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Changes of water chemistry from rainfall to stream flow in obagbile catchment, Southwest Nigeria

Regional Sustainability 2022年第2期3卷 170-181页

作者： Mojisola Hannah OMOGBEHIN Isaac Ayo OLUWATIMILEHIN Department of Geography Obafemi Awolowo UniversityIle Ife220101Nigeria

Water chemistry changes when it flows through different *** study aims to characterize the differences of water(including rainwater,overland flow,soil water,groundwater,and stream water)chemistry of five kinds of water in obagbile catchment in Southwest Nigeria,determine the changes in water chemistry that occur as the water moves from one pathway to another,and identify the factors responsible for the water chemistry *** do these,we collected 50 water samples from 10 heavy storms that received equal to or more than 10 mm of rain within an hour to test the changes of water chemical properties across various pathways in this *** results show that overland flow had the highest p H and electrical conductivity(EC)and rainwater had the lowest values of the two ***^(2+),Mg^(2+),Cl^(ˉ),and HCOO^(ˉ) were found to have their highest concentrations in stream water;meanwhile,NO_(3)^(–),NH_(4)^(+),and SO_(4)^(2–) were found to have almost the same low concentrations in all the water samples.K+was only dominant in stream water;while dissolved organic carbon(DOC)was lowest in rainwater,same in overland flow,soil water,and groundwater samples,and highest in stream *** component analysis(PCA)showed that for all the water samples from different pathways,two factors mainly accounted for the total *** two factors were related to the crustal and anthropogenic sources in rainwater,suggesting that the high loadings of major cations(e.g.,Ca^(2+) and Mg^(2+)) in rainwater samples are *** PCA for the overland flow and soil water showed strong correlations among pH,EC,and the concentrations of Na^(+),Mg^(2+),HCOO^(-),and CH_(3)COO^(-),while the high loadings of all the parameters and the strong correlations among each other were evident in the stream *** conclusion,the chemical constituents found in water are also the components of pathways through which the water *** major factors responsible for the change in the

关键词： Water chemistry Rainwater Overland flow Soil water obagbile catchment Principal component analysis

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