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Environmental modeling study of water adequacy and yield from an irrigated rice field in Mali.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A process oriented modeling of an irrigated rice field in a semi arid area of Mali has been done with the help of computational tool CoupModel. The model has been used to simulate two levels of irrigation rates, in an attempt to test and see adequacy of a recommended irrigation rate and its environmental impact over the current management. A simpler simulation to represent less water demanding crops like sorghum or millet has also been done to indicate extent of the excess water and as alternative crop cultivation. Important processes and parameters to represent a rice cropping system have been identified and simulation was run for a 12 year period. Results show an irrigation amount of 916 mm delivers an overall 6 % increased yield. Results from the reduced irrigation also show a better output in surface runoff, nitrogen leaching and uptake, photosynthetic water use efficiency and fertilizer efficiency. Soil nitrogen and carbon storage shows nearly the same trend. Only nitrous oxide (N2O) emission rate increased by 13 % in the case of reduced irrigation. Simulation done for the other crops also shows a reasonable yield of sorghum or millet can be obtained with 46 % of water used for current rice irrigation.

Place, publisher, year, edition, pages
2015.
Series
TRITA-LWR Degree Project, 2015:02
Keyword [en]
CoupModel, Yield, Irrigation rate, Evapotranspiration, Runoff, Nitrogen uptake and leaching
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-170064OAI: oai:DiVA.org:kth-170064DiVA: diva2:827027
Educational program
Degree of Master - Water System Technology
Supervisors
Available from: 2015-09-21 Created: 2015-06-26 Last updated: 2015-09-21Bibliographically approved

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CiteExportLink to record
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  • apa
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