Abstract
The impact of human activities on sensitive watershed terrains is a critical consideration in the management of urban ecosystems. Degradation of sensitive ecosystem features such as watershed land areas is often irreversible due to the extent and intensity. The vulnerability of 150 m watershed management zone of Otamiri river Owerri Imo State, Nigeria was studied by topographic analysis using 1977 digital elevation model (DEM), 1977 aerial photos, Shuttle Radar Topographic Mission DEM of 2000, 2012 satellite imagery and the 2016 Master Plan of the study area. The impact of human activities in elevation change was observed in the parts of substantial human activities while topographical stability was recorded for areas of very low human activities.
Highlights
Urban ecosystem is a dynamic complex ecosystem with physical, biological and social components that interact and behave as a functional unit in any environment
The impact of human activities on sensitive watershed terrains is a critical consideration in the management of urban ecosystems
The vulnerability of 150 m watershed management zone of Otamiri river Owerri Imo State, Nigeria was studied by topographic analysis using 1977 digital elevation model (DEM), 1977 aerial photos, Shuttle Radar Topographic Mission DEM of 2000, 2012 satellite imagery and the 2016 Master Plan of the study area
Summary
Urban ecosystem is a dynamic complex ecosystem with physical, biological and social components that interact and behave as a functional unit in any environment. Urban ecosystems are important because they provide services such as provisioning, regulating, supporting and cultural at various scales and forms. These services are recognized in any given watershed area. The problem posed by the growing demand for ecosystem services is compounded by the increasingly serious degradation in the capability of ecosystems to provide these services Some of these impacts of these degradations may be irreversible as the case of biodiversity loss and soil degradation [2]. This ever-growing demands being placed on increasingly degraded ecosystems seriously diminishes the prospects for sustainable development
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