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首页> 外文期刊>Lakes & Reservoirs >Analysing the extent (size and shape) of Lake Basaka expansion (Main Ethiopian Rift Valley) using remote sensing and GIS
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Analysing the extent (size and shape) of Lake Basaka expansion (Main Ethiopian Rift Valley) using remote sensing and GIS

机译：使用遥感和GIS分析Basaka湖扩张（埃塞俄比亚主要裂谷）的程度（大小和形状）

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This study attempted to estimate the extent of the expansion of the area of Lake Basaka over the past 50 years (1960 to 2010), using LANDSAT images, field observations, local information and topographic maps. The analysis revealed that the lake has exhibited a dramatic expansion over the past five decades. An increase in the lake water level by 7.6 m over this period resulted in flooding about 45.8 km2 of surrounding areas and an incremental lake volume of about 280 Mm3. About 70% of the lake expansion was observed in the period between the 1970s and 1990s. This phenomenon coincides with the periods of remarkable land use/cover changes in the region. Furthermore, the beginning of the lake expansion coincided with the introduction of irrigated agriculture in the region, and construction of Koka Dam in the mid-1960s in the upper Awash River Basin. This study suggests that the observed expansion trend, if it continues unabated, could result in certain socio-economic and environmental consequences in the region in particular, and to Ethiopia in general. Groundwater inundation or salty water intrusion, for example, might occur in the area in the near future, thereby affecting the sustainability of regional irrigated agriculture. The lake has the potential to inundate the surrounding region (Matahara Sugar Estate; towns of Fantalle and Matahara) and might connect with the Awash River during the next 10-15 years. This would affect downstream irrigation developments in the Awash Basin and the livelihoods of people that depend on the basin's water resources. The overall findings of this study emphasize the need to adopt mitigation measures before the lake expansion results in irreversible damage to the region or the basin.
机译：这项研究试图使用LANDSAT图像，野外观测，当地信息和地形图来估计过去50年（1960年至2010年）巴萨卡湖面积的扩大程度。分析表明，在过去的五十年中，该湖呈现出戏剧性的扩张。在此期间，湖水位上升了7.6 m，导致周围地区洪水泛滥，面积约为45.8 km2，湖水增量约为280 Mm3。在1970年代至1990年代期间，约有70％的湖泊扩张。这种现象与该地区土地利用/覆盖变化显着时期相吻合。此外，湖泊扩张的开始恰逢该地区引入灌溉农业，并在1960年代中期在阿瓦什河上游流域兴建了Koka大坝。这项研究表明，所观察到的扩张趋势，如果继续保持下去，可能会对该地区乃至整个埃塞俄比亚造成某些社会经济和环境后果。例如，在不久的将来该地区可能会发生地下水泛滥或咸水入侵，从而影响区域灌溉农业的可持续性。该湖有可能淹没周围地区（Matahara Sugar Estate； Fantalle和Matahara镇），并可能在未来10-15年内与阿瓦什河相连。这将影响阿瓦什盆地的下游灌溉发展以及依赖该盆地水资源的人们的生计。这项研究的总体结果强调，在湖泊扩张导致对该地区或盆地不可逆转的破坏之前，必须采取缓解措施。

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