排序方式: 共有2条查询结果,搜索用时 0 毫秒
1
1.
Omo O. Omo-Irabor Samuel B. Olobaniyi Joe Akunna Valentijn Venus Joseph M. Maina Charles Paradzayi 《Environmental monitoring and assessment》2011,178(1-4):39-51
Mangroves are known for their global environmental and socioeconomic value. Despite their importance, mangrove like other ecosystems is now being threatened by natural and human-induced processes that damage them at alarming rates, thereby diminishing the limited number of existing mangrove vegetation. The development of a spatial vulnerability assessment model that takes into consideration environmental and socioeconomic criteria, in spatial and non-spatial formats has been attempted in this study. According to the model, 11 different input parameters are required in modelling mangrove vulnerability. These parameters and their effects on mangrove vulnerability were selected and weighted by experts in the related fields. Criteria identification and selection were mainly based on effects of environmental and socioeconomic changes associated with mangrove survival. The results obtained revealed the dominance of socioeconomic criteria such as population pressure and deforestation, with high vulnerability index of 0.75. The environmental criteria was broadly dispersed in the study area and represents vulnerability indices ranging from 0.00?C0.75. This category reflects the greater influence of pollutant input from oil wells and pipelines and minimal contribution from climatic factors. This project has integrated spatial management framework for mangrove vulnerability assessment that utilises information technology in conjunction with expert knowledge and multi-criteria analysis to aid planners and policy/ decision makers in the protection of this very fragile ecosystem. 相似文献
2.
Ejechi BO Olobaniyi SB Ogban FE Ugbe FC 《Environmental monitoring and assessment》2007,128(1-3):495-501
The physical (pH, Dissolved Solids, Dissolved Oxygen, conductivity, water depth temperature) and bacteriological (Total coliforms,
Faecal coliforms) characteristics of 22 hand-dug wells in oil-rich Niger Delta of Nigeria were investigated. All coliforms
counts (Log10 MPN/100 ml) varied from well to well ranging from 0 to 6.0 although faecal coliform counts were markedly lower (0–3.5 vs
1.0–6.0). When both seasons were compared, faecal coliform counts were significantly higher (t test; P < 0.05) during the wet season whereas no significant difference was observed in respect of total coliforms. Unlike the total
coliforms, faecal coliform counts increased in wells close to septic tanks during the wet season. Although a declining trend
was observed during the wet season, the values of the physical parameters were within WHO limits. The pH was slightly acidic
(Mean ± SD: dry season, 6.04 ± 0.66; wet, 6.43 ± 0.62) and may be attributed to emissions from gas flaring and petroleum refining
activities, which is common in the area. While the total coliform counts reflected the unsanitary habits of the well users,
the detection of faecal coliforms exceeding recommended numbers in 63% of the wells render them unfit for domestic use. The
public health implication is obvious considering the increasing number of people using the wells due to the rapid urbanization
of the oil-rich region. 相似文献
1