm/Thüringen)

The development of an innovative computer-based Integrated Water Resources Management System for water resources analyses

International audienceThe European IWRMS (Integrated Water Resources Management System) project is dedicated to developing a toolset for a sustainable use and distribution of water resources in souther African countries. This system integrates various scientific components: remote sensing, information systems, database management, and hydrological modelling. This paper is mainly related to the remote sensing contribution of the project. Two points are discussed: land cover classification and the spatio-temporal processing of remote sensing data to extract hydrological parameters

Assessing the Effect of Disturbances on Ectomycorrhiza Diversity

Ectomycorrhiza (ECM) communities can be described on a species level or on a larger scale at an ecosystem level. Here we show that the species level approach of successional processes in ECM communities is not appropriate for understanding the diversity patterns of ECM communities at contaminated sites. An ecosystem based approach improves predictability since different biotic and abiotic factors are included. However, it still does not take into account the hierarchical structure of the ecosystem. We suggest that diversity patterns of ECMs communities in forests can best be investigated at three levels. This hypothetical approach for investigation can be tested at sites of secondary succession in areas contaminated with metals. Once the diversity patterns are appropriately described by a hierarchical ecosystem approach, to the species level is used to explain these patterns by populational and ecotoxicological mechanisms

Land use classification at meso-scale using remotely sensed data

International audienceIn this paper we present a framework to generate a land cover classification from coarse spatial resolution remotely sensed data acquired by NOAA-AVHRR sensor. We define a model for the pixels’ content and a process allowing to compute the individual proportions of the different land cover types for each pixel. The method is based on a linear mixture model of reflectances and exploits the good temporal frequency of NOAA acquisitions. The result provides a description in terms of land covers percentage within each NOAA pixel. A quality evaluation is performed on a test area for which high spatial resolution and temporal NOAA data are simultaneously available

Application of Remote Sensing to the Development of an Integrated Water Resources Management System (IWRMS)

International audienceWater resources management in Southern Africa is a complex challenge which requires an appropriate integrated approach if strategic and prognostic planning should be based on sound scientific findings in order to optimize and conserve the precious land and water resources. The prototype Integrated Water Resources Management System (IWRMS) will be a toolset of validated computer based procedures, where remote sensing is the major methodology to provide areal data sources to hydrological models assisting water resources managers through their decision strategies

Integrated Water Resources Management System: a decision support system based on remote sensing data evaluation

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The development of an innovative computer based "Integrated water resources management system" for semi-arid catchments : concept and firts results

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