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Accueil du site → Doctorat → Pays-Bas → 2002 → Addressing the multi-scale lapsus of landscape : multi-scale landscape process modelling to support sustainable land use : a case study for the Lower Guadalhorce valley South Spain

Wageningen Universiteit (2002)

Addressing the multi-scale lapsus of landscape : multi-scale landscape process modelling to support sustainable land use : a case study for the Lower Guadalhorce valley South Spain

Schoorl, J.M.

Titre : Addressing the multi-scale lapsus of landscape : multi-scale landscape process modelling to support sustainable land use : a case study for the Lower Guadalhorce valley South Spain

Auteur : Schoorl, J.M. 

Université de soutenance : Wageningen Universiteit

Grade : PhD thesis 2002

Résumé partiel
"Addressing the Multi-scale Lapsus of Landscape" with the sub-title "Multi-scale landscape process modelling to support sustainable land use : A case study for the Lower Guadalhorce valley South Spain" focuses on the role of landscape as the main driving factor behind many geo-environmental processes at different temporal and spatial levels. LAPSUS is the name of the geomorphological model developed in this study and at the same time it is taken, with a certain degree of freedom, as a reference to the underestimated importance of landscape as cause and result of geomorphological processes.

The main objective of this research is to investigate the role of the landscape at different spatial and temporal levels (extension and resolution) in geomorphological processes (e.g. soil redistribution : erosion and sedimentation), focussing on the sustainability of land use within a representative Mediterranean landscape. Landscape is defined in terms of genesis, geomorphology, lithology/ soil, land cover, land use, and even land management (human factor).

The research area chosen for this study is located in the south of Spain, surrounding the village of Álora, in the central Guadalhorce river basin in the province of Málaga, Andalucía (Chapter 1). The area has a mean annual temperature of 17.5 °C and receives a mean yearly rainfall of 534 [mm], distributed mainly from October to April. This research area was selected as representative for a wide variety of Mediterranean environmental conditions in terms of a complex geological history resulting in a spatial diversification over short distances of morphology, lithology and active landscape processes ranging from tectonics, land use changes to land degradation.

The study is directed, from the beginning to the end, at different spatial and temporal extensions-resolutions, studying different landscape processes within their specific spatial and temporal boundaries (Chapter 1). The first step in this investigation is the understanding of the evolution of the landscape and the geological background of the research area (spatial extension 10 2[km 2], temporal extension 10 7[a], temporal resolution 10 4to 10 5[a], Chapter 2). The second step is the development of a multi-scale landscape process model LAPSUS, valid at different spatial and temporal resolutions (spatial extension 10 3to 10 5[m 2], spatial resolution from 1 to 81 [m], Chapter 3). The third step comprises the actual measurement of net soil redistribution rates at the landscape level using the 137Cs technique. First, the applicability of this technique under the current Mediterranean conditions of the research area is evaluated (spatial extension 10 3to 10 5[m 2] Chapter 4). Secondly, net 137Cs derived soil redistribution rates on the temporal resolution of years and decades is simulated and the monitored erosion and sedimentation patterns are compared with the possibilities of the LAPSUS model (spatial resolution 7.5 [m], Chapter 5). The fourth step is the evaluation of the soil-landscape context at the multi-catchment or basin scale with special attention to the effects of soil redistribution upon water availability for vegetation (spatial extension 10 2[km 2], Chapter 6). The fifth step is the integration of landscape process modelling and changes in land use to evaluate on-site and off-site effects (spatial extension 10 [km 2], spatial resolution 25 [m], temporal extension 10 [a], temporal resolution 1 [a], Chapter 7). As a final step a synthesis of results, comments and evaluation of the research is done (Chapter 8).

Mots clés : landscape / land use / geology / sustainability / landscape ecology / models / land use planning / soil management / spain

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