anthropogenic influence; Geographic information system; land cover mapping; landscape; land cover change; tropical Africa
Abstract :
[en] In order to understand the dynamic of the (sub)urbanisation and so, to quantify the anthropogenic effects of the rapid growth of tropical cities, it is crucial to find and apply valuable methods. In this contribution, the transferability of the Rüdisser et al. (2012) «Distance to Nature» hemeroby assessment method to the landscape surrounding the city of Lubumbashi (DRC) is evaluated. That methodology has the advantage of taking structural connectivity into account by computing the distance to natural habitats. As it had never been applied to an African city before, some adjustments (fitting of the local land uses types into the hemeroby levels designed to Austria) and amendments (suppression of the final classification into hemeroby level simplification) are proposed. Moreover, an analysis of the decanal (2002-2013) hemeroby dynamics is presented. Results suggest that the Distance to Nature methodology is transferable but requires good field knowledge to define reference habitats and identify them in the Landsat classified images. There was a dramatic decrease of the «natural» and «near-natural» levels in the study extent during the studied period. In addition, 32% of the land underwent anthropisation increase, mostly around cities and following a ribbon development. [fr] Dans un contexte de croissance rapide, souvent non planifiée, des villes tropicales, il est crucial d’appliquer les méthodes les plus adéquates permettant de comprendre la dynamique de (péri)urbanisation et, ainsi, de quantifier l’anthropisation de ces villes. Dans cette étude, la transférabilité de la méthodologie d’estimation de l’hémérobie « Distance to Nature » de Rüdisser et al. (2012) est évaluée via son application au paysage entourant la ville de Lubumbashi (RDC). Cette méthode a l’avantage de prendre la connectivité structurelle en compte via le calcul de la distance aux habitats naturels. La méthodologie n’ayant encore jamais été appliquée au contexte d’une ville africaine, certains ajustements (mise en correspondance des utilisations du sol locales avec les niveaux d’hémérobie mis au point en Autriche) et amendements (suppression de la simplification finale de la classification en niveaux d’hémérobie) sont proposés. De plus, une analyse de la dynamique décennale (2002-2013) d’hémérobie est présentée. Les résultats suggèrent que la méthodologie « Distance to Nature » est transférable mais que la définition des habitats de référence ainsi que leur identification sur les images Landsat classifiées requièrent une excellente connaissance du terrain. Durant cette période et sur l’étendue d’étude, les niveaux « naturel » et « proche de naturel » ont considérablement diminué. De plus, 32% du territoire ont vu leur anthropisation augmenter, principalement autour des villes et suivant un développement en ruban.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Andre, Marie ; Université de Liège > Ingénierie des biosystèmes (Biose) > Biodiversité et Paysage
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.