Abstract Cross River, which originates from Cameroon, flows through several communities in Nigeria. The population upsurge and settlements near the river channel, however, portends the possibility of natural hazards such as floods. Floods within the upper Cross River basin (UCRB) have resulted in the loss of lives and property. The importance of flood studies, therefore, cannot be overemphasized. This study evaluated the influence of sub-basins on the flooding of the main channel in the UCRB using morphometric analysis. The UCRB was delineated into sub-basins using Shuttle Radar Topographic Mission Digital Elevation Model. The drainage network and morphometric parameters were extracted using QSWAT installed as a plugin in QGIS. Based on the compound factors computed from morphometric parameters that directly impact runoff, the UCRB was categorized into three flood vulnerability zones namely: high vulnerability (10.93–13.10), moderate vulnerability (8.75–10.92), and low vulnerability (6.57–8.74). The analysis revealed that sub-basins 18, 10, 8, 17, 1, 6, 15, and 13 have greater potentials to attain peak discharge in a short period, therefore, the instantaneous high runoff contribution of their tributaries to Cross River. The results of this study provide useful information for the effective mitigation and management of the flood vulnerabilities of the UCRB.

中文翻译：

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使用形态计量学分析评估上克罗斯河流域的洪水脆弱性

摘要克罗斯河发源于喀麦隆，流经尼日利亚多个社区。然而，河道附近的人口激增和定居点预示着洪水等自然灾害的可能性。克罗斯河流域上游 (UCRB) 内的洪水已造成生命和财产损失。因此，洪水研究的重要性怎么强调都不为过。本研究使用形态测量分析评估了子流域对 UCRB 主河道洪水的影响。使用航天飞机雷达地形任务数字高程模型将 UCRB 划分为子流域。排水网络和形态参数是使用作为 QGIS 插件安装的 QSWAT 提取的。基于从直接影响径流的形态测量参数计算的复合因子，UCRB 分为三个洪水脆弱区，即：高脆弱性（10.93-13.10）、中等脆弱性（8.75-10.92）和低脆弱性（6.57-8.74）。分析表明，18、10、8、17、1、6、15、13子流域在短时间内达到高峰流量的潜力较大，因此其支流对克罗斯河的瞬时径流贡献较大。这项研究的结果为有效缓解和管理 UCRB 的洪水脆弱性提供了有用的信息。其支流对克罗斯河的瞬时高径流贡献。这项研究的结果为有效缓解和管理 UCRB 的洪水脆弱性提供了有用的信息。其支流对克罗斯河的瞬时高径流贡献。这项研究的结果为有效缓解和管理 UCRB 的洪水脆弱性提供了有用的信息。