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Landuse, landcover change dynamics and flooding in the lower Niger basin Onitsha, South Eastern Nigeria
Land Use Policy ( IF 6.189 ) Pub Date : 2023-05-27 , DOI: 10.1016/j.landusepol.2023.106748
Ezebube M. Nkiruka , Ani D. Chinedu , Uchegbu N. Smart

This study looked at the factors contributing to Onitsha's incessant flooding, specifically landuse and land cover depletion. The landuse/landcover changes during a period of ten years (2008 – 2018) and the relevant variables were studied in the lower Niger Basin, focusing on Onitsha, Anambra State. Three sets of Enhanced Thematic Mapper Plus (ETM+) Landsat imagery maps from 2008, 2013, and 2018 were used to construct three Geographic Information Systems (GIS) based landuse/landcover maps of the research location and cross-tabulation method was adopted for the Change Detection analysis. The results demonstrated that between 2008 and 2013, built-up areas expanded by 9.4%, and between 2013 and 2018, they increased by 9.4%. Then it grew by 5.5%, resulting in a total area of 470 ha and 275 ha. Then, between 2008 and 2018, built-up added 745 ha in the study region, whereas vegetation lost 638 ha between 2008 and 2013, and another 97 ha between 2013 and 2018, for a total loss of 735 ha. Between 2008 and 2013, the area of bare ground increased by 1.3%, to 65 ha, while between 2013 and 2018, the area of bare ground decreased by 0.3%, to 15 ha. This study also discovered a 40-hectare rise in waterbody between 2008 and 2013 and a 100-hectare loss between 2013 and 2018. Based on the findings, the changes in landuse/landcover change detection provided insight into non-compliance with existing landuse acts and the implementation strategies of government agencies enforcing them.



中文翻译:

尼日尔盆地下游的土地利用、土地覆盖变化动态和洪水 尼日利亚东南部 Onitsha

这项研究着眼于导致 Onitsha 持续洪水泛滥的因素,特别是土地利用和土地覆盖枯竭。研究了尼日尔盆地下游十年(2008 年至 2018 年)的土地利用/土地覆盖变化和相关变量,重点是阿南布拉州奥尼查。使用 2008 年、2013 年和 2018 年的三套 Enhanced Thematic Mapper Plus (ETM+) Landsat 影像地图构建了三个基于地理信息系统 (GIS) 的研究地点土地利用/土地覆盖图,并采用交叉制表法进行变化检测分析。结果显示,2008 年至 2013 年间,建成区面积扩大了 9.4%,而 2013 年至 2018 年间,建成区面积增加了 9.4%。随后增长了5.5%,总面积分别为470公顷和275公顷。然后,在 2008 年到 2018 年间,研究区域的建成区增加了 745 公顷,而植被在 2008 年至 2013 年期间减少了 638 公顷,在 2013 年至 2018 年期间又减少了 97 公顷,总计减少了 735 公顷。2008 年至 2013 年间,裸地面积增加了 1.3%,达到 65 公顷,而 2013 年至 2018 年间,裸地面积减少了 0.3%,达到 15 公顷。这项研究还发现,2008 年至 2013 年期间水体增加了 40 公顷,2013 年至 2018 年期间水体减少了 100 公顷。根据调查结果,土地利用/土地覆盖变化检测的变化提供了对不遵守现有土地利用行为的洞察力和执行它们的政府机构的实施策略。裸地面积增加了 1.3%,达到 65 公顷,而 2013 年至 2018 年间,裸地面积减少了 0.3%,达到 15 公顷。这项研究还发现,2008 年至 2013 年期间水体增加了 40 公顷,2013 年至 2018 年期间水体减少了 100 公顷。根据调查结果,土地利用/土地覆盖变化检测的变化提供了对不遵守现有土地利用行为的洞察力和执行它们的政府机构的实施策略。裸地面积增加了 1.3%,达到 65 公顷,而 2013 年至 2018 年间,裸地面积减少了 0.3%,达到 15 公顷。这项研究还发现,2008 年至 2013 年期间水体增加了 40 公顷,2013 年至 2018 年期间水体减少了 100 公顷。根据调查结果,土地利用/土地覆盖变化检测的变化提供了对不遵守现有土地利用行为的洞察力和执行它们的政府机构的实施策略。

更新日期:2023-05-27
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