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A multi-sensor-based evaluation of the morphometric characteristics of Opa river basin in Southwest Nigeria

机译：基于多传感器基于多传感器的尼日利亚OPA河流域形态学特性评价

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Studies have shown that many river basins in the sub-Saharan Africa are largely unmonitored, partly because they are poorly or totally ungauged. In this study, remote sensing products (Landsat, Advanced Spaceborne Thermal Emission and Reflection Radiometer; ASTER and Shuttle Radar Topography Mission; SRTM) that are freely available in the region were harnessed for the monitoring of Opa river basin in southwestern Nigeria. The remote sensing products were complementarily used with topographical sheets (1:50,000), ground based observation and global positioning systems to determine selected morphometric characteristics as well as changes in landuse/landcover and its impact on peak runoff in the Opa river basin. Results showed that the basin is a 5(th) order basin whose land area has been subjected to different natural and anthropogenic influences within the study period. Urbanisation is a major factor that threatens the basin with degradation and observed changes, and the threats are expected to become worse if restoration is not considered from some tributaries. The study concluded that commentary use of available remote sensing products in the region will provide an important level of decision support information for management and monitoring of river basins.
机译：研究表明，撒哈拉以南非洲的许多河流盆地主要是不受监控的，部分原因是因为它们是不善或完全没有乞讨的。在本研究中，遥感产品（Landsat，高级星载热排放和反射辐射计;艾斯特和往返地形使命; SRTM）在该地区自由提供的，用于监测尼日利亚西南部的OPA河流域。遥感产品互补地与地形纸张（1：50,000），地面的观察和全球定位系统一起使用，以确定所选择的形态学特性以及土地使用/ Landcover的变化及其对OPA河流域峰值径流的影响。结果表明，该盆地是5（TH）级盆地，其土地面积在研究期内的不同自然和人为影响。城市化是威胁盆地的主要因素，威胁到堕落和观察到的变化，如果来自一些支流不考虑恢复，预计威胁会变得更糟。该研究得出结论，评注使用该地区可用的遥感产品将为河流盆地管理和监测提供重要决策支持信息。

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