This study aims at assessing how riparian zones have been altered through various land use activities and the implications of its capacity to mitigate flood. The study focused mainly on examining the land use/land cover changes within the riparian zone over a period of 20 years. The vulnerability of the riparian zone to flood were analyzed using remote sensing datasets. Flood vulnerability models were created based on the elevation and land cover type. A Euclidean distance (700 m) was created using the shuttle radar topographical mapping (SRTM) digital elevation model (DEM) of the lake and its riparian zone. The flood attenuation (150 m buffer) and riparian habitat (500 m) zones (areas) within the riparian zone of the lake were then created using the extracted lake boundary. Landsat 7 (for 1999) and 8 (for 2019) covering both zones were classified using the Maximum Likelihood Classification method. The results revealed that the built-up area increased from 2.04 to 4.54 km 2 between 1999 and 2019 while water body, grassland, and forest decreased from 0.05 to 0.04 km 2 , 0.37 to 0.12 km 2 and 1.84 to 1.82 km 2 over the period of the study. The results further show that about 18.9% of built-up areas were within the very high vulnerability zone of flood as of the year 2019. The results reveal that the riparian area cover is declining in the study area, despite its ecological services in reducing the effect of floods by slowing down runoff, trapping sediments and enhancing infiltration. The pattern of distribution of the land cover classes at different flood vulnerability levels within zones indicates that the more the alteration of both zones’ landscape, the more vulnerable they are to flood. The study concluded that there is a significant level of structural change of the riparian zone which increases its vulnerability level to flooding.

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评估尼日利亚伊巴丹 Eleyele 地区的河岸带动态及其与洪水相关的影响

本研究旨在评估河岸带是如何通过各种土地利用活动而改变的，以及其减轻洪水的能力的影响。该研究主要侧重于检查 20 年来河岸带内的土地利用/土地覆盖变化。使用遥感数据集分析了河岸区对洪水的脆弱性。洪水脆弱性模型是根据高程和土地覆盖类型创建的。欧几里得距离 (700 m) 是使用湖泊及其河岸带的穿梭雷达地形图 (SRTM) 数字高程模型 (DEM) 创建的。然后使用提取的湖泊边界创建湖泊河岸带内的洪水衰减（150 m 缓冲区）和河岸栖息地（500 m）带（区域）。Landsat 7（1999 年）和 8（2019 年）覆盖这两个区域，使用最大似然分类方法进行分类。结果表明，1999-2019年建成区面积由2.04增至4.54 km 2 ，水体、草地和森林面积分别由0.05至0.04 km 2 、0.37至0.12 km 2 和1.84至1.82 km 2 减少。的研究。结果进一步表明，截至 2019 年，约 18.9% 的建成区位于洪水的非常高的脆弱区。 结果表明，研究区的河岸覆盖率正在下降，尽管其生态服务减少了洪水通过减缓径流、截留沉积物和增强渗透而产生的影响。区域内不同洪水脆弱性级别的土地覆盖等级分布格局表明，两个区域的景观变化越大，它们就越容易受到洪水的影响。研究得出的结论是，河岸区的结构发生了显着变化，从而增加了其对洪水的脆弱性。