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University of Nairobi (2020)

Rainfall And Temperature Trends, Farming Patterns And Rainwater Harvesting Technologies In Kieni Sub-County

Maina, Jedidah W

Titre : Rainfall And Temperature Trends, Farming Patterns And Rainwater Harvesting Technologies In Kieni Sub-County

Auteur : Maina, Jedidah W

Université de soutenance : University of Nairobi

Grade : Master of Science in Environmental and Biosystems Engineering 2020

Résumé partiel
The study area was in Tigithi Sub-location of Kieni constituency in Nyeri County which is an Arid and Semi-Arid zone with unreliable rainfall and high temperatures. The area experiences a bimodal rainfall pattern. The study analysed seasonal average rainfall (1984-2013) and seasonal average maximum temperature (1983-2012) trends to detect the presence of climate change. To investigate changing farming patterns from 1987 to 2017, a sectional survey was conducted in 2017 in which 400 households participated. The percentage change detection in land use and land cover in the area was accomplished with the use of remote sensing and GIS. The study engaged the community in harvesting rain water which was used to grow Kale as supplemental irrigation whose results were compared to the same crop grown depending fully on the rains. Kale was grown in three seasons whereby each season produced a rain-fed and supplemental irrigated Kale. The growing of Kale involved farmer 1 and farmer 2 Analysis of seasonal average rainfall and average maximum temperature trends was calculated by the Mann-Kendall test together with Sen’s slope Estimator application using the MAKESENS template in Excel from the Finish Meteorological Institute. The March April May (MAM) rainfall season had positive average Mann-Kendall test value of 0.33 and positive Sen’s slope average value of 0.32 which was upward rainfall trend. The OND rainfall season had an average Mann-Kendall test value of -0.06 and an average Sen’s slope value of 0.02. The OND average rainfall results showed a decreasing rainfall trend. The highest mean rainfall for both seasons was experienced in April with over 115mm. The MAM and OND seasonal maximum temperature returned positive Man-Kendall test and Sen’s slope values. The average Mann-Kendal test for MAM season was 1.09 while the average Sen’s slope for the season was 0.016. The same tests for OND returned the values of 1.55 and 0.025 as the results for Mann-Kendall and Sen’s slope respectively. The MAM and OND average maximum temperature trend analysis showed an upward trend.

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