Sediment yield variability in central Tunisia: a quantitative analysis of its controlling factors

Autor: Imen Ayadi, Habib Abida, M. Raouf Mahjoub, Yassin Djebbar
Rok vydání: 2010
Předmět:
Zdroj: Hydrological Sciences Journal. 55:446-458
ISSN: 2150-3435
0262-6667
DOI: 10.1080/02626661003741526
Popis: This paper refers to the quantification and prediction of the sedimentation rate of 26 hillside-dam reservoirs in Central Tunisia. The objectives of the study are to develop a simple and practical methodology to identify controlling factors of sedimentation, and to propose a regionalization from the study sites. Principal component analysis (PCA) and complementary multi-dimensional statistical methods are used to relate highly variable area-specific sediment yield to hydro-morphometric, lithological, geomorphological and anthropogenic characteristics of catchments. It appears that catchment area is not the main controlling factor of sedimentation in the studied area. The overall slope index, drainage network characteristics and runoff parameters are also important in characterizing sediment yield. Applied to the annual sedimentation rate series, PCA resulted in retaining the first three principal axes, explaining 65% of the total variance. Statistical methods showed that the overall slope index, ...
Databáze: OpenAIRE
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