Morphologic Response of a River Channel to Sand Mining in River Tyaa, Kitui County, Kenya

Simple item page
dc.contributor.authorMuiruri, Philip Gathogo
dc.contributor.authorObando, Joy A.
dc.contributor.authorMahiri, Ishmail O.
dc.date.accessioned2023-04-11T09:30:52Z
dc.date.available2023-04-11T09:30:52Z
dc.date.issued2020
dc.descriptionArticleen_US
dc.description.abstractOver 40 billion tons of sand is mined worldwide every year which is estimated to be higher than the natural replacement rates. In Kenya, the rate of sand mining is raising concerns over its environmental effects since it is not regulated. This paper presents findings on the geomorphic effects of sand mining in the ephemeral River Tyaa channel in Kitui County. The study adopts the concept of feedback response mechanism of a natural geomorphic system. Through purposive sampling River Tyaa was selected for the study, where rampant sand mining was reportedly taking place. Random sampling on the five sand mining sites identified came up with a representative site namely Kanginga on which systematic sampling was applied while collecting data at both the active and control sites. Data on channel width, depth and slope angles was obtained through physical measurements while data on quantity of sand mined was obtained from Mwingi Sand Mining Cooperative. Multiple logistic regression analysis was used to analyse data whereby the model compared active and control sites. Test results indicated that sand mining had significantly increased river channel’s width (O.R. =1.531), depth (O.R. =1.527) and slope angles (O.R. =1.634) at active mining sites compared to control sites as deduced from the respective Odds Ratios. It concluded that sand mining had altered channel’s morphology resulting to adverse environmental effects such as loss of riparian vegetation and channel incision. It recommended curbing of illegal sand mining through licencing operators and reducing quantity of sand mined by closing some mines. Furthers, it recommended monitoring through regular Environmental Impact Assessment (E.I.A) and Audit (E.A) to inform protection of the river system from degrading.en_US
dc.identifier.citationMuiruri, P. G., Obando, J. A., & Mahiri, I. O. (2020). Morphologic response of a river channel to sand mining in river Tyaa, Kitui County, Kenya. Journal of Environmental & Earth Sciences, 2(2).en_US
dc.identifier.otherDOI: https://doi.org/10.30564/jees.v2i2.1935
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/25153
dc.language.isoesen_US
dc.publisherBPCen_US
dc.subjectChannel incisionen_US
dc.subjectEphemeral streamen_US
dc.subjectMorphologic responseen_US
dc.subjectSand miningen_US
dc.subjectSustainable developmenten_US
dc.titleMorphologic Response of a River Channel to Sand Mining in River Tyaa, Kitui County, Kenyaen_US
dc.typeArticleen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Morphologic Response of a River Channel to Sand Mining in River Tyaa, Kitui County, Kenya.pdf
Size:
1.72 MB
Format:
Adobe Portable Document Format
Description:
Full text Article
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
RP-Department of Geography