公害ジャーナル

The Omo-gibe basin in Ethiopia's streamflow, seasonal distribution, and amount of precipitation were expected to be affected by climate change in this study. A quantile mapping approach were used to statistically downscale and bias-correct climate change projections made using data from fifteen regional climate models (RCMs) participating in the Coordinated Regional Climate Reduction Experiment (CORDEX)-Africa. Temperature and precipitation projections were made using the RCP 8.5 and RCP 4.5 emission scenarios. In the near future (2025-2050), medium future (2051-2075), and distant future (2076-2100), climate and streamflow estimates from a mean ensemble of RCMs were compared to the reference (1989–2019). To establish if a change is statistically significant and to identify trends in temperature, precipitation, and streamflow, Mann-Kendall (MK) trend testing was utilised. The hydrological SWAT (Soil and Water Assessment Tool) model was employed to project the effects of climate change on streamflow. The emission scenarios predicted significant positive (increasing) temperature changes but significant negative (declining) precipitation and streamflow changes, respectively, according to RCP4.5 and RCP8.5.

This led to the long-term poisoning of soils, waterways, aquatic biota, and crops. A leaching model based on first-order desorption kinetics called WISORCH was created and tested to evaluate the extent and duration of pollution according to soil type. Soil organic carbon content (SOC) and the SOC/water partitioning coefficient serve as its input parameters (Koc). It takes into account the concentrations of drainage water and chlordecone in the soil today. The fact that the model held true for andosol suggests that neither physico-chemical nor microbiological degradation took place. Soil scraping is unrealistic because of dilution from earlier deep tillages. The main method for reducing pollution seemed to be lixiviation. Along with an increase in SOC content and rainfall, Koc went from nitisol to ferralsol and then increased again.

A chemical or substance that is out of place, existing in the soil at a higher quantity than normal, and has negative effects on any organism that is not the target is referred to as "soil pollution." Soil pollution is a hidden threat since it is frequently difficult to gauge or see. One of the biggest soil concerns harming the world's soils and the ecosystem services they provide is soil pollution, according to the Status of the World's Soil Resources Report (SWSR). In every location, worries about soil pollution are expanding. In a recent resolution, the United Nations Environmental Assembly (UNEA-3) called for swifter action and increased cooperation to address and control soil pollution. This agreement, reached by more than 170 nations, demonstrates the significance of this issue on a global scale. Chemicals used in or created as a result of industrial processes, household, animal, and municipal wastes (including wastewater), agrochemicals, and petroleum-derived products are the main anthropogenic sources of soil pollution. Intentional releases of these chemicals into the environment include the use of fertilisers and pesticides, irrigation with untreated wastewater, and land application of sewage sludge. Accidental releases include oil spills and landfill leaching. In addition to incomplete combustion of various compounds, smelting, transportation, spray drift from pesticide applications, radionuclide deposition from air weapons testing, and nuclear accidents all contribute to soil pollution.