Monitoring soil erosion in the Souss basin, Morocco, with a multiscale object-based remote sensing approach using UAV and satellite data
Klaus Daniel Peter
Johannes B. Ries
Ali Aït Hssaïne
- This article presents a multiscale approach for detecting and monitoring soil erosion phenomena (i.e. gully erosion) in the agro-industrial area around the city of Taroudannt, Souss basin, Morocco. The study area is characterized as semi-arid with an annual average precipitation of 200 mm. Water scarcity, high population dynamics and changing land use towards huge areas of irrigation farming present numerous threats to sustainability. The agro-industry produces citrus fruits and vegetables in monocropping, mainly for the European market. Badland areas strongly affected by gully erosion border the agricultural areas as well as residential areas. To counteract the significant loss of land, land-leveling measures are attempted to create space for plantations and greenhouses. In order to develop sustainable approaches to limit gully growth the detection and monitoring of gully systems is fundamental. Specific gully sites are monitored with unmanned aerial vehicle (UAV) taking small-format aerial photographs (SFAP). This enables extremely high-resolution analysis (SFAP resolution: 2-10 cm) of the actual size of the gully channels as well as a detailed continued surveillance of their growth. Transferring the methodology on a larger scale using Quickbird satellite data (resolution: 60 cm) leads to the possibility of a large-scale analysis of the whole area around the city of Taroudannt (Area extent: ca. 350 km²). The results will then reveal possible relationships of gully growth and agro-industrial management and may even illustrate further interdependencies. The main objective is the identification of areas with high gully-erosion risk due to non-sustainable land use and the development of mitigation strategies for the study area.
Reformbedarf im Recht der Vormundschaft/Pflegschaft
A modification of the mixed form of Richards equation and its application in vertically inhomogeneous soils
- Recently, new soil data maps were developed, which include vertical soil properties like soil type. Implementing those into a multilayer Soil-Vegetation-Atmosphere-Transfer (SVAT) scheme, discontinuities in the water content occur at the interface between dissimilar soils. Therefore, care must be taken in solving the Richards equation for calculating vertical soil water fluxes. We solve a modified form of the mixed (soil water and soil matric potential based) Richards equation by subtracting the equilibrium state of soil matrix potential ψE from the hydraulic potential ψh. The sensitivity of the modified equation is tested under idealized conditions. The paper will show that the modified equation can handle with discontinuities in soil water content at the interface of layered soils.
Die Textrückmeldung in der Schreibberatung für internationale Studierende
Jahrestagung der Gesellschaft für Medizinische Ausbildung ; Medizinische Fakultät der Ludwig-Maximilians-Universität München ; 05.-08. Oktober 2011 ; Tagungsband ; [Lehren - Lernen - Prüfen ; von der Dissonanz zum Dreiklang? ; abstracts] ; Lehren - Lernen - Prüfen
- Book of Abstracts: Jahrestagung der Gesellschaft für Medizinische Ausbildung (GMA): 05.10. - 08.10.2011, München
Ordnungen des Sehens / Systems of Perception
Effective theory for QCD at finite temperature and density from strong coupling expansion
- QCD at finite temperature and denisty remains intractable by Monte Carlo simulations for quark
chemical potentials m >∼T. It has been a long standing problem to derive effective theories from
QCD which describe the phase structure of the former with controlled errors. We propose a
solution to this problem by a combination of analytical and numerical methods. Starting from
lattice QCD with in Wilson’s formulation, we derive an effective action in terms of Polyakov
loops by means of combined strong coupling and hopping expansions. The theory correctly
reflects the centre-symmetry in the pure gauge limit and its breaking through quarks. It is valid
for heavy quarks and lattices up to Nt ∼ 6. Its sign problem can be solved and we are able to
calculate the deconfinement transition of QCD with heavy quarks for all chemical potentials.
Strong coupling effective theory with heavy fermions
- We extend the recently developed strong coupling, dimensionally reduced Polyakov-loop effective
theory from finite-temperature pure Yang-Mills to include heavy fermions and nonzero chemical
potential by means of a hopping parameter expansion. Numerical simulation is employed to
investigate the weakening of the deconfinement transition as a function of the quark mass. The
tractability of the sign problem in this model is exploited to locate the critical surface in the
(M/T,m/T,T) space over the whole range of chemical potentials from zero up to infinity.
Measurements of proton-induced reactions on ruthenium-96 in the ESR at GSI
Tudi Le Bleis
Yury A. Litvinov
Danyal F. A. Winters
Philip J. Woods
- 8th International Conference on Nuclear Physics at Storage Rings-Stori11, October 9-14, 2011
Laboratori Nazionale di Frascati, Italy.
Storage rings offer the possibility of measuring proton- and alpha-induced reactions in inverse
kinematics. The combination of this approachwith a radioactive beamfacility allows, in principle,
the determination of the respective cross sections for radioactive isotopes. Such data are highly
desired for a better understanding of astrophysical nucleosynthesis processes like the p-process.
A pioneering experiment has been performed at the Experimental Storage Ring (ESR) at GSI
using a stable 96Ru beam at 9-11 AMeV and a hydrogen target. Monte-Carlo simulations of
the experiment were made using the Geant4 code. In these simulations, the experimental setup is
described in detail and all reaction channels can be investigated. Based on the Geant4 simulations,
a prediction of the shape of different spectral components can be performed. A comparison
of simulated predictions with the experimental results shows a good agreement and allows the
extraction of the cross section.
LatticeQCD using OpenCL
- We report on our implementation of LatticeQCD applications using OpenCL. We focus on the
general concept and on distributing different parts on hybrid systems, consisting of both CPUs
(Central Processing Units) and GPUs (Graphic Processing Units).