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Spatial distribution and livelihood effects of debris cones at the western Afar Rift Valley margin, northern Ethiopia
Norsk Geografisk Tidsskrift-Norwegian Journal of Geography ( IF 1.977 ) Pub Date : 2020-05-28 , DOI: 10.1080/00291951.2020.1767684
Hailemariam Meaza 1, 2 , Belete Fentaye 3 , Tesfaalem Ghebreyohannes Asfaha 4 , Jean Poesen 5 , Amaury Frankl 6, 7 , Biadgilgn Demissie 8 , Amanuel Zenebe 9 , Veerle Van Eetvelde 10 , Zbelo Tesfamariam 2, 11 , Jozef Deckers 12 , Jan Nyssen 13
Affiliation  

The objective of the study on which the article is based was to investigate the distribution, characteristics and livelihood effects of debris cones in the Aba’ala and Raya grabens in Ethiopia. The characteristics of the debris cones and their upper catchment areas were obtained from Google Earth Pro and Landsat images. Questionnaires were used to understand the livelihood effects of the debris cones. In addition, transect studies, interviews and observations were used to supplement the data. The data were analysed using descriptive statistics, a regression model and coupled criteria. The results showed that the debris cones differed in their physical characteristics and distribution, and their volumes were larger in the Raya graben than in the Aba’ala graben. The average flow lengths of the upper catchments was the major predictor of debris cone volume. The expansion of debris cones devastated farmlands, resulting in crop yield loss. Moreover, deposited debris damaged dwellings and pasture, and led to smallholder farmers’ displacement. However, the cones remained attractive for settlement and spate irrigation. The authors conclude that despite the benefits of debris cones, catchment rehabilitation measures should be implemented in the upper catchments to reduce the expansion of debris cones in the studied grabens.



中文翻译:

埃塞俄比亚北部阿法尔纵谷西部边缘的碎屑锥的空间分布和生计效应

这篇文章所基于的研究目的是调查埃塞俄比亚阿巴阿拉和拉雅抓地的碎片锥的分布,特征和生计影响。从Google Earth Pro和Landsat图像中获得了碎片锥及其上流域的特征。问卷被用来了解碎片锥的生计影响。此外,还采用了断面研究,访谈和观察来补充数据。使用描述性统计数据,回归模型和耦合标准对数据进行了分析。结果表明,碎屑锥的物理特征和分布不同,并且在拉雅抓斗中的碎屑锥的体积比在阿巴阿拉抓斗中的碎屑锥的体积大。上流域的平均流长是碎屑锥体积的主要预测因子。碎片锥的扩张毁坏了农田,导致农作物减产。此外,堆积的残骸损坏了房屋和牧场,导致小农户流离失所。但是,这些圆锥体对于定居和大量灌溉仍然具有吸引力。作者得出的结论是,尽管有碎屑锥的好处,但仍应在上部集水区采取集水区恢复措施,以减少所研究grab沟中碎屑锥的膨胀。

更新日期:2020-06-23
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