Evaluation of surface water dynamics for water-food security in seasonal wetlands, north-central Namibia

Tetsuya Hiyama, Tetsuji Suzuki, Miho Hanamura, Hiroki Mizuochi, Jack R. Kambatuku, Johanna N. Niipele, Yuichiro Fujioka, Takeshi Ohta, Morio Iijima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Agricultural use of wetlands is important for food security in various regions. However, land-use changes in wetland areas could alter the water cycle and the ecosystem. To conserve the water environments of wetlands, care is needed when introducing new cropping systems. This study is the first attempt to evaluate the water dynamics in the case of the introduction of rice-millet mixed-cropping systems to the Cuvelai system seasonal wetlands (CSSWs) in north-central Namibia. We first investigated seasonal changes in surface water coverage by using satellite remote sensing data. We also assessed the effect of the introduction of rice-millet mixed-cropping systems on é vapotranspiration in the CSSWs region. For the former investigation, we used MODIS and AMSR-E satellite remote sensing data. These data showed that at the beginning of the wet season, surface water appears from the southern (lower) part and then expands to the northern (higher) part of the CSSWs. For the latter investigation, we used data obtained by the classical Bowen ratio-energy balance (BREB) method at an experimental field site established in September 2012 on the Ogongo campus, University of Namibia. This analysis showed the importance of water and vegetation conditions when introducing mixed-cropping to the region.Grant: Acknowledgements: This study was supported by an international research/development (R/D) project of the Science and Technology Research Partnership for Sustainable Development (SATREPS) entitled "Flood- and drought-adaptive cropping systems to conserve water environments in semi-arid regions" (P.I.: M. Iijima). We thank the Japan Science and Technology Agency (JST) and the Japan International Cooperation Agency (JICA) for their kind coordination. We also thank all members of the Faculty of Agriculture and Natural Resources, University of Namibia (UNAM), for kindly collaborating with our research.

Original languageEnglish
Title of host publicationEvolving Water Resources Systems
Subtitle of host publicationUnderstanding, Predicting and Managing Water-Society Interactions - Proceedings of ICWRS 2014
PublisherIAHS Press
Pages380-385
Number of pages6
ISBN (Print)9781907161421
DOIs
Publication statusPublished - 2014
EventBologna IAHS 2014 - 6th IAHS-EGU International Symposium on Integrated Water Resources Management - Bologna, Italy
Duration: 2014 Jun 42014 Jun 6

Publication series

NameIAHS-AISH Proceedings and Reports
Volume364
ISSN (Print)0144-7815

Other

OtherBologna IAHS 2014 - 6th IAHS-EGU International Symposium on Integrated Water Resources Management
CountryItaly
CityBologna
Period14/6/414/6/6

Keywords

  • Bowen ratio-energy balance (BREB) method
  • Cuvelai system seasonal wetlands (CSSWs)
  • Flood- and drought-adaptive cropping system (FDACS)
  • Water environments

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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    Hiyama, T., Suzuki, T., Hanamura, M., Mizuochi, H., Kambatuku, J. R., Niipele, J. N., Fujioka, Y., Ohta, T., & Iijima, M. (2014). Evaluation of surface water dynamics for water-food security in seasonal wetlands, north-central Namibia. In Evolving Water Resources Systems: Understanding, Predicting and Managing Water-Society Interactions - Proceedings of ICWRS 2014 (pp. 380-385). (IAHS-AISH Proceedings and Reports; Vol. 364). IAHS Press. https://doi.org/10.5194/piahs-364-380-2014