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Monitoring soil erosion in the Souss basin, Morocco, with a multiscale object-based remote sensing approach using UAV and satellite data (2011)

Sebastian D'Oleire-Oltmanns Irene Marzolff 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.

A modification of the mixed form of Richards equation and its application in vertically inhomogeneous soils (2011)

Frank Kalinka Bodo Ahrens

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.

International Lateinamerika-Kolloquium 2009 : abstracts and program ; Geowissenschaftliches Zentrum der Universität Göttingen, April 7 - 9, 2009 / Gerhard Wörner ; Stefan Möller-McNett (ed.) (2009)

Provenance of Ordovician and Devonian sandstones from southern Peru and northern Bolivia - U-Pb and Lu-Hf isotope evidence of detrital zircons and its implications for the geodynamic evolution of the Western Gondwana margin (14°-17°S) (2009)

Cornelia R. Reimann Heinrich Bahlburg Ellen Kooijman Jasper Berndt Axel Gerdes Victor Carlotto

U-Pb LA-ICP-MS age determinations of growth impulses in zircons from Carboniferous post-orogenic granites, Sierra de Velasco (NW-Argentina) (2009)

Frank Söllner Pablo Grosse Axel Gerdes Alejandro J. Toselli Juana Norma Rossi

Water Resources in the Future Climate Change Scenario: Development of an Integrated Management Concept for Water Supply in the Federal District of Brasília – DF (Central Brazil) (2009)

Arne P. Willner Hans-Joachim Massonne Axel Gerdes Francisco Hervé Masafumi Sudo Stuart N. Thomson

Magnetische Suszeptibilitätsmessungen an Gängen vom Ostrand des Hauzenberger Granitplutons - Bayerischer Wald (2006)

Verena Streit Helga de Wall Carlo Dietl

Geobiologie : Kurzfassungen der Vorträge und Poster ; Göttingen, 02. bis 08. Oktober 2004 = Geobiology / Joachim Reitner ... (Hrsg.) (2004)

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