Acta Geographica Debrecina Landscape & Environment is a single blind peer-reviewed journal, with 2 issues per year. Our purpose is to publish the new results of landscape amd environmental studies.

Current Issue

Vol 13, No 1 (2019)

Published January 14, 2020



The study aimed to analyze the process of Landuse/Landcover change of two rural communes (SaéSaboua and Chadakori) of Maradi region (Republic of Niger) over the past 28 years (1986 – 2014),through landscape structure analysis by diachronic cartographic approach and landscape indices. Mixedclassification of temporal series of Landsat images led identifying six Landuse/Landcover (LULC)classes, namely ”cultivated land under shrubs and trees”, ”cultivated land under trees”, “continuouscropland”, ”fallow/pasture land”, ”forest reserve”, and ”settlement”. The composition and structure ofthe studied landscapes have greatly changed from 1986 to 2014. The class ”cultivated land under trees”was the landscape matrix in 1986 with 38.65% of landscape total area but in 2001 and 2014 the class”continuous cropland” became the landscape matrix. The changes also affected the ”forest reserve”which was transformed to smallholder agricultural land from 1986 to 2014. The area occupied byclasses ”cultivated land under trees” changed from 38.65% in 1986 to 8.78% in 2014; and from 1986to 2014, the area occupied by ”fallow/pasture land” has decreased of about 16%. The decrease in theseclasses was in favor of ¨continuous crop land¨, ¨settlement¨ and “cultivated land under shrubs and trees”which respectively gained 38%, 0.3% and 8.15% of their areas in 1986. The results of this study reflectthe problem of access to land and even land saturation in semi-arid region, a consequence of strongpopulation growth. They also contribute to a better rethinking of agricultural practices in order to initiateadaptation and resilience strategies for the population facing food insecurity and poverty.
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The development of point-bars and bank erosion are critical near-bank processes, as they indicatethe sediment and hydraulic regime of a river system, thus, they refer to the equilibrium conditions ofa channel. However, throughout history, rivers have been modified for various benefits which changethe development of point-bars and the rate of bank ...erosion. In the Lower Tisza River (Hungary), riverregulations influenced the channel and floodplain development, altering the natural fluvial processes.The aim of the research was to determine the rate of near-bank processes and to make trajectory forfuture river evolution to support future engineering works. The bank erosion and point-bar developmentat human-influenced and freely meandering sections of the Tisza River were monitored since 2011.Behind a collapsed revetment, the bank erosion rate was 0.6 m/y, while at a freely meandering section itwas 2.3 m/y. The studied point-bars are located in revetted and freely meandering sections. Their surfaceeroded within the period. These intensive erosional processes refer to an incising meandering channel,which must be considered during future planning of in-channel structures (e.g. revetments, bridges),thus, geomorphic methods must be considered in any river engineering scheme.
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